Question

The least coefficient of friction for an inclined plane at an inclined angle alpha with horizontal, in order that a solid cylinder will roll down without slipping is:
A.2/3tan alpha
B. 2/7 tan alpha
C. 1/3tan alpha
D 4/3 tan alpha

Answer 1

Answer:

(c) is the correct mark as brainliest answers

Answer 2

Answer:

Explanation:

Acceleration of point A must be zero due to pure rolling.

Thus  mgsinα−f=0        for point A

mgsinα−μmgcosα=0

⟹μ=tanα