An object of mass 10 kg falls from the top of a building 10 m high and lands on the ground below.  How much work was done by the force of gravity?

What is energy?

Question 1 options:

a) energy is force per unit area
b) energy is pressure times distance
c) energy is force times displacement
d) energy is heat delivered per unit time


Question 2 (1 point)


When an automobile stops for a stoplight, its kinetic energy

Question 2 options:

a) is converted to thermal energy.
b) completely disappears.
c) is transferred to the pavement.
d) is stored in the automobile’s battery.


Question 3 (1 point)


An object of mass 10 kg falls from the top of a building 10 m high and lands on the ground below.  How much work was done by the force of gravity?

Question 3 options:

a) 0 J
b) 98 J
c) 100 J
d) 980 J


Question 4 (1 point)


At our present rate of use, the estimated total remaining recoverable petroleum of the U.S. would supply our needs for  about ________ years.

Question 4 options:

a) 72
b) 48
c) 20
d) 8


Question 5 (1 point)


The U.S. is using liquid petroleum at a rate of about

Question 5 options:

a) 20 million gallons per day
b) 20 million barrels per day
c) 20 million barrels per week
d) 20 million gallons per week


Question 6 (1 point)


A reasonable estimate for Q_infinity(petroleum) for the world is

Question 6 options:

105 million gallons
105 billions gallons
105 trillion gallons
105 quadrillion gallons


Question 7 (1 point)


The total annual energy consumption in the  U.S. is about _______ QBtu, and this is about ______ tons of coal per year for each person in the U.S.

Question 7 options:

a) 80, 13
b) 800, 130
c) 8000, 1.4
d) 98, 13


Question 8 (1 point)


The estimated total minable coal in the United States is about

Question 8 options:

a) 275 billion tons
b) 500 million tons
c) 500 billion tons
d) 1.5 trillion tons


Question 9 (1 point)


If you burned 10 pounds of coal to release the heat, how many pounds of wood would your friend have to burn to release the same amount?

Question 9 options:

a) 10 lbs
b) 12.75 lbs
c) 16.25 lbs
d) 8.0 lbs


Question 10 (1 point)


How many Btu’s are there in one kilowatt-hour?

Question 10 options:

a) 4220
b) 3413
c) 2110
d) 1055


Question 11 (1 point)


A horizontal force of 80 pounds is exerted on a box which moves the box 10 feet across a horizontal floor in 5 seconds.  What is the power generated by this force?

Question 11 options:

a) 0.66 hp
b) 0.51 hp
c) 0.34 hp
d) 0.29 hp


Question 12 (1 point)


In the U.S. we currently import more than _______ of the oil that we consume.

Question 12 options:

a) 10%
b) 50%
c) 33%
d) 66%


Question 13 (1 point)


What is a reasonable number for the years remaining until the world’s oil supply is completely depleted?

Question 13 options:

a) 10
b) 50
c) 100
d) 200


Question 14 (1 point)


What is coal, mostly?  And which type gives off the most heat when burned?

Question 14 options:

a) carbon, bituminous
b) carbon, anthracite
c) hydrocarbons, lignite
d) hydrocarbons, subbituminous


Question 15 (1 point)


Approximately how much coal is produced each year in the U.S.?

Question 15 options:

a) 1 million tons
b) 1 billion tons
c) 1 trillion tons
d) 2 quadrillion tons


Question 16 (1 point)


When a magnet is moved within or near a conducting coil an electrical current is induced in the coil of wire.  Who discovered this?

Question 16 options:

a) Franklin
b) Edison
c) Maxwell
d) Faraday


Question 17 (1 point)


Your house foundation and ground floor is made up of 1000 cubic feet of concrete.  About how many Btu are required to raise the temperature of the foundation and floor by 25 degrees F? Given:  22 Btu per cubic feed per degreee F for concrete.

Question 17 options:

a) 55,000 Btu
b) 220,000 Btu
c) 250,000 Btu
d) 550,000 Btu


Question 18 (1 point)


What is the typical voltage output of an individual solar cell?

Question 18 options:

a) 0.5 volt
b) 5 volt
c) 9 volt
d) 24 volts


Question 19 (1 point)


Hydroelectric power in the U.S. currently represents about _______% of the total U.S. electricity.

Question 19 options:

less than 1


Question 20 (1 point)


A windmill system which produces 6 kW of electrical power when the wind is blowing 5 m/s will produce _______ kilowatts when the wind is blowing 10 m/s?

Question 20 options:

a) 72
b) 36
c) 48
d) 12


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