問題詳情
10. Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. B is raised twice as fast as mass A. The magnitudes of the forces exerted by masses A and B are, respectively, FA and FB, while the power supplied for each is PA and PB. Which statement is correct?
(A) FB =FA；PB=PA.
(B) FB = FA； PB=2 PA.
(C) FB=2 FA；PB=PA.
(D) FB = 2 FA； PB = 2 PA.
(E) PA = FA； PB = FB.
參考答案
答案：B
統計：A:0,B:0,C:1,D:0,E:0
難度：計算中