Most solar hot water systems are fitted with gas or electric "boosters" that can also heat the water. Describe why you think these are necessary.

DUE IN 2 HOURS PLEASE HELP!!

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

The graph represents the distance a car travels over time while on the highway. which statement about the car's trip is accurate? a) the car does not move over time. b) the car travels at a constant velocity. c) the car's velocity increases constantly over time. d) the car's velocity decreases constantly over time.