Author Question: A spaceship of mass m circles a planet (mass = M) in an orbit of radius R. How much energy is ... (Read 160 times)

lidoalex · **on:** Jul 28, 2018

A spaceship of mass m circles a planet (mass = M) in an orbit of radius R. How much energy is required to transfer the spaceship to a circular orbit of radius 3R?
a. GmM/(2R)
b. GmM/(3R)
c. GmM/(4R)
d. GmM/(6R)
e. 3GmM/(4R)

Question 2

An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution?
a. 4 years
b. 8 years
c. 16 years
d. 32 years
e. 64 years