下列物理量在運(yùn)算過(guò)程中遵循平行四邊形定則的有(                     )                               

    A.              位移                  B.                    功   C.   力    D. 加速度

                                                                                                                                       

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:高中物理 來(lái)源: 題型:


兩個(gè)完全相同的物塊AB,質(zhì)量均為m=0.8 kg,在同一粗糙水平面上以相同的初速度從同一位置開(kāi)始運(yùn)動(dòng)。圖中的兩條直線分別表示A物塊受到水平拉力F作用和B物塊不受拉力作用的vt圖象,求:

    (1)物塊A所受拉力F的大;

    (2)8 s末物塊AB之間的距離x。

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示,一水平放置的矩形閉合線框abcd在細(xì)長(zhǎng)磁鐵的N極附近豎直下落,保持bc邊在紙外,ad邊在紙內(nèi),由圖中位置Ⅰ經(jīng)過(guò)位置Ⅱ到位置Ⅲ,位置Ⅰ和位置Ⅲ都很接近位置Ⅱ,這個(gè)過(guò)程中線圈感應(yīng)電流(   )                             

                                                                                                    

    A.  沿abcd流動(dòng)

    B.  沿dcba流動(dòng)

    C.  先沿abcd流動(dòng),后沿dcba流動(dòng)

    D.  先沿dcba流動(dòng),后沿abcd流動(dòng)

                                                                                                                                       

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


交流發(fā)電機(jī)轉(zhuǎn)子有n匝線圈,每匝線圈所圍面積為S,勻強(qiáng)磁場(chǎng)的磁感應(yīng)強(qiáng)度為B,勻速轉(zhuǎn)動(dòng)的角速度為ω,線圈內(nèi)電阻為r,外電路電阻為R.當(dāng)線圈由圖中實(shí)線位置勻速轉(zhuǎn)動(dòng)90°到達(dá)虛線位置過(guò)程中,求:                        

(1)通過(guò)R的電荷量q為多少?                                                                                    

(2)R上產(chǎn)生電熱QR為多少?                                                                                      

                                                                                                                 

                                                                                                                                       

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


質(zhì)量為m的木塊靜止在一固定的斜面上,已知?jiǎng)幽Σ烈蛩貫棣蹋泵鎯A角為θ,木塊所受摩擦力為(    )                                                                                                                                         

                                                                                                        

    A.              μmgcosθ            B.                    μmgsinθ   C. mgcosθ   D. mgsinθ

                                                                                                                                       

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


(1)研究“共點(diǎn)力的合成”時(shí)得到的實(shí)驗(yàn)結(jié)果為如圖所示(F′與A、O共線,A端為固定橡皮條的圖釘,O為橡皮條與細(xì)線的結(jié)點(diǎn)),需要進(jìn)行比較的是                                                                                                ;(填“F1”、“F2”、“F”或“F′”)通過(guò)本實(shí)驗(yàn)可以驗(yàn)證                                                                                  

(2)在上述實(shí)驗(yàn)中所說(shuō)的合力與兩個(gè)分力具有相同的效果,是指下列說(shuō)法中的           .                              

A、彈簧秤的彈簧被拉長(zhǎng)                                                                B、固定橡皮條的圖釘受拉力產(chǎn)生形變                                                                                                                                     

C、細(xì)線套受拉力產(chǎn)生形變                                                             D、使橡皮條在某一方向上伸長(zhǎng)到某一長(zhǎng)度.                                                                                                                                       

                                                                                                               

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


在研究下列運(yùn)動(dòng)時(shí),能把物體看作質(zhì)點(diǎn)的是(          )                                                        

    A.  研究地球的自轉(zhuǎn)效應(yīng)

    B.  研究乒乓球的旋轉(zhuǎn)效應(yīng)

    C.  研究火車從南京到上海運(yùn)行需要的時(shí)間

    D.  研究一列火車通過(guò)長(zhǎng)江大橋所需的時(shí)間

                                                                                                                                    

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


下列物理量中是標(biāo)量的是(    )                                                                          

    A. 向心加速度          B. 周期        C. 線速度     D. 向心力

                                                                                                                                     

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示,在兩個(gè)固體薄片上涂上一層很薄的石蠟,然后用燒熱的鋼針尖接觸薄片,接觸點(diǎn)周圍的石蠟被熔化,如圖.則圖                                                                               所示薄片一定是晶體.                            

                                                                        

                                                                                                                             

查看答案和解析>>

同步練習(xí)冊(cè)答案