Exam2_practice_solns - The next two questions pertain to the situation described below A box of mass = 5.3 kg is pulled with constant velocity up an

# Exam2_practice_solns - The next two questions pertain to...

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The next two questions pertain to the situation described below. A box of mass ࠵? = 5 . 3 kg is pulled with constant velocity up an inclined plane for distance ࠵? = 2 m. It is pulled by a rope with tension ࠵? and which is parallel to the ramp. The ramp makes an angle of ࠵? = 31° with respect to the horizontal. The kinetic coefficient of friction between the box and the plane is ࠵? ! = 0 . 29 . 1. (8 points) How much work is done on the box by gravity as the box is pulled up the ramp a distance ࠵? ? a. ࠵?࠵?࠵? sin ࠵? b. ࠵?࠵?࠵? sin ࠵? c. ࠵?࠵?࠵? cos ࠵? d. ࠵?࠵?࠵? cos ࠵? e. ࠵?࠵?࠵? tan ࠵? 2. (8 points) How much work is done on the box by the rope as the box is pulled up the ramp a distance ࠵? ? a. There is no way to know since the tension in the rope is not given. b. ࠵? !"#\$ = 15 . 5 J c. ࠵? !"#\$ = 25 . 8 J d. ࠵? !"#\$ = 79 . 4 J e. ࠵? !"#\$ = 53 . 6 J