Question

• Two equal and opposite forces are applied
tangentially to a uniform disc of mass M and radius
Ras shown in the figure. If the disc is pivoted at
its centre and free to rotate in its plane, the
angular acceleration of the disc is
2F
(2) 3MR
(4) Zero​

Answer 1

◆【Solution 】◆

As you not mention the point of action of both force so I propose two possible cases so that you find your answer.

● Case I

When point of action is a common point.

In this case the torque by one force is equal to the torque applied by other force hence balance each other.

So there is no angular Acceleration.

● Case II

When point of action is separate by 2R diatance.

In this case both the force help to generate angular Acceleration.

Force = F

Radius = R

Mass = m

Moment of inertia = mR²/2

Angular acceleration = A

Acc to NLM

F.R + F.R = IA

2F.R = (mR²/2)A

●【4F/(mR) = A】●

#answerwithquality

#BAL