下列物理量中,屬于矢量的是(     )                                                                    

    A.       速度           B.             位移 C. 路程       D. 時(shí)間

                                                                                                                                    

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質(zhì)點(diǎn)作勻速圓周運(yùn)動(dòng)時(shí),不變的物理量(                   )                                                  

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在圖所示的電路中,兩個(gè)靈敏電流表G1和G2的零點(diǎn)都在刻度盤(pán)中央,當(dāng)電流從“+”接線(xiàn)柱流入時(shí),指針向左擺;電流從“﹣”接線(xiàn)柱流入時(shí),指針向右擺.在電路接通后再斷開(kāi)的瞬間,下列說(shuō)法中符合實(shí)際的情況是(     )                            

                                                                                                         

    A.  G1表指針向左擺,G2表指針向右擺

    B.  G1表指針向右擺,G2表指針向左擺

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建筑工人用圖所示的定滑輪裝置運(yùn)送建筑材料.質(zhì)量為70.0kg的工人站在地面上,通過(guò)定滑輪將20.0kg的建筑材料以0.50m/s2的加速度拉升,忽略繩子和定滑輪的質(zhì)量及定滑輪的摩擦,則工人對(duì)地面的壓力大小為 (g取l0m/s2)(   )                                                                                                                               

                                                                                                              

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科目:高中物理 來(lái)源: 題型:


在探究加速度與力、質(zhì)量的關(guān)系實(shí)驗(yàn)中,采用如圖1所示的實(shí)驗(yàn)裝置,小車(chē)及車(chē)中砝碼的質(zhì)量用M表示,盤(pán)及盤(pán)中砝碼的質(zhì)量用m表示,小車(chē)的加速度可由小車(chē)拖動(dòng)的紙帶上打出的點(diǎn)計(jì)算出.                                   

(1)打點(diǎn)計(jì)時(shí)器是一種計(jì)時(shí)儀器,其電源頻率為50Hz,常用的電磁式打點(diǎn)計(jì)時(shí)器和電火花計(jì)時(shí)器,使用的都是                                                                                                             (填“直流電”或“交流電”),它們是每隔           s打一個(gè)點(diǎn).                                                                                                             

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(3)某同學(xué)將長(zhǎng)木板右端適當(dāng)墊高,其目的是.但他把長(zhǎng)木板的右端墊得過(guò)高,使得傾角過(guò)大.用a表示小車(chē)的加速度,F(xiàn)表示細(xì)線(xiàn)作用于小車(chē)的拉力.他繪出的a﹣F關(guān)系圖象是                                                     

                               

(4)已知打點(diǎn)計(jì)時(shí)器使用的交流電頻率為50Hz,每相鄰兩個(gè)計(jì)數(shù)點(diǎn)間還有4個(gè)點(diǎn)未畫(huà)出,利用圖2給出的數(shù)據(jù)可求出小車(chē)下滑的加速度a=                                                                                     m/s2.(結(jié)果保留三位有效數(shù)字)                                                                                                                                   

                                                                                                                                       

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以10m/s的速度勻速行駛的汽車(chē),剎車(chē)后做勻減速直線(xiàn)運(yùn)動(dòng),加速度大小為2m/s2.則汽車(chē)剎車(chē)6s末的位移大小為(    )                                                                                                                                 

    A.       25m            B.             24m  C. 0     D. 30m

                                                                                                                                    

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打點(diǎn)計(jì)時(shí)器使用的電源頻率為50Hz,常用的電磁打點(diǎn)計(jì)時(shí)器和電火花計(jì)時(shí)器使用的是          (填“直流電”、“交流電”),正常工作時(shí)每隔                                                            s打一個(gè)點(diǎn).如圖是做“探究小車(chē)速度隨時(shí)間變化的規(guī)律”的實(shí)驗(yàn)中打點(diǎn)計(jì)時(shí)器打出的紙帶.紙帶上每?jī)蓚(gè)記數(shù)點(diǎn)間還有四個(gè)計(jì)時(shí)點(diǎn)未畫(huà)出.已知數(shù)S1=1.2cm,S2=2.4cm,S3=3.6cm,S4=4.8cm則打3號(hào)記數(shù)點(diǎn)對(duì)應(yīng)的小車(chē)速度V3=                      m/s,小車(chē)運(yùn)動(dòng)的加速度a=       m/s2

                                                               

                                                                                                                                    

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甲乙兩物體都做勻速圓周運(yùn)動(dòng),運(yùn)動(dòng)的半徑之比為1:2,當(dāng)甲轉(zhuǎn)過(guò)60°時(shí),乙轉(zhuǎn)過(guò)45°,則甲乙的角速度之比為            ,向心加速度之比為                                                          .                             

                                                                                                                                     

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關(guān)于做勻速圓周運(yùn)動(dòng)物體的線(xiàn)速度的大小和方向,下列說(shuō)法中正確的是(   )                                          

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