Question

Two spheres having mass 10 kg each and distance 50 cm apart. Calculate gravitational force between them.

Answer 1

Here,
m1 = 10 kg
m2 = 10 kg
d = 50 cm = 50/100 m = 0.5 m

And, we know that,
G = 6.7 × 10^-11

Now,
According to universal law of gravitation,

$f = \frac{G \times m1 \times m2}{ {d}^{2} }$
$f = \frac{6.7 \times {10}^{ - 11} \times 10 \times 10 }{ {0.5}^{2} }$
$f = \frac{6.7 \times {10}^{ - 11} \times {10}^{2} }{0.25}$
$f = \frac{6.7 \times {10}^{ - 11 + 2} }{0.25}$
$f = \frac{6.7 \times {10}^{ - 9} }{0.25}$
$f = 26.8 \times {10}^{ - 9}$
Therefore, gravitational force between two objects of mass 10 kg and distance between them 50 cm is 26.8 × 10^-9 N.

That's your answer.

Hope it'll help.. :-D