Physcial Science Unit II
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Physcial Science Unit II
Temperature Heat Waves Optics Wave Effects Electricity Magnetism
A change of 100 degrees on a Celsisus scale is equal to how much on a Fahrenheit scale?
0 degrees on a Celsius scale corresponds to what reference point?
The ice point
The amount of heat required to raise 1 kg of water by 1 degree Celsius is called
The amount of heat requred to raise 1 kg of any substance by 1 degree Celsius is called
The specific heat
The amount of heat required to produce a phase change for 1 kg of any substance at the melting point is called
Latent Heat of Fusion
The first law of thermodynamics is based on
The law of conservation of energy
Applying the first law of thermodynamics to a gas in a cylinder with a movable piston and assuming the gas itself remains at a constant temperature, any heat added to the gas would produce
work done by the gas to move the piston
The 2nd law of thermodynamics implies that
Heat can be utilized to do work only if a thermal reservoir at a lower temperature is available.
Applying the 2nd law of thermodynamics to a fridge, we should expect that
Energy must be supplied to it or it won't cool
The ideal efficiency of a heat engine is dependent on
The temperature of the hot reservoir and the cold reservoir between which the engine operates
How close have scientists come to reaching an absolute zero on the Kelvin temperature scale?
To within about one-billionth of a Kelvin
Insulating houses by filling the space between the inside and outside walls with a material such as fiberglass is done mainly to reduce heat transfer through the space by
Conduction and Convection
Which process is due primarily to convection?
The flowing of air from over cool water toward a warmer land area
The amount of heat that flows from one solid body at a high temperature to another at a lower temperature is NOT influenced by
The difference between their specific heats
Radiation is the only possible means of energy transfer in
Outer space, where all matter is essentially absent
Heat would escape most readily through the high vacuum reg between the double walls of an unsilvered thermos bottle by
Heat is transerred through solids primarily by the process of
If very high temperatures cause the electrons to be separated from individual atoms and molecules, the material is then said to be in what phase?
When material is found to have a definite volume, but no definite shape, and when it assumes the shape of any container its placed in, it is in what phase?
If heat is added to a substance, but the temperature of that substance doesn't increase, we can conclude that the substance is
undergoing a phase change
The kinetic theory involves the motion of
small, independent, indivisible particles (molecules)
In SI units, pressure is expressed in N/Msquared or
The ideal gas law deals with
Volume, pressure, and temperature changes in gas samples
When the temperature of a car tire increases as you drive on a long trip, the pressure in the tire should
increase as long as the volune doesn't change