You are lowering two boxes, one on top of the other, down a ramp by pulling on a rope parallel to the surface of the ramp. both boxes move together at a constant speed of 15.0 cm/s. the coefficient of kinetic friction between the ramp and the lower box is 0.444, and the coefficient of static friction between the two boxes is 0.800.

(a) what force do you need to exert to accomplish this? (b) what are the magnitude and direc- tion of the friction force on the upper box?

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

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d. platinum would have the greatest temperature increase because it has the lowest specific heat.