Question

A wheel at rest is rotated with a uniform angular acceleration, such that a particle on the rim of the wheel experiences a tangential acceleration of 20t ms-2. The radius of the wheel is 2 m. The instantaneous period of rotation at the end of 4 second​

Answer 1

Explanation:

Angle revolved in 1 sec and 2 sec are θ1 and θ1+θ2 respectively.

Given:  w1=0                 using  θ=21αt2

 θ1=21α(1)2

θ1+θ2=21α(2)2

Solving  we get,   θ2=23α

Thus  θ1θ2=3