Question

A circular wheel of mass 50 kg and radius 200 mm is rotating at 300 r.p.m. Find its kinetic energy.

Answer 1

Answer:
493.29J
Explanation:
w= 300rpm
w=(300*2*pi)/60 convert rpm into rad/s
w=31.41rad/s
M given 50kg
R given as 200mm convert it in terms of meter
I=0.5* MR^2 (M R squared)
I=0.5*50 * (200*10^-3)^2
I=0.5*50*0.04
I=1 kgm^2
KE=0.5*I*w^2 (w squared)
KE=0.5*1*(31.41)^2
KE=493.29J