Q7.2 3/3 points (graded) Consider the three cases with a block on an incline plane. Assume that friction and air resistance are negligible in all cases. A. A 1 kg box is released from a height 2h. B. A 2 kg box is released from a height h. C. A 2 kg box is released from a height h, but on a track with a different inclination angle. 1 kg 2 kg 2 kg A B C a) Rank the work done by gravity on the carts from the top to the bottom of the incline plane. V A = B = C b) Rank the kinetic energy of the carts at the bottom of the track from largest to smallest. A = B = C V > c) Rank the speed at the bottom of the track, from largest to smallest. A > B = C V V
Q7.3 4/4 points (graded) A box sits on the horizontal bed of a truck accelerating to the left as shown. Static friction between the box and the truck keeps the box from sliding around as the truck drives. a) The work done on the box by the static frictional force as the accelerating truck moves a distance D to the left is: positive V Briefly explain your answer: left > b) Assume now that the truck is turning a corner at constant speed in the direction shown. The acceleration of the box at point P is: 0 zero 1 0+ 01 01 01 0% x 01 v