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根據(jù)磁感應(yīng)強度的定義式B=
，下列說法中正確的是
A．在磁場中某確定位置，B與F成正比，與I、L的乘積成反比
B．一小段通電直導(dǎo)線在空間某處受磁場力F=0，那么該處的B一定為零
C．磁場中某處的B的方向跟電流在該處受磁場力F的方向相同
D．一小段通電直導(dǎo)線放在B為零的位置，那么它受到磁場力F也一定為零
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分享到<ul><li>QQ空間</li><li>新浪微博</li><li>百度搜藏</li><li>人人網(wǎng)</li><li>騰訊微博</li><li>開心網(wǎng)</li><li>騰訊朋友</li><li>百度空間</li><li>豆瓣網(wǎng)</li><li>搜狐微博</li><li>MSN</li><li>QQ收藏</li><li>我的淘寶</li><li>百度貼吧</li><li>搜狐白社會</li><li>更多...</li></ul><p>百度分享</p><p>一個有一定厚度的圓盤，可以繞通過中心垂直于盤面的水平軸轉(zhuǎn)動，用下面的方法測量它勻速轉(zhuǎn)動時的角速度。</p><p>實驗器材：電磁打點計時器、米尺、紙帶、復(fù)寫紙片。</p><p>實驗步驟：</p><p>（1）如圖1所示，將電磁打點計時器固定在桌面上，將紙帶的一端穿過打點計時器的限位孔后，固定在待測圓盤的側(cè)面上，使得圓盤轉(zhuǎn)動時，紙帶可以卷在圓盤側(cè)面上。</p><p>（2）啟動控制裝置使圓盤轉(zhuǎn)動，同時接通電源，打點計時器開始打點。</p><p>（3）經(jīng)過一段時間，停止轉(zhuǎn)動和打點，取下紙帶，進行測量。</p><p>① 由已知量和測得量表示的角速度的表達式為<i>ω=</i><u> </u>。式中各量的意義是：<u> </u></p><p><u> </u>.</p><p>② 某次實驗測得圓盤半徑<i>r=</i>5.50×10<sup>-2</sup>m，得到紙帶的一段如圖2所示，求得角速度為<u> </u>。</p><table height="95" cellspacing="0" cellpadding="0" width="584" align="left" vspace="0" hspace="0"><tr><td style="PADDING-RIGHT: 9pt; PADDING-LEFT: 9pt; PADDING-BOTTOM: 0cm; PADDING-TOP: 0cm" valign="top" align="left" height="95"><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image062.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image063.gif" width="0" /></p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image064.gif" width="0" /> </p><br clear="all" /><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306394" onclick="function anonymous(){current_test_id ='daan-306394';}" type="submit" /> <p>（1）<sub><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image065.gif" width="0" /></sub>，<i>T</i>為電磁打點計時器打點的時間間隔，<i>r</i>為圓盤的半徑，<i>x</i><sub>2</sub>、<i>x</i><sub>1</sub>是紙帶上選定的兩點分別對應(yīng)的米尺的刻度值，<i>n</i>為選定的兩點間的打點數(shù)（含兩點）。</p><p>（2）6.8/s。</p><p></p><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306393" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306393';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306393" onclick="function anonymous(){current_test_id ='shiti-306393';}" type="submit" /> <br /><input class="but" id="test-306393" onclick="function anonymous(){ checkpass(this,'306393','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306393" onclick="function anonymous(){ checkpass(this,'306393','1');return false;location.reload();}" type="submit" /> <p>一個實驗小組在“探究彈力和彈簧伸長的關(guān)系”的實驗中，使用兩根不同的輕質(zhì)彈簧<i>a</i>和<i>b</i>，得到彈力與彈簧長度的圖象如圖所示。下列表述正確的是 （ ）</p><p>A．<i>a</i>的原長比<i>b</i>的長</p><p> B．<i>a</i>的勁度系數(shù)比<i>b</i>的大</p><p> C．<i>a</i>的勁度系數(shù)比<i>b</i>的小</p><p>D．測得的彈力與彈簧的長度成正比</p><p><img height="0" hspace="12" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image061.gif" width="0" align="left" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306393" onclick="function anonymous(){current_test_id ='daan-306393';}" type="submit" /> <p> B</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306392" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306392';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306392" onclick="function anonymous(){current_test_id ='shiti-306392';}" type="submit" /> <br /><input class="but" id="test-306392" onclick="function anonymous(){ checkpass(this,'306392','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306392" onclick="function anonymous(){ checkpass(this,'306392','1');return false;location.reload();}" type="submit" /> <p>在“驗證力的平行四邊形定則”實驗中，需要將橡皮條的一端固定在水平木板上，另一端系上兩根細(xì)繩，細(xì)繩的另一端都有繩套(如圖)。實驗中需用兩個彈簧秤分別勾住繩套，并互成角度地拉橡皮條。某同學(xué)認(rèn)為在此過程中必須注意以下幾項：</p><p>A. 兩根細(xì)繩必須等長。</p><p>B．橡皮條應(yīng)與兩繩夾角的平分線在同一直線上。</p><p>C. 在使用彈簧秤時要注意使彈簧秤與木板平面平行。</p><p>其中正確的是<u> </u>。(填入相應(yīng)的字母) </p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image060.gif" width="0" /> </p><br clear="all" /><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306392" onclick="function anonymous(){current_test_id ='daan-306392';}" type="submit" /> <p> C</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306391" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306391';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306391" onclick="function anonymous(){current_test_id ='shiti-306391';}" type="submit" /> <br /><input class="but" id="test-306391" onclick="function anonymous(){ checkpass(this,'306391','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306391" onclick="function anonymous(){ checkpass(this,'306391','1');return false;location.reload();}" type="submit" /> <p>在做“驗證機械能守恒定律”實驗時，用打點計時器打出紙帶如圖所示，其中<i>A</i>點為打下的第一個點，0、1、2……為連續(xù)的相鄰計數(shù)點。現(xiàn)測得兩相鄰計數(shù)點之間的距離分別為<i>s</i><sub>1</sub>、<i>s</i><sub>2</sub>、<i>s</i><sub>3</sub>、<i>s</i><sub>4</sub>、<i>s</i><sub>5</sub>、<i>s</i><sub>6</sub>，已知計數(shù)點間的時間間隔為<i>T</i>。根據(jù)紙帶測量出的數(shù)據(jù)可以求出此實驗過程中重錘下落運動的加速度大小的表達式為<u> </u>，打下第5號計數(shù)點時，紙帶運動的瞬時速度大小的表達式為<u> </u>。要驗證機械能守恒定律，為減小實驗誤差，應(yīng)選擇打下第<u> </u>號和第<u> </u>號計數(shù)點之間的過程為研究對象。</p><p><table cellspacing="0" cellpadding="0" align="left"><tr><td width="13" height="12"></td></tr><tr><td></td><td><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image056.gif" width="0" /></td></tr></table> </p><br clear="all" /><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306391" onclick="function anonymous(){current_test_id ='daan-306391';}" type="submit" /> <p><sub><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image057.gif" width="0" /></sub>或<sub><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image058.gif" width="0" /></sub>……；（<i>s</i><sub>5</sub>+<i>s</i><sub>6</sub>）/2<i>T</i>；1，5</p><table height="246" cellspacing="0" cellpadding="0" width="215" align="left" vspace="0" hspace="0"><tr><td style="PADDING-RIGHT: 9pt; PADDING-LEFT: 9pt; PADDING-BOTTOM: 0cm; PADDING-TOP: 0cm" valign="top" align="left" height="246"><p><table cellspacing="0" cellpadding="0"><tr><td style="VERTICAL-ALIGN: top" width="40" height="35"><table cellspacing="0" cellpadding="0" width="100%"><tr><td><p>乙</p></td></tr></table> </td></tr></table><table cellspacing="0" cellpadding="0"><tr><td style="VERTICAL-ALIGN: top" width="40" height="35"><table cellspacing="0" cellpadding="0" width="100%"><tr><td><p>甲</p></td></tr></table> </td></tr></table> </p></td></tr></table><p> </p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306390" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306390';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306390" onclick="function anonymous(){current_test_id ='shiti-306390';}" type="submit" /> <br /><input class="but" id="test-306390" onclick="function anonymous(){ checkpass(this,'306390','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306390" onclick="function anonymous(){ checkpass(this,'306390','1');return false;location.reload();}" type="submit" /> <p>如圖4所示為某同學(xué)用多用電表歐姆檔測量一個電阻阻值的示數(shù)和檔位情況，則這個電阻的阻值約為<u> </u>Ω。如果想測量的更精確些，應(yīng)怎樣調(diào)節(jié)多用電表后再進行測量？答：<u> </u></p><p><u> </u>。</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image055.gif" width="0" align="left" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306390" onclick="function anonymous(){current_test_id ='daan-306390';}" type="submit" /> <p>答案：2.0×10<sup>2</sup>，換用×10Ω檔并調(diào)零</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306389" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306389';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306389" onclick="function anonymous(){current_test_id ='shiti-306389';}" type="submit" /> <br /><input class="but" id="test-306389" onclick="function anonymous(){ checkpass(this,'306389','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306389" onclick="function anonymous(){ checkpass(this,'306389','1');return false;location.reload();}" type="submit" /> <p>下圖為一正在測量中的多用電表表盤。</p><p>（1）如果是用直流10V檔測量電壓，則讀數(shù)為<u> </u>V。（2）如果是用×100Ω檔測量電阻，則讀數(shù)為<u> </u>Ω。（3）如果是用直流5mA檔測量電流，則讀數(shù)為<u> </u>mA。</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image054.gif" width="0" align="left" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306389" onclick="function anonymous(){current_test_id ='daan-306389';}" type="submit" /> <p>6.5；8.0×10<sup>2</sup>；3.25</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306388" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306388';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306388" onclick="function anonymous(){current_test_id ='shiti-306388';}" type="submit" /> <br /><input class="but" id="test-306388" onclick="function anonymous(){ checkpass(this,'306388','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306388" onclick="function anonymous(){ checkpass(this,'306388','1');return false;location.reload();}" type="submit" /> <p>已知太陽到地球與地球到月球的距離的比值約為390，月球繞地球旋轉(zhuǎn)的周期約為27天。利用上述數(shù)據(jù)以及日常的天文知識，可估算出太陽對月球與地球?qū)υ虑虻娜f有引力的比值約為（ ）</p><p>A．0.2 B．2 C．20 D．200</p><p> </p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306388" onclick="function anonymous(){current_test_id ='daan-306388';}" type="submit" /> <p>B </p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306387" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306387';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306387" onclick="function anonymous(){current_test_id ='shiti-306387';}" type="submit" /> <br /><input class="but" id="test-306387" onclick="function anonymous(){ checkpass(this,'306387','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306387" onclick="function anonymous(){ checkpass(this,'306387','1');return false;location.reload();}" type="submit" /> <p>土星周圍有美麗壯觀的“光環(huán)”，組成環(huán)的顆粒是大小不等、線度從1μm到10m的巖石、塵埃，類似于衛(wèi)星，它們與土星中心的距離從7.3×10<sup>4</sup>km延伸到1.4×10<sup>5</sup>km。已知環(huán)的外緣顆粒繞土星做圓周運動的周期約為14h，引力常量為6.67×10<sup>-11</sup>N?m<sup>2</sup>/kg<sup>2</sup>，則土星的質(zhì)量約為（估算時不考慮環(huán)中顆粒間的相互作用） （ ）</p><p>A．9.0×10<sup>16</sup>kg B．6.4×10<sup>17</sup>kg C．9.0×10<sup>25</sup>kg D．6.4×10<sup>26</sup>kg</p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306387" onclick="function anonymous(){current_test_id ='daan-306387';}" type="submit" /> <p>D </p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306386" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306386';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306386" onclick="function anonymous(){current_test_id ='shiti-306386';}" type="submit" /> <br /><input class="but" id="test-306386" onclick="function anonymous(){ checkpass(this,'306386','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306386" onclick="function anonymous(){ checkpass(this,'306386','1');return false;location.reload();}" type="submit" /> <p>在中子衍射技術(shù)中，常利用熱中子研究晶體的結(jié)構(gòu)，因為熱中子的德布羅意波長與晶體中原子間距相近。已知中子質(zhì)量<i>m</i>=1.67×10<sup>-27</sup>kg，普朗克常量<i>h</i>=6.63×10<sup>-34</sup>J·s，可以估算德布羅意波長<i>λ</i>=1.82×10<sup>-10</sup>m的熱中子動能的數(shù)量級為 （ ）</p><p>(A)10<sup>-17</sup>J (B)10<sup>-19</sup>J (C)10<sup>-21</sup>J (D)10<sup>-24</sup> J</p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306386" onclick="function anonymous(){current_test_id ='daan-306386';}" type="submit" /> <p> C </p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306385" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306385';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306385" onclick="function anonymous(){current_test_id ='shiti-306385';}" type="submit" /> <br /><input class="but" id="test-306385" onclick="function anonymous(){ checkpass(this,'306385','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306385" onclick="function anonymous(){ checkpass(this,'306385','1');return false;location.reload();}" type="submit" /> <p>人眼對綠光最為敏感。正常人的眼睛接收到波長為530nm的綠光時，只要每秒有6個綠光的光子射入瞳孔，眼睛就能察覺。普朗克常量為6.63×10<sup>-34</sup>J×s，光速為3.0×10<sup>8</sup>m/s，則人眼能察覺到綠光時所接收到的最小功率是 </p><p>A. 2.3×10<sup>-18</sup>W B. 3.8×10<sup>-19</sup>W</p><p>C. 7.0×10<sup>-48</sup>W D.1.2×10<sup>-48</sup>W</p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306385" onclick="function anonymous(){current_test_id ='daan-306385';}" type="submit" /> <p>A </p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306384" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306384';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306384" onclick="function anonymous(){current_test_id ='shiti-306384';}" type="submit" /> <br /><input class="but" id="test-306384" onclick="function anonymous(){ checkpass(this,'306384','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306384" onclick="function anonymous(){ checkpass(this,'306384','1');return false;location.reload();}" type="submit" /> <p>在如圖所示的四個圖象中，能夠正確反映一種元素的同位素原子核的質(zhì)量數(shù)<i>M</i>與其中子數(shù)<i>N</i>之間的關(guān)系的是 （ ）</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image050.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image051.gif" width="0" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306384" onclick="function anonymous(){current_test_id ='daan-306384';}" type="submit" /> <p>B</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306383" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306383';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306383" onclick="function anonymous(){current_test_id ='shiti-306383';}" type="submit" /> <br /><input class="but" id="test-306383" onclick="function anonymous(){ checkpass(this,'306383','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306383" onclick="function anonymous(){ checkpass(this,'306383','1');return false;location.reload();}" type="submit" /> <p>一個小孩在蹦床上作游戲，他從高處落到蹦床上后又被彈起到原高度。小孩從高處開始下落到彈回的整個過程中，他的運動速度隨時間變化的圖象如圖所示，圖中<i>oa</i>段和<i>cd</i>段為直線。則根據(jù)此圖象可知，小孩和蹦床相接觸的時間為 ( )</p><p>A．<i>t</i><sub>2 </sub>~<i> t</i><sub>4</sub> B．<i>t</i><sub>1 </sub>~ <i>t</i><sub>4</sub></p><p>C．<i>t</i><sub>1 </sub>~ <i>t</i><sub>5</sub> D．<i>t</i><sub>2 </sub>~ <i>t</i><sub>5</sub></p><p><sub> </sub></p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image049.jpg" width="0" /> </p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306383" onclick="function anonymous(){current_test_id ='daan-306383';}" type="submit" /> <p>C</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306382" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306382';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306382" onclick="function anonymous(){current_test_id ='shiti-306382';}" type="submit" /> <br /><input class="but" id="test-306382" onclick="function anonymous(){ checkpass(this,'306382','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306382" onclick="function anonymous(){ checkpass(this,'306382','1');return false;location.reload();}" type="submit" /> <p>一根質(zhì)量為<i>Ｍ</i>的直木棒，懸掛在<i>O</i>點，有一只質(zhì)量為<i>m</i>的猴子抓著木棒，如圖甲所示。剪斷懸掛木棒的細(xì)繩，木棒開始下落，同時猴子開始沿棒向上爬，設(shè)在一段時間內(nèi)木棒沿豎直方向下落，猴子對地的高度保持不變。忽略空氣阻力。則圖乙的四個圖象中能正確反映在這段時間內(nèi)猴子對木棒作功的功率隨時間變化的關(guān)系的是： （ �。�</p><p><table cellspacing="0" cellpadding="0" align="left"><tr><td width="57" height="17"></td></tr><tr><td></td><td><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image047.gif" width="0" /></td></tr></table> </p><p><table cellspacing="0" cellpadding="0" align="left"><tr><td width="28" height="3"></td></tr><tr><td></td><td><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image048.gif" width="0" /></td></tr></table> </p><br clear="all" /><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306382" onclick="function anonymous(){current_test_id ='daan-306382';}" type="submit" /> <p>B</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306381" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306381';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306381" onclick="function anonymous(){current_test_id ='shiti-306381';}" type="submit" /> <br /><input class="but" id="test-306381" onclick="function anonymous(){ checkpass(this,'306381','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306381" onclick="function anonymous(){ checkpass(this,'306381','1');return false;location.reload();}" type="submit" /> <p>如圖所示，是一個說明示波管工作原理的示意圖，電子經(jīng)電壓<i>U</i><sub>1</sub>加速后以速度<i>v</i><sub>0</sub>垂直進入偏轉(zhuǎn)電場，離開電場時的偏轉(zhuǎn)量是<i>h</i>，兩平行板間距離為<i>d</i>，電勢差是<i>U</i><sub>2</sub>，板長是<i>l</i>，每單位電壓引起的偏轉(zhuǎn)量（<i>h/U</i>）叫做示波管的靈敏度，那么要提高示波管的靈敏度，可以采取下列哪些方法 ( )</p><p>A.增大兩板間電勢差<i>U</i><sub>2</sub> B.盡可能使板長<i>l</i>短一些</p><p>C.盡可能使板距<i>d</i>小一些 D.使加速電壓<i>U</i><sub>1</sub>升高一些</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image046.gif" width="0" align="left" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306381" onclick="function anonymous(){current_test_id ='daan-306381';}" type="submit" /> <p>C</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306380" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306380';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306380" onclick="function anonymous(){current_test_id ='shiti-306380';}" type="submit" /> <br /><input class="but" id="test-306380" onclick="function anonymous(){ checkpass(this,'306380','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306380" onclick="function anonymous(){ checkpass(this,'306380','1');return false;location.reload();}" type="submit" /> <p>如圖甲為電視機顯像管的整體結(jié)構(gòu)示意圖，其左端尾部是電子槍，被燈絲<i>K</i>加熱的陰極能發(fā)射大量的“熱電子”，“熱電子”經(jīng)過加速電壓<i>U</i>加速后形成電子束，高速向右射出。在顯像管的頸部裝有兩組相互垂直的磁偏轉(zhuǎn)線圈<i>L</i>，圖乙是其中一組“縱向”偏轉(zhuǎn)線圈從右側(cè)向左看去的示意圖，當(dāng)在磁偏轉(zhuǎn)線圈中通入圖示方向的電流時，在顯像管頸部形成水平向左（即甲圖中垂直紙面向外）的磁場，使自里向外（即甲圖中自左向右）射出的電子束向上偏轉(zhuǎn)；若該線圈通入相反方向的電流，電子束則向下偏轉(zhuǎn)。改變線圈中電流的大小，可調(diào)節(jié)偏轉(zhuǎn)線圈磁場的強弱，電子束的縱向偏轉(zhuǎn)量也隨之改變。這樣，通過控制加在“縱向”偏轉(zhuǎn)線圈上的交變電壓，就可以控制電子束進行“縱向”（豎直方向）掃描。同理，與它垂直放置在頸部的另一組“橫向”偏轉(zhuǎn)線圈，通入適當(dāng)?shù)慕蛔冸娏鲿r，能控制電子束進行“橫向”（水平方向）掃描。</p><p>兩組磁偏轉(zhuǎn)線圈同時通入適當(dāng)?shù)慕蛔冸娏鲿r，可控制電子束反復(fù)地在熒光屏上自上而下、自左而右的逐行掃描，從而恰好能將整個熒光屏“打亮”。如果發(fā)現(xiàn)熒光屏上亮的區(qū)域比正常時偏小，則可能是下列哪些原因引起的 （ ）</p><p>A．陰極發(fā)射電子的能力不足，單位時間內(nèi)發(fā)射的電子數(shù)偏少</p><p>B．偏轉(zhuǎn)線圈在顯像管的位置過于偏右</p><p>C．加速電場電壓過低，使得電子速率偏小</p><p>D．通過偏轉(zhuǎn)線圈的交變電流的最大值偏小，使得偏轉(zhuǎn)磁場的最大磁感強度偏小</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image044.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image045.gif" width="0" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306380" onclick="function anonymous(){current_test_id ='daan-306380';}" type="submit" /> <p>D </p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306379" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306379';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306379" onclick="function anonymous(){current_test_id ='shiti-306379';}" type="submit" /> <br /><input class="but" id="test-306379" onclick="function anonymous(){ checkpass(this,'306379','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306379" onclick="function anonymous(){ checkpass(this,'306379','1');return false;location.reload();}" type="submit" /> <p>在無線電儀器中，常需要在距離較近處安裝兩個線圈，并要求當(dāng)一個線圈中有電流變化時，對另一個線圈中的電流的影響盡量小。則圖中兩個線圈的相對安裝位置最符合該要求的是 （ ）</p><table height="124" cellspacing="0" cellpadding="0" width="511" align="left" vspace="0" hspace="0"><tr><td style="PADDING-RIGHT: 9pt; PADDING-LEFT: 9pt; PADDING-BOTTOM: 0cm; PADDING-TOP: 0cm" valign="top" align="left" height="124"><p><table cellspacing="0" cellpadding="0" align="left"><tr><td width="46" height="9"></td></tr><tr><td></td><td><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image043.gif" width="0" /></td></tr></table> </p></td></tr></table><br clear="all" /><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306379" onclick="function anonymous(){current_test_id ='daan-306379';}" type="submit" /> <p>D</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306378" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306378';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306378" onclick="function anonymous(){current_test_id ='shiti-306378';}" type="submit" /> <br /><input class="but" id="test-306378" onclick="function anonymous(){ checkpass(this,'306378','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306378" onclick="function anonymous(){ checkpass(this,'306378','1');return false;location.reload();}" type="submit" /> <p>如圖所示是進行訓(xùn)練用的“跑步機”示意圖，質(zhì)量為<i>m</i>運動員踩在與水平面成<i>α</i>角的傳送皮帶上，傳送皮帶運動過程中受到的阻力恒為<i>f</i>。當(dāng)運動員用力蹬傳送皮帶，使其以速度<i>v</i>勻速向后運動，則在這一過程中，下列說法中正確的是 （ ）</p><p>A．人腳對傳送皮帶的摩擦力是傳送皮帶所受的阻力</p><p>B．人對傳送皮帶不做功</p><p>C．人對傳送皮帶做功的功率為<i>mgv</i></p><p>D．人對傳送皮帶做功的功率為<i>fv</i></p><p><table cellspacing="0" cellpadding="0" align="left"><tr><td width="23" height="16"></td></tr><tr><td></td><td><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image042.gif" width="0" /></td></tr></table><i> </i></p><p><i> </i></p><p><i> </i></p><p><i> </i></p><p><i> </i></p><p><i> </i></p><p><i> </i></p><br clear="all" /><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306378" onclick="function anonymous(){current_test_id ='daan-306378';}" type="submit" /> <p>D </p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306377" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306377';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306377" onclick="function anonymous(){current_test_id ='shiti-306377';}" type="submit" /> <br /><input class="but" id="test-306377" onclick="function anonymous(){ checkpass(this,'306377','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306377" onclick="function anonymous(){ checkpass(this,'306377','1');return false;location.reload();}" type="submit" /> <p>如圖所示，<i>A</i>、<i>B</i>兩質(zhì)點以相同的水平速度<i>v</i><sub>0</sub>沿<i>x</i>軸正方向拋出，<i>A</i>在豎直平面內(nèi)運動，落地點為<i>P</i><sub>1</sub>，<i>B</i>沿光滑斜面運動，落地點為<i>P</i><sub>2</sub>。<i>P</i><sub>1</sub>和<i>P</i><sub>2</sub>在同一水平面上，不計空氣阻力。則下面說法中正確的是 （ ）</p><p>A．<i>A</i>、<i>B</i>的運動時間相同</p><p>B．<i>A</i>、<i>B</i>沿<i>x</i>軸方向的位移相同</p><p>C．<i>A</i>、<i>B</i>落地時的動量相同</p><p>D．<i>A</i>、<i>B</i>落地時的動能相同</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image040.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image041.gif" width="0" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306377" onclick="function anonymous(){current_test_id ='daan-306377';}" type="submit" /> <p>D</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306376" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306376';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306376" onclick="function anonymous(){current_test_id ='shiti-306376';}" type="submit" /> <br /><input class="but" id="test-306376" onclick="function anonymous(){ checkpass(this,'306376','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306376" onclick="function anonymous(){ checkpass(this,'306376','1');return false;location.reload();}" type="submit" /> <p>如圖所示，一個小球從斜面上被拋出，拋出時初速度<i>v</i><sub>0</sub>的方向與斜面垂直，它最后落到斜面上的某點。不計空氣阻力，下面關(guān)于小球在空中的運動的說法中正確的是( )</p><p> �。粒∏虻倪\動可以看作是沿水平方向的勻速運動和豎直向下的自由落體運動的疊加</p><p> �。拢∏虻倪\動可以看作是沿垂直斜面方向的勻速運動和平行斜面向下的自由落體運動的疊加</p><p> �。茫∏虻倪\動可以看作是沿垂直斜面方向的勻速運動和沿斜面向下的勻加速運動的疊加</p><p> �。模∏虻倪\動可以看作是沿水平方向的勻速運動和沿豎直方向的勻變速運動的疊加</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image039.gif" width="0" align="left" /></p><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306376" onclick="function anonymous(){current_test_id ='daan-306376';}" type="submit" /> <p> D</p><p></p></li><li style="OVERFLOW: hidden; WIDTH: 650px">難度： <img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/sts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /><img height="0" src="http://thumb.1010pic.com/pic1/gzwl/site_media/img/nsts.gif" width="0" /> 題型： 知識點： <input class="but" id="test-306375" onclick="function anonymous(){$('inputtext').value ='';$('type_id').value ='0';currenttype ='0';currentdifficult='None';$('difficult').value ='None'; ;currentid='306375';currentlessonid='None'; $('zwtestright-top').style.display='';$('zwtestleft').style.display='';return false;}" type="submit" /> <input class="but" id="test-306375" onclick="function anonymous(){current_test_id ='shiti-306375';}" type="submit" /> <br /><input class="but" id="test-306375" onclick="function anonymous(){ checkpass(this,'306375','0');return false;location.reload();}" type="submit" /> <input class="but" id="testcheckpass-306375" onclick="function anonymous(){ checkpass(this,'306375','1');return false;location.reload();}" type="submit" /> <p>在一根軟鐵棒上繞有一組線圈，<i>a</i>、<i>c</i>是線圈的兩端，<i>b</i>為中心抽頭。把<i>a</i>端和<i>b</i>抽頭分別接到兩條平行金屬導(dǎo)軌上，導(dǎo)軌間有勻強磁場，方向垂直于導(dǎo)軌所在平面并指向紙內(nèi)，如圖所示。金屬棒<i>PQ</i>在外力作用下以圖示位置為平衡位置左右作簡諧運動，運動過程中保持與導(dǎo)軌垂直，且兩端與導(dǎo)軌始終接觸良好。下面的哪些過程中<i>a</i>、<i>c</i>點的電勢都比<i>b</i>點的電勢高？ （ ）</p><p>A．<i>PQ</i>從平衡位置向左邊運動的過程中</p><p>B．<i>PQ</i>從左邊向平衡位置運動的過程中</p><p>C．<i>PQ</i>從平衡位置向右邊運動的過程中</p><p>D．<i>PQ</i>從右邊向平衡位置運動的過程中</p><p><img height="0" src="http://thumb.1010pic.com/pic1/2012/07/10/15/2012071015342618036981.files/image038.gif" width="0" /> </p><br clear="all" /><p></p><input class="but" style="COLOR: red" onclick="function anonymous(){return false;}" type="submit" /> <input class="but" id="test-306375" onclick="function anonymous(){current_test_id ='daan-306375';}" type="submit" /> <p> C </p><p></p><ul /><p class="pagenav">1 2 3 4 ...52 53 54 下一頁 ? </p></li></td></tr><></></table></div></div> <p class='bottom'> <a href='http://www.dads4merica.com/gzwl/shiti_id_da9281f236ddc52de68f7d308e5627d0' class='daan' target="_blank">查看答案和解析>></a> </p> </div> </div> <div id="l5giwl7" class="right_box"> <br /> <div class="t12gzkc" id="book_related"></div> <div id="jbzhbh6" class="box_head"><div><strong>同步練習(xí)冊答案</strong></div></div> <div id="oomaqwn" class="box_body" style="width:292px;"> <div id="m8bpouw" class="rank_list"><ul> <li><a href="http://www.dads4merica.com/search/onlybook?word=%C8%AB%C6%B7%D7%F7%D2%B5%B1%BE" target=_blank>全品作業(yè)本答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%CD%AC%B2%BD%B2%E2%BF%D8%D3%C5%BB%AF%C9%E8%BC%C6" target=_blank>同步測控優(yōu)化設(shè)計答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%B3%A4%BD%AD%D7%F7%D2%B5%B1%BE%CD%AC%B2%BD%C1%B7%CF%B0%B2%E1" target=_blank>長江作業(yè)本同步練習(xí)冊答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%CD%AC%B2%BD%B5%BC%D1%A7%B0%B8%BF%CE%CA%B1%C1%B7" target=_blank>同步導(dǎo)學(xué)案課時練答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%C8%CA%B0%AE%D3%A2%D3%EF%CD%AC%B2%BD%C1%B7%CF%B0%B2%E1" target=_blank>仁愛英語同步練習(xí)冊答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%D2%BB%BF%CE%D2%BB%C1%B7%B4%B4%D0%C2%C1%B7%CF%B0" target=_blank>一課一練創(chuàng)新練習(xí)答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%CA%B1%B4%FA%D0%C2%BF%CE%B3%CC" target=_blank>時代新課程答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%D0%C2%B1%E0%BB%F9%B4%A1%D1%B5%C1%B7" target=_blank>新編基礎(chǔ)訓(xùn)練答案</a></li> <li><a href="http://www.dads4merica.com/search/onlybook?word=%C4%DC%C1%A6%C5%E0%D1%F8%D3%EB%B2%E2%CA%D4" target=_blank>能力培養(yǎng)與測試答案</a></li> <li><a href="http://www.dads4merica.com/daan/" target=_blank>更多練習(xí)冊答案</a></li></ul> </div> </div> <div id="ajxwkb7" class="_vzwjs25mty8"></div> <script type="text/javascript"> (window.slotbydup = window.slotbydup || []).push({ id: "u3151536", container: "_vzwjs25mty8", async: true }); 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