Circular Motion (id: f33106836)

本题目来源于试卷: Circular Motion，类别为 美国物理杯赛(Physics Bowl)

[单选题]
04.41: A centripetal force of 5.0 newtons is applied to a rubbe-+ut g6 a ,;rx 9yzh-v04ynitll.lueor stopper movin; 6zmk 05*n pnoeh8m5 )tiqvifg at a constant speed in a horizontal circle. If the same force is applied, but 60v*5eiihnpn8 mq tfko5z)m ; the radius is made smaller, what happens to the speed v, and the frequency f, of the stopper?

A. $v$ increases & $f$ increases
B. $v$ decreases & $f$ decreases
C. $v$ increases & $f$ decreases
D. $v$ decreases & $f$ increases
E. neither changes


参考答案:  D


本题详细解析: 暂无

微信扫一扫，分享更方便