Which of the following scenarios provides the clearest evidence that energy is active in a system?

A rock sitting still on the ground.

A glass of water at room temperature.

Which of the following scenarios provides the LEAST clear evidence of active energy transfer within the system described?

An ice cube melting on a warm sidewalk.

A car engine running while the vehicle is parked.

A phone screen lighting up during an incoming call.

A stationary bicycle parked in a garage.

To create new energy from matter.

To stop the flow of energy within a system.

To provide a visible sign that invisible energy is present and active.

To measure the exact temperature change caused by energy.

The pinwheel is creating its own energy.

Energy is present and active in the wind and pinwheel system.

The pinwheel is losing its color.

The toaster is broken and losing its metal.

The toaster is reflecting red light from the room.

Energy has been transferred to the wires, causing a change in temperature and light.

The cold air around the toaster is being converted into heat.