Physics

Grade-10

Easy

Question

# A motorcyclist rides in a vertical circle in a hollow sphere of radius 14 m. Find the minimum speed required so that he does not lose contact with the sphere at the highest point.

- 12 m/s
- 14 m/s
- 11 m/s
- 16 m/s

Hint:

## The correct answer is: 12 m/s

### Radius of the sphere, r = 14m

Minimum speed, v = ?

At the highest point the centrifugal force and weight of the motorcyclist are equal in magnitude.

Minimum speed of the motorcycle = 11.2m/s

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