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

                                                                                                                                     

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:高中物理 來源: 題型:


兩個(gè)完全相同的小金屬球,它們的帶電荷量之比為5:1(皆可視為點(diǎn)電荷),它們?cè)谙嗑嘁欢ň嚯x時(shí)相互作用力為F1,如果讓它們接觸后再放回各自原來的位置上,此時(shí)相互作用力變?yōu)镕2,則F1:F2可能為(    )                   

    A. 5:2      B. 5:4              C.                     5:6    D. 5:9

                                                                                                                                  

查看答案和解析>>

科目:高中物理 來源: 題型:


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

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

                                                                                                                                       

查看答案和解析>>

科目:高中物理 來源: 題型:


下列四個(gè)圖中都有兩條圖線,分別表示一種直線運(yùn)動(dòng)過程的加速度和速度隨時(shí)間變化的圖象,其中可能正確的是(       )                                                                                                                                 

                A.                    B.    C.   D.

                                                                                                                                    

查看答案和解析>>

科目:高中物理 來源: 題型:


汽車從靜止開始以1m/s2的加速度作勻加速直線運(yùn)動(dòng),加速20s后作勻速運(yùn)動(dòng),問:                                              

(1)汽車在第5s末的速度為多大?                                                                            

(2)汽車在前5s內(nèi)通過的位移為多大?                                                                     

(3)汽車在前40s內(nèi)的平均速度為多大?                                                                    

                                                                                                                                    

查看答案和解析>>

科目:高中物理 來源: 題型:


地球半徑為R,地球表面的重力加速度為g,若高空中某處的重力加速度為,則該處距地面球表面的高度為(      )                                                                                                                          

    A.         (﹣1)R B. R            C. R  D. 2R

                                                                                                                                     

查看答案和解析>>

科目:高中物理 來源: 題型:


兩顆人造地球衛(wèi)星,都繞地球作圓周運(yùn)動(dòng),它們的質(zhì)量相等,軌道半徑之比=,則它們的運(yùn)行周期之比T1:T2=                                                                                         ,它們的速度大小之比=         .         

                                                                                                                                     

查看答案和解析>>

科目:高中物理 來源: 題型:


如圖,內(nèi)壁光滑、導(dǎo)熱良好的氣缸中用活塞封閉有一定質(zhì)量的理想氣體.當(dāng)環(huán)境溫度升高時(shí),對(duì)缸內(nèi)氣體說法正確的是(    )                                                                                                              

                                                                                                 

    A. 內(nèi)能增加,對(duì)外做功 B.     內(nèi)能不變,對(duì)外做負(fù)功

    C. 壓強(qiáng)增大,對(duì)外做功 D.    分子間的引力和斥力都增大

                                                                                                                             

查看答案和解析>>

科目:高中物理 來源: 題型:


一個(gè)半徑為r、質(zhì)量為m的重球用長度等于r的繩子掛在豎直的光滑墻壁A處(如圖),求:                                                                                                                                  

(1)繩子的拉力T.                                                                                                      

(2)墻壁的彈力N.                                                                                                      

                                                                                                                            

                                                                                                                                       

查看答案和解析>>

同步練習(xí)冊(cè)答案