Question
Which of the following observations point to the equivalence of inertial and gravitational mass.
- Two spheres of different masses dropped from the top of a long evacuated tube reach the bottom of the tube at the same time.
- The time-period of a simple pendulum is independent of its mass.
- The gravitational force on a particle inside a hollow isolated sphere is zero.
- For a man in closed cabin that is falling freely under gravity, gravity ‘disappears’.
Solution
C.
The gravitational force on a particle inside a hollow isolated sphere is zero.
