Q. A boy on a cycle pedals around a circle of $20\ metres\ $radius at a speed of $20\ metres/sec$. The combined mass of the boy and the cycle is $90\ kg.$The angle that the cycle makes with the vertical so that it may not fall is $(g = 9.8\ m/sec^{2})$

A) $60.25{^\circ}$
B) $63.90{^\circ}$
C) $26.12{^\circ}$
D) $30.00{^\circ}$
Explanation

(b) $\tan\theta = \frac{v^{2}}{rg} = \frac{400}{20 \times 9.8} \Rightarrow \theta = 63.9{^\circ}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.