Chapter 4 Energy and Matter
How many Btu per hour is equivalent to one ton of refrigeration?
12,000 Btu/hr
How much work (in foot-pounds) is required to move a block 10' if the force is 200 lb?
2,000 ft-lb
A ton of refrigeration is equal to the heat energy required to melt one ton of ice in _____________.
24 hours
Calculate the power in kilowatts (KW) required to lift a 500 kg mass 12 m in one second.
58.8 kW
Latent heat is heat added to a substance that ________.
Causes the substance to change state.
The destiny of a substance is defined as the mass of the substance ________.
Divided by its volume
The law of conservation of energy states that ______?
Energy can be changed from one form to another, energy cannot be created, energy cannot be destroyed.
True or False? Heat always flows from a substance at a lower temperature to a substance at a higher temperature.
False
If a substance has a specific gravity less than 1.0, it means that the substance is _________.
Less dense than water
Density is best described as meaning the _________.
Mass per unit of volume of a substance
The base unit for distance in the SI measurement system is __________.
Meter (m)
Objects that float on water have a __________.
Specific gravity less than 1
The _________ of a substance is the amount of heat added or released to change the temperature of 1 lb of the substance by 1°F or 1 kg of the substance by 1K.
Specific heat capacity
The temperature of the air surrounding an object is __________ temperature.
Ambient
A ton of refrigeration effect is defined as the _________.
Amount of heat energy absorbed when a ton of ice melts during one 24-hour day.
A Btu is the amount of heat required to raise one pound of water _____________.
By 1ºF
___________ is the method by which heat is transferred from one substance to another through a circulating medium, such as air or water.
Convection
The highest temperature at which a substance may liquefy, regardless of pressure, is called its _______________.
Critical temperature
The base unit for distance in the US Customary measurement system is ________.
Foot (ft)
Energy applied to matter that causes a change in the matter's velocity is called ____________.
Force
The following are the three physical states of a substance, except ________.
Force
The weight of a substance is defined as the __________.
Force of gravity acting on the substance
The base unit for mass in the SI measurement system is _______.
Gram (g)
Relative density is defined as the ratio of the mass of certain volume of a gas as compared to the mass of an equal volume of hydrogen. Knowing this concept and that density is mass per volume, a heavy gas would then have a relative density________.
Greater than 1
The following statements describe sensible heat, except ______________.
Heat that causes a change of physical state
As the amount of a substance increases, the force of gravity acting on it _________.
Increases proportionally
Poor conductors of heat are known as ____________.
Insulators
Energy can be classified into which two categories?
Kinetic and Potential
The two main classifications of energy are _________?
Potential and kinetic
The base unit for mass in the US Customary measurement system is _________.
Pound (lb)
_________ is the rate at which work is performed.
Power
The term Mass is used to express that the _________ of material is the same, regardless of the change in the force of gravity.
Quantity
Temperatures measured on the _______ scale can be converted to Fahrenheit temperatures by subtracting 460°F.
Rankine
The absolute scale that uses the same divisions as the Fahrenheit scale is the ____________ scale.
Rankine
The ratio of the mass of a certain volume of a gas as compared to the mass of an equal volume of hydrogen is called ____________.
Relative density
Heat energy can be categorized as latent heat and ________ heat.
Sensible
Enthalpy is the _________.
Total amount of heat in a substance, calculated from an accepted reference temperature.
True and False? Energy can change from one form to another.
True
