Last one: Every object in the universe attracts every other object
Answer:

Explanation:
I = Moment of inertia of sphere = 
M = Mass of sphere = 29 kg
R = Radius of sphere = 0.5 m
T = Time taken for one revolution = 0.5 s
= Angular velocity = 

The rotational angular momentum of the sphere is
.
Mars.
Mars is the furthest away from the Sun so therefore has a longer journey to make to complete a full orbit (solar year)
if it moves 7m/s, that means every second it goes 7m. Now we just multiply by the time (20 seconds) and end up with 140m.