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A force F required to keep a 5 kg mass moving round a cycle of radius 3.5...

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Question 39

A force F required to keep a 5 kg mass moving round a cycle of radius 3.5 m at a speed of 7 ms^-1. What is the speed, if the force is tripled?

A

4.0 ms^-1

B

6.6 ms^-1

C

12.1 ms^-1

D

21.0 ms^-1

Explanation

Share Answer The force which is centripetal
F = MV²_R
=5 x 7²3.5
= 70
V = (Fr) and if F is tripped, then
V = (3Fr)/m
= (3x70x3.5)/5
= 12.1ms^-1

Correct option: C

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