Question

If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct ?

• A. 'g' on the Earth will not change.
• B. Raindrops will fall faster
• C. Time period of a simple pendulum on the Earth would decrease.
• D. Walking on the ground would become more difficult.

Answer 1

Answer: (A)

$g=\frac{GM}{R^2}$
$g$ is depends in ' $G$ ', hence ' $g$ ' will change.
Hence raindrops will fall faster and walking on ground will more difficult.
Time period $\propto \frac{1}{\sqrt{g}}$, hence " $T$ ' decreases.