A ball that is thrown upwards has a store of kinetic energy as it leaves the person's hand. Describe the change in energy stores as the ball rises and falls again. (Please try to be as clear as you can).

Positrons are spontaneously emitted from the nuclei of

If the area of a square has increased by a factor of 16, by how much has each side increased?

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume