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?