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Q. You purchase a rectangular piece of metal that has dimensions 5x15x30 mm and mass 0.058 kg the seller tells you that the metal is gold. To check this, you compute an average density of the piece. What value do you get? Were you cheated?

Q. Automobile engine slows down from 4500 rpm to 1200 rpm in 2.5 s. compute (a) its angular acceleration, assumed constant and (b) total number of revolutions the engine makes in this time.

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