Question

4. A wheel having a diameter of 3 m starts from rest
and accelerates uniformly to an angular velocity of
210 cp.m. in 5 s. Angular acceleration of the wheel is
(A) 1.47 rad's
(B) 3.37 rad s
(C) 2.2 rad
(D) 1.1 rad's​

Answer 1

Explanation:

Please Please Mark this brainliest

and follow me

Answer 2

Answer:

Explanation:

Average Angular Acceleration = Change in Angular Velocity / Change is Time

Average Angular Acceleration = Δω/Δt

Initial angular velocity = 0 rad/second (∵ it is at rest)

Final  angular velocity = 210 rotation per minute

                                    $= 210 ( \frac{2\pi }{60})$ rad/second

                                    = 7 $\pi$ rad/second

Change in Angular Velocity =  Δω = 7 $\pi$ rad/second - 0

                                                         = 7 $\pi$ rad/second

Change in Time = 5 - 0 = 5 seconds

Now,

Average Angular Acceleration = Δω/Δt

                                                   =  7 $\pi$ / 5 rad/second²