Question

a uniform disk of mass 3kg and radius 12cm rotates at 480 rev/min. find its kinetic energy (Hint : I of uniform disk =1/2MR2)

Answer 1

KE=1/2 I w^2
angular speed= PI*rev/min*1min/60sec= 480*2pi/60= 50.3 rad/sec
I= 1/2 *3*.12^2=.0216 kg.m^2

KE=1/2 *I*w^2

Answer 2

a uniform disk of mass 3kg and radius 12cm rotates at 480 rev/min. find its kinetic energy (Hint : I of uniform disk =1/2MR2)