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.
Answer: B
You might also like to view...
When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the
A) ball. B) floor. C) need more information
Two pieces of kryptonite, #1 and #2, have identical masses, but the net force applied to #1 is 400 N and to #2 is 20 N. The acceleration
A. of #2 is larger. B. depends on the weight of each piece of kryptonite. C. of each piece of kryptonite is the same. D. of #1 is larger.
For an ideal gas of a given mass, if the pressure remains the same and the volume decreases:
a. the average kinetic energy of the molecules decreases. b. the average kinetic energy of the molecules stays the same. c. the average kinetic energy of the molecules increases. d. Nothing can be determined about the molecular kinetic energy.
Consider the elliptical orbit of a comet around the Sun. Where in its orbit does it have the largest amount of total orbital energy?
A) when it is farthest from the Sun B) when it is closest to the Sun C) It always has the same total orbital energy.