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Prelim_Exam__2_Spr04_v2

# Prelim_Exam__2_Spr04_v2 - NAME Recitation Instructor...

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NAME 2 I. SHORT ANSWER [40 points] Please write your answers in the spaces provided. 1. [6 points] Two identical balls start from rest at the same time at the same height on two side-by side ramps. One ball rolls along path A, while the other ball rolls along path B, always staying in contact with the ramp, as demonstrated in lecture. (a) Which ball gets to the end of the ramps first? (A) The one on path A (B) The one on path B (C) Both get there at the same time. Answer: (b) Which ball gets the end of the ramps with the greater speed? (A) The one on path A (B) The one on path B (C) Both get there with the same speed. Answer: 2. [3 points] An ice sailboat is stalled on a frozen lake on a windless day. A large fan is turned on to blow air into the sail. If all the wind from the fan strikes the sail and bounces backwards ( ), as demonstrated in lecture, which way will the craft move?
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