A1000.-kilogram roller coaster goes down a hill that is 90. meters tall. its speed at the bottom is 40. m/s. a. what is the efficiency of the roller coaster? assume it starts from rest at the top of the hill., b. what do you think happens to the “lost” energy? ,c. use the concepts of energy and efficiency to explain why the first hill on a roller coaster is the tallest

What process did darwin’s book suggest that organisms evolve through

Which prefix mean under less or below

Abeaker of water was heated and then placed on a bench in the laboratory. the water cooled until it was the same temperature as the air in the laboratory. which of these explains the mechanism by which the water cooled? a. heat energy was transferred from the water to the air. b. water molecules from the water formed warm water currents. c. the water molecules absorbed energy from the molecules in the air. d. the water released radiation until it contained no heat energy.