Question

The moment of inertia of a body about a given axis is 1.2 kg m−−−

2

. To produce a rotational kinetic energy of

1500 J an angular acceleration of 25 rad/ s2 must be applied for :

a) 8.5 s b) 5 s

c) 2 s d) 1 s

Answer 1

Answer:

KE=Iw^2/2

From there w=50

After that w=alphat

Then t=2sec(c) option