Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively 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.

Question

Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively 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.

Quizplus · Accepted Answer

The Answer of Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively 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.

Two Equal Masses Are Raised at Constant Velocity by Ropes