First Law of Thermodynamics

Question 1

In the formula used to solve problems related to the first law of thermodynamics, what does Q represent?

Revolt · Accepted Answer

heat

Question 2

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

Revolt · Accepted Answer

160 J

Question 3

Thermodynamics is the study of the relationship between thermal energy and

Revolt · Accepted Answer

other forms of energy.

Question 4

A system uses 49 J of energy to do work, and the change in internal energy is 58 J. How much heat was added to the system?

Revolt · Accepted Answer

107 J

Question 5

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 6

Which formula can be used to solve problems related to the first law of thermodynamics?

Revolt · Accepted Answer

Q = U + W

Question 7

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

Revolt · Accepted Answer

Its temperature decreases.

Question 8

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

Question 9

Question 18

Revolt · Accepted Answer

480

Question 10

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

First Law of Thermodynamics Answers