Question

If the mass of a planet is eight times the mass of the earth and its radius is twice the radius of the earth, what will be the escape velocity for that planet?

Answer 1

Given:

(1) The mass of the planet (M) is eight times the mass of the earth, i.e., 8 × 6 × 10²⁴ kg

(2) The radius of the planet (R) is twice the radius of the earth, i.e., 2 × 6.4 × 10⁶ km

(3) G = 6.67 × 10^-11 N·m²/kg²

Escape velocity for that planet

= 2.237 × 10⁴ m/s

= 22.37 km/s