First Law of Thermodynamics

Question 1

Three hundred joules of heat are added to a system. The system uses 140 joules to do work.

Revolt · Accepted Answer

160 J

Question 2

The diagram shows a closed system before and after heat is added to it.

Revolt · Accepted Answer

Kinetic energy within the system increases and is transformed into mechanical energy as the piston moves upward.

Question 3

During an adiabatic process in a closed system, what happens to a gas when the gas expands?

Revolt · Accepted Answer

Its temperature decreases.

Question 4

The diagrams show the four primary steps in the production of work in a four-stroke heat engine.What is the correct order in which these steps occur?

Revolt · Accepted Answer

Z, X, Y, W

Question 5

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.

Revolt · Accepted Answer

conserved

Question 6

Sienna made a chart listing the steps that describe how a four-stroke heat engine operates.Which best describes Sienna’s error?

Revolt · Accepted Answer

Compression happens before ignition, so it should be step 2.

Question 7

Which best describes a characteristic of an adiabatic process?

Revolt · Accepted Answer

All heat added to the system is transformed into work.

Question 8

In an adiabatic process, the greater the compression of a gas, the greater the pressure of that gas. Based on this information, which graph best shows the relationship between the pressure and temperature of a gas?

Revolt · Accepted Answer

A graph with temperature on the x axis and pressure on the y axis. The graph is a diagonal line from the origin with a slope of 1.

Question 9

A piston uses 32 J of energy to do work as 68 J of heat are added to the cylinder of the piston. The change in internal energy of the system is J.

Revolt · Accepted Answer

36

First Law of Thermodynamics Answers

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