Q.
A man having a wrist watch and a pendulum clock rises on a $TV$tower. The wrist watch and pendulum clock by chance fall from the top of the tower. Then
A) Both will keep correct time during the fall
B) Both will kept incorrect time during the fall
C) Wrist watch will keep correct time and clock will become fast
D) Clock will stop but wrist watch will function normally
Explanation
(d) Function of wrist watch depends upon spring action so it is not effected by gravity but pendulum clock has time period, $T = 2\pi\sqrt{\frac{l}{g}}.$ During free fall effective acceleration becomes zero, so time period comes out to be infinity, $i.e.,$ the clock stops
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.