What does the first law of thermodynamics describe?

• Energy creation

• Energy conservation

• Energy destruction

• Energy multiplication

What is the formula for the first law of thermodynamics?

• Q = ΔU - W

• Q = ΔU + W

• Q = ΔU / W

• Q = ΔU * W

In the formula Q = ΔU + W, what does Q represent?

• Work done by the gas

• Change in internal energy

• Heat energy added

• Energy lost

In the formula Q = ΔU + W, what does W represent?

• Heat energy added

• Work done by the gas

• Change in internal energy

• Energy conserved

In the formula Q = ΔU + W, what does ΔU represent?

• Heat energy added

• Work done by the gas

• Change in internal energy

• Energy destroyed

In a heat engine, what is the term for the place where heat energy is lost?

• Heat source

• Heat sink

• Heat receiver

• Heat generator

What is the relationship between Q_in, Q_out, and W in a complete cycle of a heat engine?

• Q_in + Q_out = W

• Q_in - Q_out = W

• Q_out - Q_in = W

• Q_in x Q_out = W

What does the second law of thermodynamics imply about the need for a heat source and heat sink?

• They are optional

• They are necessary

• Only the heat source is needed

• Only the heat sink is needed