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A small block of mass 1 kg is a circula...

A small block of mass `1` kg is a circular are of ratius `40` m . The block sides along the track without topping and a frictionnal force acts on it in the direction opposite in the instrmens velocity . The work done in evercoming the friction up to the point `Q` as shown is the figure below is `150 J`
(Take the acceleration due to gravity `g = 10 ms^(-2))`

The magnitude of the normal reaction that acts on the block at the point `Q` is

A

7.5 N

B

8.6 N

C

11.5 N

D

22.5 N

Text Solution

Verified by Experts

The correct Answer is:
A
`N - mg cos 60^@ = (m v^2)/R , N = 5 + 5/2 = 7.5 N`.
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