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Moment of inertia of a body about a given axis is 1.5 kg .  Initially the body is at rest.  In order to produce a rotational kinetic energy of 1200 J, the angular acceleration of 20 rad/ must be applied about the axis for a duration of

(a)

2.5 s

(b)

2 s

(c)

5 s

(d)

3 s


Question ID - 51283 | Toppr Answer

Moment of inertia of a body about a given axis is 1.5 kg .  Initially the body is at rest.  In order to produce a rotational kinetic energy of 1200 J, the angular acceleration of 20 rad/ must be applied about the axis for a duration of

(a)

2.5 s

(b)

2 s

(c)

5 s

(d)

3 s

1 Answer - 5876 Votes

3537

Answer Key : (b) -

I=150;                  

=20rad/s2  

∴   = t

E= =1200

   1.5 (20t)2=1200J

⇒t = 2s



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