Question

What is the force of gravity between Earth (6.0 × 1024 kilograms) and Venus (4.88 × 1024 kilograms)? The distance between the two planets is about 3.8 × 1010 meters. (The value of G is 6.673 × 10-11 newton meter2/kilogram2. The mass of Earth is 5.98 × 1024 kilograms.)
A. 13.52 newtons
B. 51.39 newtons
C. 13.52 x 10^17 newtons
D. 51.39 x 10^17 newtons

Answer 1

Calling Me the Earth's mass, Mv Venus mass, and d the distance between the two planets, the gravitational force between them is:
$F=G \frac{M_e M_v}{d^2}=(6.67 \cdot 10^{-11}) \frac{(6\cdot 10^{24}kg)(4.88 \cdot 10^{24}kg)}{(3.8 \cdot 10^{10}m)^2} =13.52 \cdot 10^{17}N$

so, correct answer is C).