Suppose a spacecraft orbits the moon in a very low, circular orbit, just a few hundred meters above the lunar surface. the moon has a diameter of 3500 km, and the free-fall acceleration at the surface is 1.6m/s2. how fast is this spacecraft moving?
a. 53 m/s
b. 75 m/s
c. 1700 m/s
d. 2400 m/s

Spacecraft will be moving in 1700 m/s.

Option C

The diameter of the moon is 3500 km and the free fall acceleration at the surface is given as  

The radius will be half of the diameter of the moon that can be written as:  

By the application of the equation for orbit speed, we get  

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.