Question

Heat transfer Q and work done W are always energy in transit, whereas internal energy Eint is energy stored in a system. Give an example of each type of energy, and state specifically how it is either in transit or resides in a system.

a) Heat transfer: boiling water on a stove; Work done: lifting a weight; Internal energy: charged battery.

b) Heat transfer: sunlight on solar panels; Work done: stretching a rubber band; Internal energy: compressed spring.

c) Heat transfer: melting ice with a blowtorch; Work done: pedaling a bicycle; Internal energy: wound-up clock.

d) Heat transfer: burning wood in a fireplace; Work done: stirring a pot; Internal energy: rotating fan.

Answer 1

Heat transfer (Q) and work done (W) are forms of energy in transit, while internal energy (U) is energy stored in a system. Examples of each type of energy include boiling water on a stove (heat transfer), lifting a weight (work done), and a charged battery (internal energy).

Step-by-step explanation:

Heat transfer (Q) and work done (W) are both forms of energy in transit, while internal energy (U) is energy stored in a system.

1. Heat transfer: Boiling water on a stove. In this example, heat energy is transferred from the stove to the water, causing the water to increase in temperature and eventually boil.
2. Work done: Lifting a weight. When you lift a weight, work is done on the weight by applying a force through a distance.
3. Internal energy: A charged battery. In this case, the energy is stored in the chemical reactions happening inside the battery.