Question

The angular speed of a motor wheel is increased from 1200 rpm to 3120 rpm in 16 seconds. (i) What is its angular acceleration, (ii) How many revolutions does the engine make during this time?​

Answer 1

Answer:

use w1=w2+at

w1=initial angular speed

w2=final angular speed

w1=1200rpm=20rps

w2=3120rpm=52rps

52=20+a*16

a=2

then for no. of revolutions use s=w1t+(1/2)a*t^2

s=20*16+(1/2)*2*16^2

no. of revolutions = 576