Author Question: The escape speed from the surface of the Earth is 11.2 km/s. Estimate the escape speed for a ... (Read 65 times)

ss2343 · **on:** Jul 28, 2018

The escape speed from the surface of the Earth is 11.2 km/s. Estimate the escape speed for a spacecraft from the surface of the Moon. The Moon has a mass 1/81 that of Earth and a radius 0.25 that of Earth.
a. 2.5 km/s
b. 4.0 km/s
c. 5.6 km/s
d. 8.7 km/s

Question 2

If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth, estimate the gravitational acceleration g at the surface of Mars. (gearth = 9.80 m/s2)
a. 2.20 m/s2
b. 3.73 m/s2
c. 4.20 m/s2
d. 5.50 m/s2