Does the moon make its own light?

Which two objects have the greatest gravitational force acting between them

Astudent looks at ocean waves coming into the beach. an ocean wave with more energy will a) have a greater height. b) have a greater period. c) travel toward the beach faster. d) strike the beach with greater frequency.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec