# 1. An automobile engine slows down from 3500 rpm to 1200 rpm in 2.5 s. Calculate (a) its angular…

1. An automobile engine slows down from

3500 rpm to 1200 rpm in 2.5 s. Calculate (a) its angular acceleration, assumed

constant, and (b) the total number of revolutions the engine makes in this

time.

2. A centrifuge accelerates uniformly from

rest to 15,000 rpm in 220 s. Through how many revolutions did it turn in this

time?