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?

Options

A. walking on ground would became more difficult.
B. the acceleration due to gravity on earth will not change.
C. raindrops will fall much faster.
D. airplanes will have to travel muck faster.

Answer

A, C, D

Explanation

When `G = 10 G`, then `g' = ((10G)M)/(R^(2)) = 10 g`.
`:.` Weight of person` = mg' = m xx 10g = 10 mg` i.e. gravity pull on person will increase. Due to it, walking on ground would become more difficult. As circuit velocity of rain drop, `upsilon_(c ) = (2 r^(2)(rho - sigma)g)/(9eta)`
where letters have the usual meaning, so `upsilon_(c ) prop g`. Since `g` increases, hence `upsilon_(c )` increase.
To overcome the increased gravitational pull of earth, the aeroplanes will have to travel much faster.