Question

O is the centre of the circular disc of mass 50 kg which rests in a vertical plane on two rough pegs A and B the coefficient of friction with each being 1/2 Ao makes 60° and BO makes 30° with the vertical. Find the maximum force F which can be applied tangentially at the highest point of the disc without causing rotation of the disc(g=10m/s^2)

Answer 1

Answer:

Correct option is

A

8

Conservation of angular momentum about vertical axis of disc

2

50(0.4)

2

×10=[

2

50(0.4)

2

+2×2(6.25)(0.2)

2

]ω

ω=8 rad/sec

NOTE: The moment of inertia for the rings will be 2mR

2

each. Because the axis will be at the circumference.

Answer 2

Answer:

275N

Explanation:

torque about all points should be zero. so equate torques at points A, B and COM .