Objective 04: 1st and 2nd Law of Thermodynamics

Question 1

Heat

Answer 1

The energy associated with the motion of molecules within a body

Question 2

Temperature

Answer 2

An indication of the heat intensity in a body

Question 3

Considering what it indicates, what information does temperature provide an engineer?

Answer 3

1. The direction of heat transfer to or from the body under consideration
2. The rate of heat transfer between bodies of different temperatures
3. The material requirements for particular services

Question 4

What happens to the temperature of 2 substances at different temperatures that come into contact with each other?

Answer 4

Their temperatures equalize as heat is transferred from the hotter object to the colder one

Question 5

1st Law of Thermodynamics

Answer 5

Work and heat are mutually convertible

Question 6

What happens to a system when work is applied UPON it?

Answer 6

There is a corresponding increase in the internal energy of the system and therefore increase in temperature

Question 7

What happens to a system when work is applied BY it?

Answer 7

There is a corresponding decrease in the internal energy and decrease in temperature

Question 8

2nd Law of Thermodynamics

Answer 8

External work must be done to transfer heat from a lower temperature system to a higher temperature system