Question

4 multiple choice 10 points what type of energy is at its maximum at the highest point of a roller coaster? kinetic energy thermal energy gravitational potential energy elastic potential energy 5 multiple choice 10 points on a summer day, the sun heats the ground, and the ground heats the air above it. what type of heat transfer is involved? reflection conduction convection radiation

Explanation:

For the first question, at the highest point of a roller - coaster, the height is maximum. Gravitational potential energy is given by $U = mgh$ (where $m$ is mass, $g$ is gravitational acceleration, and $h$ is height), so gravitational potential energy is maximum. For the second question, when the ground heats the air above it, warm air rises and cooler air moves in to take its place, which is the process of convection.

Answer:

1. C. gravitational potential energy
2. C. Convection