Which of the following accurately describes the role of potential energy in the hydroelectric dam? a. Potential energy is almost non-existent due to water resting in the reservoir.

b. There is no potential energy due to a lack of gravity.

c. Potential energy exists as moving water.

d. Potential energy exists due to gravity.

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.