AnswersCrowley Credit Recovery Physics AHeat Transfer

First Law of Thermodynamics Answers

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

A
Q = W + U
Option A
B
Q = U – W
Option B
C
Q = U + W
Option C
D
Q = U – W
Option D
2
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Thermodynamics is the study of the relationship between thermal energy and

A
mass.
B
other forms of energy.
C
types of engines.
D
temperature.
3

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

Question illustration
A
The descriptions for intake and ignition should be switched with one another.
B
During compression, temperature does not increase, it decreases.
C
Compression happens before ignition, so it should be step 2.
D
The piston moves down, not up, during the exhaust step.
4

Which best describes a characteristic of an adiabatic process?

A
Heat is absorbed but not released by the system.
B
All heat added to the system is transformed into work.
C
There is a gradual shift between compression and expansion of a gas.
D
When gas is compressed in the system, temperature remains constant.
5

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?

Question illustration
A
Y, W, X, Z
B
X, Z, W, Y
C
W, X, Y, Z
D
Z, X, Y, W
6

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?

A
9 J
B
97 J
C
107 J
D
117 J
8

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

Question illustration
A
Kinetic energy within the system decreases and creates mechanical energy as the piston moves upward.
B
Kinetic energy within the system increases and is transformed into mechanical energy as the piston moves upward.
C
Mechanical energy within the system increases and is transformed into kinetic energy as the piston moves upward.
D
Mechanical energy within the system decreases and creates kinetic energy as the piston moves upward.
9

A steam turbine is a device in which high-pressure steam enters the turbine and causes blades to spin. The spinning blades have mechanical energy.

A
The turbine absorbs heat, which creates kinetic energy in the system and produces work to turn the blades.
B
The turbine destroys some of the thermal energy in the steam, which generates work and turns the blades.
C
The turbine generates heat from the steam, and some of the heat creates work and turns the blades.
D
Some of the heat used to make the steam is transformed into work as the steam pushes against the blades to make them turn.
10

Suppose the spark plug on a heat engine is not functioning properly. Which statement best explains how this will affect the engine?

A
The temperature of the gas will not increase during the compression stage.
B
Burned gases will not be released into the surrounding air.
C
The fuel-air mixture will not be able to enter the cylinder.
D
Combustion and subsequent gas expansion will not occur.

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