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Q1. An Automobile engine slows down from 4500 rpm to 1200 rpm in 2.50 s. Calculate (a) its angular acceleration, assumed constant and (b) total number of revolutions the engine makes in this time.

Q2. Assume there are 1.2×10^4 civilizations broadcasting radio signals in the Milky Way Galaxy right now. On average, how many stars would we have to search before we would expect to hear a signal? Suppose there are 500 billion stars in the galaxy. How does your answer change if there are only 100 civilizations instead of 1.2×10^4?

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