Typical Forces (id: de6ea636a)

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

[单选题]
95.34: A student pulls a wooden box along a roughgj *j-57jow g .a 1vnc*v,lkswv*wz h5 h;i 8 /8tp-h mpwgj7w*x.q vtovorizontal floor at constant speed by means of a force P as sh;/qjpi .pwhvo*8mv twt7-g 8xown to the right. Which of the following must be true?

A. $ P$ > f and N < W.
B. $P$ > f and N = W.
C. $P $= f and N > W.
D. $P$ = f and N = W.
E. $P$ < f and N = W.


参考答案:  A


本题详细解析: 暂无

微信扫一扫，分享更方便