Lesson 5: First Law of Thermodynamics

Question 1

What variables are represented by the formula for the first law of thermodynamics? Check all that apply.internal energychemical energyelectrical energyheatwork

Revolt · Accepted Answer

internal energy; heat; work

Question 2

123✔ 4

Revolt · Accepted Answer

✔ 4

Question 3

12✔ 34

Revolt · Accepted Answer

✔ 3

Question 4

✔ 1234

Revolt · Accepted Answer

✔ 1

Question 5

Heat is created, but not destroyed or transformed.✔ Heat is transformed, but not created or destroyed.Heat is destroyed, but not created or transformed.

Revolt · Accepted Answer

✔ Heat is transformed, but not created or destroyed.

Question 6

A system absorbs 52 joules of heat and does work using 25 joules of energy. What is the change in the internal energy of the system?

Revolt · Accepted Answer

27 joules

Question 7

⇒ 12

Revolt · Accepted Answer

99112

Question 8

⇒ 53

Revolt · Accepted Answer

99113

Question 9

Which describes the adiabatic process? Check all that apply.Heat is released from the system.Heat is not absorbed by the system.A rapid shift occurs between gas compression and expansion.A rapid expansion of gas is caused by a temperature decrease.All heat is transformed to work done by the system.

Revolt · Accepted Answer

Heat is not absorbed by the system.; A rapid shift occurs between gas compression and expansion.; All heat is transformed to work done by the system.

Question 10

These steps are involved in the production of work by a four-stroke heat engine. Place the steps in the correct order.

Revolt · Accepted Answer

✔ 2; Piston moves up, compressing gas and causing gas to increase its temperature:: 2; Piston moves up, pushing burned gases through exhaust valve:: 4; Spark plug fires, causing combustion as gas is still compressed; increase in energy from combustion pushes piston down:: 3; Piston moves down, allowing fuel-air mixture to enter intake valve:: 1

Lesson 5: First Law of Thermodynamics Answers

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