Question 9.
Solve the following problems.
If 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:
Mass of planet M = 8 x mass of earth = 8 x 6 x 1024 kg
Radius of planet R = 2 x radius of earth = 2 x 6.4 x 106 m
G = gravitational constant = 6.67 x 10-11 N m2/kg2
So escape velocity = √
Escape velocity =
= 22.4 km/sec.
So escape velocity of the planet will be 22.4 km/sec.