A50 kg student climbs 3m to the top of a set of stairs. calculate the change in the student’s gravitational potential energy from the bottom to the top of the stairs.

Sublimation- which change of state is shown in model

Answer the above statement is ( false );

The  moon has  insufficient gravity to retain an  atmosphere. we conclude that the moon has no atmosphere  because its gravitational field is too weak to  have  retained any  atmosphere  that it had over times comparable to the age of the solar system.