Question

Planet Krypton has 2 times the radius and 2 times the mass of the Earth. What is the best estimate for the magnitude of the gravitational field at the surface of planet Krypton in m/s2?

A. 20m/s^2
B. 10m/s^2
C. 5m/s^2
D. 2.5m/s^2

Answer 1

Answer:
`1.25`
`(m)/(s^2)`

Explanation:

Khan

Answer 2

9514 1404 393

Answer:

C. 5 m/s^2

Explanation:

The force due to gravity is proportional to the mass and inversely proportional to the square of the radius. So, Krypton's gravity in relation to Earth's is ...

(2)/(2^2) = 1/2

Earth's surface acceleration due to gravity is about 10 m/s^2, so 1/2 that is about 5 m/s^2. (Choice C)