Question

A boy is sitting on the horizontal platform of a joy wheel at a distance of $5m$ from the center. The wheel begins to rotate and when the angular speed exceeds $1rad/s$, the boy just slips. The coefficient of friction between the boy and the wheel is $\left(g=10m/s^2\right)$

• A. 0.5
• B. 0.32
• C. 0.71
• D. 0.2

Answer 1

Answer: (A)

$\frac{v^2}{r}={\omega }^{2}r=\mu g$
$m=0.5$