Two point masses and are separated by a distance and attract each other with a force

PHYSICS · Subjective · CBSE · Physics · Gravitation · Gravitation

Problem

Two point masses

m

and

9m

are separated by a distance

d

and attract each other with a force

F

. (i) Write the expression for

F

in terms of

m

d

and the universal constant. (ii) The larger mass is replaced by

4m

and the separation is reduced to

\tfrac{d}{2}

. Calculate the new gravitational force

F'

in terms of

F

. (iii) Evaluate

F'

when

F = 2.0\times10^{-5}\,\text{N}

m = 0.50\,\text{kg}

and

d = 0.40\,\text{m}