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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

(a) `7.5N`

B

(b) `8.6N`

C

(c) `11.5N`

D

(d) `22.5N`

Text Solution

Verified by Experts

The correct Answer is:
A
`N-mg cos 60^@=(mv^2)/(R)`
`N=5+5/2=7.5N c`
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