Question

What is the rotational kinetic energy of an object (I = 10 kgm2) rotating about a 5 m radius at 72 deg/s?

Answer 1

Rotational kinetic energy is given by \(K=\frac{1}{2}I\omega^2\) and moment of inertia for a point mass is given by \(I=mr^2\).

Answer 2

But they've already given I=10kgm2 ?

Answer 3

apply that value for I then.

Answer 4

worked out what i was doing wrong, forgot to square ω. silly mistake.

Answer 5

nw got it right?