Question

What is the smallest radius of a circle at which a bicyclist can travel if his speed is 7m/s and the coefficient of static friction between the tyres and road is 0.25.
A) 10m B) 20m C) 5m D) 15m
Ans: 20m
How?

Answer 1

Explanation:

In presence of Friction,

${v}^{2} = {erg}$

where 'e' is coefficient of friction

$r = \frac{ {v}^{2} }{eg}$

r= 49/2.5= 19.6= 20m

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Answer 2

Answer:20m

Explanation:By direct formula,

r=v^2/ug