T or F:
The energy an object has because of its position is called potential energy.
True.
T or F:
The increase in potential energy caused by lifting an object can be calculated by multiplying its weight by its change in height.
True.
T or F:
Your electric bill for 1500 kilowatt-hours is a charge for the power you have used that month.
False
T or F:
Plants convert radiant energy from the Sun into chemical energy by a process called photosynthesis.
True.
T or F:
Nearly all of the energy consumed today is provided by petroleum, coal, hydropower and nuclear sources.
True.
The watt (W) is a unit of…
Power.
Which one of the following has an appropriate unit?

work – joule
force – newton
power – watt
All of the above.

All of the above.
Kinetic energy refers to…
energy in motion.
Which solar technology makes economic sense for a homeowner?
water heating.
What form of energy does not require matter for traveling through space?
radient.
Roughly, what fraction of our nation’s current energy needs is supplied by coal?
20%
Energy sources used today are mostly in what form of energy?
Chemical.
T or F:
Molecules are the smallest units of matter that retain the characteristic properties of a substance.
True.
T or F:
Water beads up on wax paper because its cohesive forces are greater than the adhesive forces.
True.
T or F:
Temperature is a measure of the amount of heat stored in a substance.
False.
T or F:
The molecules of a gas are much farther apart than molecules in a solid or liquid.
True.
T or F:
A liquid at 20ºC is twice as hot as the liquid at 10ºC.
False.
T or F:
The degrees on the Celsius scale are larger than degrees on the Fahrenheit scale.
True.
T or F:
The nutritionist’s Calorie is really a kilocalorie.
True.
What is the average temperature of healthy humans on the Celsius scale?
37º
Molecules in a solid…
are held in nearly fixed positions by strong attractive forces.
When water vapor condenses to a liquid…
it transfers heat to the surroundings.
Your body judges temperature…
very poorly, sensing only heat flow.
The heat needed to warm one gram of water one Celsius degree is called a…
calorie.
Water molecules move back and forth between the liquid and gaseous phases…
at all times.
The transfer of heat that occurs when energy moves from molecules to molecule is called…
conduction.
Adding heat to a substance…
sometimes does not result in a temperature change.
The heat death of the universe is a theoretical time in the future when the universe is supposed to…
freeze at a uniform low temperature.
Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy?
second law of thermodynamics
x

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