REVIEW QUESTIONS Flashcards
What are the three states in which matter is commonly found
Solid
liquid
and gases
____________ is the term used for water when it is in the solid state
Ice
In what direction does a solid exerts force
Downward
In what direction does it liquid exerts force?
Outward
Vapor exerts pressure in what direction
All directions
Define density
Is the weight per unit of volume of a substance
Define specific gravity
Is the property used to compare the density of various substance
Describe specific volume
Is the amount of space a pound of a vapor or a gas will occupy
Why does an object weigh less on the moon then on earth
Because the moon has less gravity than earth
The density of tungsten is 1210 lb/ft. what would be its specific volume?
1 divide density
1 divide by 1210 = 0.00082645
The specific volume of red brass is 0.001865 ft/lb. what would be its density
1 divided by density
1 divided by 0.001865
Aluminum has a density of 171 lb/ft. What would be its specific gravity
????
Four pounds of a gas occupy 10 ft. What would be a total volume density and specific gravity
???
Why is information regarding the pacific volume of gases important to the designer of air conditioning heating and refrigeration equipment
????
Who’s law states that the volume of a gas various inversely with the absolute pressure as long as the temperature remains constant
Boyle’s law
At a constant pressure how does a volume of gas vary with respect to that absolute temperature
??
Describe daltons law as it relates to a confined mixture of gases
???
What are the two types of energy most frequently used or Considered in this industry
Electrical and heat energy
How were fossil fuel’s form
??
___________its the time rate of doing work
Force x distance
States the formula for determining the amount of work accomplished in a particular task
Force times distance
If an air conditioning compressor weighing 300 pounds had to be lifted 4 feet to be mounted on a base how many feet of work might be accomplish?
300 x 4 =1200
Describe horsepower and list the three quantities needed to determine horsepower
A horse power equal 33,000 lb to a height of 1 ft in 1 minute
To determine a horsepower, force x distance x time
How many watts of electrical energy are equal to one horse power
746 watts
How many BTU of heat can be produced by 4 kwh of electricity
??
How many BTU/h would be produced in a 12 KW electric heater
12x3413=40,956
What unit of energy does the power company charge the consumer for
Kilowatts-hour
Matter is a substance that Occupies space and has?
Mass
