Question

Angular velocity of a particle becomes 4 times of its initial
angular velocity in 2 s. If initial angular velocity of particle is 4
rad/s, then average angular acceleration of particle is


12 rad/s2
6 rad/s2
3 rad/s2
Zero​

Answer 1

Explanation:

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Answer 2

Answer:

A particle has angular velocity 4rad/s at first, and it becomes 4 times the initial  angular velocity in 2 s, then the average angular acceleration of a particle is 6rad/s

Explanation:

• The angular acceleration(a) is the change in angular velocity(w) with time(t), which is

       $a=w/t$

From the question, we have

the initial angular velocity $w_{1}=4rad/s$

final angular velocity $w_{2}=4*w_{1}$

⇒$w_{2} =16rad/s$

time to change the angular velocity $t=2s$

therefore the angular acceleration $a=\frac{16-4}{2} =12/2=6rad/s$