Calculate the rotational kinetic energy of a circular disc of mass 1kg and radius 0.2m rotating about an axis passing through its centre and perpendicular to its plane.the disc is making 30/pi rpm Share with your friends Share 3 Dinesh Pandey answered this Dear Student, mass, m=1 kgradius, R=0.2 mfrequency, ν=30π rpm=30π×160 rpsν=12π rpsangular velocity, ω=2πνω=2π×12π rad/s=1 rad/sMoment of inertia of disc, I=12MR2I=12×1×0.22I=0.02 kgm2Rotational kinetic energy of disc, Ek=12Iω2Ek=12×0.02×12=0.01 J 45 View Full Answer
