Question

floor. Why?
3. Explain why the value of g is zero at
the centre of the earth.
4. Let the period of revolution of a planet
at a distance R from a star be T. Prove
that if it was at a distance of 2R from
the star, its period of revolution will be
V8 T.
Solve the following examples.
a. An object takes 5 s to reach the grond
from a height of​

Answer 1

Answer:

ANSWER

At the centre of Earth, the force due to upper half of the Earth will cancel the force due to lower half. In the similar manner, force due to any portion of the Earth at the centre will be cancelled due to the portion opposite to it. Thus, the gravitational force at the centre on any body will be 0. Since, from Newton's law, we know F=mg. Since, mass m of an object can never be 0. Therefore, when F=0, then g has to be 0. Thus, the value of g is zero at the centre of Earth.