Answer to Question #78329 in Mechanics | Relativity for Prerana

Question

The kinetic energy of rotation of a
particle in circular motion is 100 J. It moves
once in the circle in 44s. Calculate the
rotational inertia of the particle.

Answer 1

The kinetic energy of rotation of a particle:
E=1/2 Iω^2
ω=2π/44 rad/s.
I=2E/ω^2 =2(100)/(2π/44)^2 = 9800 kgm^2