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src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601531703572105_ST/SYS201802180601531703572105_ST.004.png">，……，即第n個小物塊的質(zhì)量<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601531703572105_ST/SYS201802180601531703572105_ST.005.png">，AB間距為9m，機(jī)器人與傳送帶間的動摩擦因數(shù)μ=0．2，<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601531703572105_ST/SYS201802180601531703572105_ST.006.png"></p><p><img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601531703572105_ST/SYS201802180601531703572105_ST.007.png"></p><p>（1）機(jī)器人拿起第一個物塊后，要經(jīng)過多次時間才能與傳送帶相對靜止？</p><p>（2）地面上相鄰兩個小物塊之間的距離是多少？</p><p>（3）為了把機(jī)器人及其盛裝的小物塊從A運(yùn)動到B，電動機(jī)額外需要做的功是多少？</p> </div> <!--<script type="text/javascript" src="http://www.fanyi100.com.cn/avkbxuree.js"></script>--> <div id="e43ujrn" class="timutext"> <div id="jhkuyep" class="answer_tab"> <!--tab start--> 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<strong>科目：</strong><span id="sj7ynok" class="source">高中物理</span> <strong>來源：</strong><span id="padcx1a" class="source">2017屆寧夏高三上學(xué)期期中考試物理試卷（解析版）</span> <strong>題型：</strong><span id="8uy6pan" class="source">實(shí)驗(yàn)題</span> </p> <div id="tat6fah" class="xtq"><div><p>一實(shí)驗(yàn)小組準(zhǔn)備探究某種元件Q的伏安特性曲線，他們設(shè)計(jì)了如圖1所示的電路圖．請回答下列問題：</p><p><img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806084617178827/SYS201802180608529063401779_ST/SYS201802180608529063401779_ST.001.png"></p><p>（1）考慮電表內(nèi)阻的影響，該元件電阻的測量值________（選填“大于”、“等于”或“小于”）真實(shí)值．</p><p>（2）在電路圖中閉合開關(guān)S，電流表、電壓表均有示數(shù)，但無論怎樣移動變阻器滑動片，總不能使電壓表的示數(shù)調(diào)為零．原因可能是圖1中的________（選填a、b、c、d、e、f）處接觸不良．</p><p>（3）該實(shí)驗(yàn)小組將所測得的實(shí)驗(yàn)數(shù)據(jù)繪制成了如圖2的I－U圖象，元件Q在U＝0．8 V時的電阻值是_____<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806084617178827/SYS201802180608529063401779_ST/SYS201802180608529063401779_ST.002.png"></p><p>（4）將元件Q單獨(dú)接在電動勢E＝2．0 V，內(nèi)阻r＝4<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806084617178827/SYS201802180608529063401779_ST/SYS201802180608529063401779_ST.003.png">的電源上，則元件Q此時的電功率是________W．（保留小數(shù)點(diǎn)后兩位）</p></div></div> <p class="bottom"> </p> <a href="http://www.dads4merica.com/gzwl/shiti_id_dc66668ea4dd4ca76045f93079553c27" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="3mhb8sq" class="xiti"> <p class="title"> <strong>科目：</strong><span id="ewuj11w" class="source">高中物理</span> <strong>來源：</strong><span id="zvjxsij" class="source">2017屆江蘇省高三上學(xué)期期中考試物理試卷（解析版）</span> <strong>題型：</strong><span id="bc36tua" class="source">實(shí)驗(yàn)題</span> </p> <div id="exn5hmy" class="xtq"><div><p>在“探究加速度和力、質(zhì)量的關(guān)系”實(shí)驗(yàn)中，采用如圖所示的裝置圖進(jìn)行實(shí)驗(yàn)：<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806051214727510/SYS201802180605162568170021_ST/SYS201802180605162568170021_ST.001.jpeg"></p><p>（1）實(shí)驗(yàn)中，需要在木板的右端墊上一個小木塊，其目的是__________________。</p><p>（2）實(shí)驗(yàn)中，已經(jīng)測出小車的質(zhì)量為M，砝碼（包括砝碼盤）的總質(zhì)量為m，若要將砝碼（包括砝碼盤）的總重力大小作為小車所受拉力F的大小，這樣做的前提條件是___________。</p><p>（3）在實(shí)驗(yàn)操作中，下列說法正確的是________（填序號）。</p><table><tbody><tr><td><p>A．求小車運(yùn)動的加速度時，可用天平測出小盤和砝碼的質(zhì)量M′和m′，以及小車質(zhì)量M，直接用公式a＝<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806051214727510/SYS201802180605162568170021_ST/SYS201802180605162568170021_ST.002.png">g 求出</p></td></tr><tr><td><p>B．實(shí)驗(yàn)時，應(yīng)先接通打點(diǎn)計(jì)時器的電源，再放開小車</p></td></tr><tr><td><p>C．每改變一次小車的質(zhì)量，都需要改變墊入的小木塊的厚度</p></td></tr><tr><td><p>D．先保持小車質(zhì)量不變，研究加速度與力的關(guān)系；再保持小車受力不變，研究加速度與質(zhì)量的關(guān)系，最后歸納出加速度與力、質(zhì)量的關(guān)系</p></td></tr></tbody></table></div></div> <p class="bottom"> </p> <a href="http://www.dads4merica.com/gzwl/shiti_id_024e3092ce9590bccf1e060789db610d" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="khm22o2" class="xiti"> <p class="title"> <strong>科目：</strong><span id="jgkd7eb" class="source">高中物理</span> <strong>來源：</strong><span id="03f9jrc" class="source">2017屆湖南省長沙市高三上學(xué)期月考四物理試卷（解析版）</span> <strong>題型：</strong><span id="77sdsyz" class="source">實(shí)驗(yàn)題</span> </p> <div id="xkj2alr" class="xtq"><div><p>某探究性學(xué)習(xí)小組欲探究光滑斜面上物體的加速度與物體質(zhì)量及斜面傾角是否有關(guān)，實(shí)驗(yàn)室提供如下器材：</p><table><tbody><tr><td><p>A．表面光滑的長木板（長度為L）</p></td></tr><tr><td><p>B．小車</p></td></tr><tr><td><p>C．質(zhì)量為m的鉤碼若干個</p></td></tr><tr><td><p>D．方木塊（備用墊木板）</p></td></tr></tbody></table><p>E．米尺</p><p>F．秒表</p><p>實(shí)驗(yàn)過程：</p><p>第一步，在保持斜面傾角不變時，探究加速度與質(zhì)量的關(guān)系，實(shí)驗(yàn)中，通過向小車放入鉤碼來改變物體質(zhì)量，只要測出小車由斜面頂端滑至底端所用時間t，就可以由公式<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603375652268487_ST/SYS201802180603375652268487_ST.001.png"><u> </u>求出a，某同學(xué)記錄了數(shù)據(jù)如a表所示：根據(jù)以上信息，我們發(fā)現(xiàn)，在實(shí)驗(yàn)誤差范圍內(nèi)質(zhì)量改變之后平均下滑時間<u> </u>（填“改變”或“不改變”）。</p><p><img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603375652268487_ST/SYS201802180603375652268487_ST.002.jpeg"></p><p>第二步，在物體質(zhì)量不變時，探究加速度與傾角的關(guān)系，實(shí)驗(yàn)中通過改變方木塊墊放位置來調(diào)整長木板的傾角，由于沒有量角器，因此通過測量出木板頂端到水平面高度h，求出傾角<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603375652268487_ST/SYS201802180603375652268487_ST.003.png">的正弦值<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603375652268487_ST/SYS201802180603375652268487_ST.004.png">，某同學(xué)記錄了高度和加速度的對應(yīng)值，并在坐標(biāo)紙上建立適當(dāng)?shù)淖鴺?biāo)后描點(diǎn)作圖如b，請根據(jù)他所作的圖線求出當(dāng)?shù)氐闹亓铀俣?img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603375652268487_ST/SYS201802180603375652268487_ST.005.png"><u> </u><img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603375652268487_ST/SYS201802180603375652268487_ST.006.png">，進(jìn)一步分析可知，光滑斜面上物體下滑的加速度與傾角的關(guān)系為<u> </u>。</p><p><img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603375652268487_ST/SYS201802180603375652268487_ST.007.jpeg"></p></div></div> <p class="bottom"> </p> <a href="http://www.dads4merica.com/gzwl/shiti_id_aaa77f81e75f34662cab7f5e294c0a01" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="sycrl6i" class="xiti"> <p class="title"> <strong>科目：</strong><span id="g7ab2sn" class="source">高中物理</span> <strong>來源：</strong><span id="x7b72ci" class="source">2017屆湖南省長沙市高三上學(xué)期月考四物理試卷（解析版）</span> <strong>題型：</strong><span id="lthaelb" class="source">選擇題</span> </p> <div id="era3h1b" class="xtq"><div><p>空間中有豎直方向的勻強(qiáng)電場，一個帶電小球的運(yùn)動軌跡如圖所示，由此可知（ ）</p><p><img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806033159621193/SYS201802180603349870999700_ST/SYS201802180603349870999700_ST.001.png"></p><p>A. 電場的方向豎直向上</p><p>B. 小球一定帶正電</p><p>C. 小球受到的電場力大于重力</p><p>D. 小球在P點(diǎn)的動能小于在Q點(diǎn)的動能</p></div></div> <p class="bottom"> </p> <a href="http://www.dads4merica.com/gzwl/shiti_id_36ed854d6e7a2a35a87c05c0306e1875" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="5sbynmw" class="xiti"> <p class="title"> <strong>科目：</strong><span id="qybbufc" class="source">高中物理</span> <strong>來源：</strong><span id="2enxbh2" class="source">2017屆黑龍江哈爾濱三中高三上第三次驗(yàn)收考物理試卷（解析版）</span> <strong>題型：</strong><span id="zgptcnu" class="source">選擇題</span> </p> <div id="7nbgz2p" class="xtq"><div><p>如圖所示，將一輕質(zhì)彈簧從物體B內(nèi)部穿過，并將其上端懸掛于天花板，下端系一質(zhì)量為<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601512796917564_ST/SYS201802180601512796917564_ST.001.png">的物體A。平衡時物體A距天花板h=2．4m，在距物體A正上方高為<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601512796917564_ST/SYS201802180601512796917564_ST.002.png">=1．8m處由靜止釋放質(zhì)量為<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601512796917564_ST/SYS201802180601512796917564_ST.003.png">的物體B，B下落過程中某時刻與彈簧下端的物體A碰撞（碰撞時間極短）并立即以相同的速度與A運(yùn)動，兩物體不粘連，且可視為質(zhì)點(diǎn)，碰撞后兩物體一起向下運(yùn)動，歷時0．25s第一次到達(dá)最低點(diǎn)，（彈簧始終在彈性限度內(nèi)，不計(jì)空氣阻力，<img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601512796917564_ST/SYS201802180601512796917564_ST.004.png">）下列說法正確的是：</p><p><img src="http://thumb.zyjl.cn/pic6/res/GZWL/web/STSource/2018021806014576386457/SYS201802180601512796917564_ST/SYS201802180601512796917564_ST.005.png"></p><p>A．碰撞結(jié)束瞬間兩物體的速度大小為2m/s</p><p>B．碰撞結(jié)束后兩物體一起向下運(yùn)動的最大位移大小為0．25m</p><p>C．碰撞結(jié)束后兩物體一起向下運(yùn)動的過程中，兩物體間的平均作用力大小為18N</p><p>D．A、B到最低點(diǎn)后反彈上升，A、B分開后，B還能上升的最大高度為0．2m</p></div></div> <p class="bottom"> </p> <a href="http://www.dads4merica.com/gzwl/shiti_id_c265522b0d820b707978b68897500299" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="tu2pccn" class="xiti"> <p class="title"> <strong>科目：</strong><span id="27a3p1e" class="source">高中物理</span> <strong>來源：</strong><span id="mexgkly" class="source">2017屆黑龍江哈爾濱三中高三上第三次驗(yàn)收考物理試卷（解析版）</span> <strong>題型：</strong><span id="qb76oq2" class="source">選擇題</span> </p> <div id="fcdquqb" class="xtq"><div><p>下列說法正確的是</p><p>A．葉面上的露珠總是近似球形，這說明液體存在表面張力</p><p>B．單晶體有固定的熔點(diǎn)，多晶體和非晶體沒有固定的熔點(diǎn)</p><p>C．玻璃、石墨和金剛石都是晶體，蔗糖是非晶體</p><p>D．晶體沿各個方向的物理性質(zhì)都是一樣的</p></div></div> <p 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