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Two objects attract each other gravitationally with a force of [tex]$5.0 \times 10^{-10} \, \text{N}$[/tex] when they are 0.20 m apart.

If the mass of one object is 2.00 kg, what is the mass of the other object?

Answer :

M2 = 0.665 kg

The mass of other object is 0.665 kg

Solution:

To solve this, we must apply Newton's law of universal gravitation, which states that the force of gravity between two massive bodies 1, 2, is proportional to their masses M1 and M2 and inversely proportional to the square of the distance d between them:

F = (GM1M2) / D²

Here G = 6.67 × 10⁻¹¹ Nm²/kg²

F = 50×10⁻¹⁰N

M1 = 2.00kg

D = .20 m

by substituting values ,

50×10⁻¹⁰N =(( 6.67 × 10⁻¹¹ Nm²/kg²)(2.00kg)M2) / (.20 m)²

50×10⁻¹⁰ = 1.334 × 10⁻¹⁰ M2 /( .20)²

(50×10⁻¹⁰) (.20)² = 1.334 × 10⁻¹⁰ M2

2 ×10⁻¹⁰ = 1.334 × 10⁻¹⁰ M2

M2 = 1.334 × 10⁻¹⁰ / 2 ×10⁻¹⁰

M2 = 0.665 kg

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