On a dry road the coefficient of friction is µ and the maximum safe speed on a circular path is 10 m/s. If the road becomes wet and the coefficient becomes µ/2, find the new maximum safe speed.
Options

Question

On a dry road the coefficient of friction is µ and the maximum safe speed on a circular path is 10 m/s. If the road becomes wet and the coefficient becomes µ/2, find the new maximum safe speed.

G1 Physics · Accepted Answer

Maximum level-road speed satisfies v(max)∝√µ. When µ becomes µ/2, v'=10√(1/2)=5√2 m/s. Hence A.