1.
What is the gravitational force between two masses of 10 kg each separated by a distance of 1 m? (G = 6.67 × 10⁻¹¹ N m²/kg²)
A
6.67 × 10⁻⁹ N
B
6.67 × 10⁻¹⁰ N
C
6.67 × 10⁻¹¹ N
D
6.67 × 10⁻⁸ N
Answer and explanation
Correct Answer: A — 6.67 × 10⁻⁹ N
F = G × m₁ × m₂ / r² = 6.67 × 10⁻¹¹ × 10 × 10 / 1² = 6.67 × 10⁻⁹ N.