质量为m的质点A作圆锥摆运动，设质点速率始终为v，半径为R，绳子与竖直轴的夹角为θ，如图24所示。在质点绕行一周的过程中，（）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201901/46634a1b10a84d23ad3f0977e95877d6.png
举一反三
- 质量为m的质点A作圆锥摆运动，设质点速率始终为v，半径为R，绳子与竖直轴的夹角为θ，如图24所示。在质点绕行一周的过程中，（）[img=283x224]17a3dcb5d0ae21b.png[/img]
- 质点作半径为R的变速圆周运动时的加速度大小为（v表示任一时刻质点的速率）( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/566625ddf2c44d81babb2fdd6c1215b2.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/bceb93f381844a3988a0291fea01e102.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/e43ab8d2b7b4422a9088f99e594718cb.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/b1a89995aed242d9b12b93495a7ebdae.png" />
- 一质点沿半径为R的圆周运动，运动方程为 则t时刻质点的切向加速度http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/716180d7f6ad40d2b8e3986903774295.png
- 一质点沿半径为R的圆周运动，运动方程为http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/716180d7f6ad40d2b8e3986903774295.png则t时刻质点的切向加速度
- 质点作半径为R的变速率圆周运动，v为任一时刻质点的速率，则该质点的加速度大小是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/74c6af56cdc24e1894b25b6fceeed83b.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/5d036be82d8a49198abb6ac68bd124ca.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/fe33a5eff74449b5b0bbe7d471ee4337.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/aa79d26e5b344c8cb2a31f94ea310de9.png">