Question

A wheel having a diameter of 3 m starts from rest
and accelerates uniformly to an angular velocity of
210 r.p.m. in 5 seconds. Angular acceleration of the
wheel is -
(A) 1.471
rad/s^2
(B) 3.31rad/s2
(C) 2.21rad/s2
(D) 1.1* rad/s2​

Answer 1

Answer:

option B is the right answer 3.31rad/S2

Answer 2

Explanation:

according to formula W= Wo + alpha (t)

where W and Wo are final and initial angular velocity and using W= 210 x 2pi /60 rad/sec

we get 22= Wo + alpha (t)

Wo = 0

therefore alpha= 22/5 = 4.4 rad/sec^2