Question

What is the force between two spheres weighing 20kg each and placed 50 cm apart

Answer 1

The answer to this question is following:

m₁=m₂=20kg

r=50cm or 0.5m

G= 6.67 x 10⁻¹¹

formula of force  

F= G m₁m₂/r²

=6.67 x 10⁻¹¹ x 20 x 20/ 0.5

=1.067 x 10⁻⁷

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Answer 2

Given,

m₁ = m₂ = 20 kg

r = 50cm = 0.5 m

We know that, According  to newton's  law of gravitation , Force  between two masses of  m₁ and m₂ which is placed  r m apart is,

$F=G\;\frac{m_1m_2}{r^{2}}\\ \\F=6.67\times11^{-11}\;\frac{20\times\;20}{0.5\times0.5}\\ \\F = \frac{2668}{0.25}\times10^{-11}\\ \\F=1.0672\times10^{-7}\;N$