First Law of Thermodynamics Answers
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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.2
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In the formula used to solve problems related to the first law of thermodynamics, what does Q represent?
A
internal energyB
heatC
workD
external energy3
During an adiabatic process in a closed system, what happens to a gas when the gas expands?
A
Its temperature increases.B
Its temperature decreases.C
Its molecules gain mass.D
Its molecules lose mass.5
Three hundred joules of heat are added to a system. The system uses 140 joules to do work.
A
140 JB
160 JC
240 JD
440 J6
Which formula can be used to solve problems related to the first law of thermodynamics?
A
Q = W + U
B
Q = U – WC
Q = U + WD
Q = U – W7
Sienna made a chart listing the steps that describe how a four-stroke heat engine operates.Which best describes Sienna’s error?
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.10
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 JB
97 JC
107 JD
117 JDid you find these answers helpful?
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