Chapter 1 Flashcards
“Smart rocks” are considered for
A. Geologic dating
B. Ballistic missile defense
C. Nuclear Power
D. Solar Power
B. Ballistic missile defense
One watt is equivalent to:
a. one joule / second
b. one coulomb / second
c. one calorie / second
d. one horsepower
a. one joule / second
The asteroid that killed the dinosaurs exploded because
a. it was made of explosive material
b. it was made out of U-235
c. it got very hot from the impact
d. It didn’t explode, it knocked the earth out of its normal orbit.
c. it got very hot from the impact
Kinetic energy can be measured in:
a. watts
b. calories
c. grams
d. amperes
b. calories
For each of these mark whether it is a unit of energy (E) or power (p):
a. horsepower
b. kilowatt-hour
c. watt
d. calorie
P a. horsepower
E b. kilowatt-hour
P c. watt
E d. calorie
Hybrid vehicles run on:
a. electric and solar power
b. solar power and gasoline
c. electric power and gasoline
d. nuclear power and gasoline
c. electric power and gasoline
What is the main reason that hydrogen-driven automobiles have not replaced gasoline ones?
a. Hydrogen is too expensive
b. hydrogen is too difficult to store in an automobile.
c. hydrogen is radioactive, and the public fears it
d. hydrogen mixed with air is explosive.
b. hydrogen is too difficult to store in an automobile.
Which of the following statements is true?
a. energy is measured in joules, and power is measured in calories.
b. power is energy divided by time.
c batteries release energy, but tnt releases power.
d. power signifies a very large value of energy
e. all of the above
b. power is energy divided by time.
Compared to an equal weight of gasoline, U-235 can deliver energy that is greater by a factor of (Closet value)
a. 2200
b. 25,000
c. one million
d. one billion
c. one million
Which of the following contains the most energy per gram?
a. tnt
b. chocolate chip cookies
c. battery
d. uranium
d. uranium
Compare the energy in a kilogram of gasoline to that in kilogram of flashlight batteries:
a. gasoline has about 400 times as much energy
b. gasoline has about 10 times as much energy
c. gasoline has about 70 times more energy
d. they cannot be honestly compared, since one stores power and the other stores energy.
c. gasoline has about 70 times more energy
Which is least expensive- for the same energy delivered?
a. coal
b. gasoline
c. natural gas
d. AAA batteris
a. coal
The kinetic energy of a typical 1 gram meteor is approximately equal to the energy of
a. 10 grams of tnt
b. 150 grams of tnt
c. 1/100 grams of tnt
d. 10 grams of gasoline
b. 150 grams of tnt
d. 10 grams of gasoline
Coal reserves in the US are expected to last for?
a. hundreds of years
b. three of four decades
c. 72 years
d. less than a decade
a. hundreds of years
A limitation for all electric automobiles is:
a. low energy density per batter
b. batteries explode more readily than gasoline
c. electric energy is not useful for autos
d. electric motors are less efficient than gasoline motors
a. low energy density per batter
Solar power is about (choose all correct)
a. 1 watt per square meter
b. 1 kW per square meter
c. 1 megawatt per square km
d. 1 gigawatt per square km
b. 1 kW per square meter
d. 1 gigawatt per square km
The efficiency of inexpensive solar cells is closet to
a. 1 %
b. 12 %
c. 65 %
d. 100 %
b. 12 %
A human running up stairs can briefly use power of approximately
a. 0.01 horsepower
b. 0.1 horsepower
c. 0.2 horsepower
d. 1 horsepower
d. 1 horsepower
A 12 oz can of soft drink contains about
a. 10 Calories
b. 50 Calories
c. 150 Calories
d. 2000 Calories
c. 150 Calories
A large nuclear power plant delivers energy of about
a. 1 megawatt
b. 1 gigawatt
c. 100 gigawatts
d. 1000 gigawatts
b. 1 gigawatt
Electricity from AAA battery costs the consumer about:
a. 1 cent per kilowatt-hour
b. 10 cents per kilowatt-hour
c. $1 per kilowatt-hour
d. $1000 per kilowatt-hour
d. $1000 per kilowatt-hour
Electricity from a wall plug costs the consumer about:
a. 1 cent per kilowatt-hour
b. 10 cents per kilowatt-hour
c. $1 per kilowatt-hour
d. $1000 per kilowatt-hour
b. 10 cents per kilowatt-hour
The energy per gallon (not per pound) of liquid hydrogen, compared to gasoline, is about
a. 3x less
b. about the same
c. 3x more
d. 12x more
a. 3x less
Most of the hydrogen we use in the US comes from
a. pockets of hydrogen gas found underground
b. hydrogen gas extracted from the atmosphere
c. hydrogen produced in nuclear reactors
d. it is manufactured from fossil fuels and /or water
d. it is manufactured from fossil fuels and /or water
You have 10 tungsten bulbs, and each uses 100 watts. You leave them all on for an hour, the energy used is
a. 10 kilowatt-hours
b. 1 kilowatt-hour
c. 10 kilowatts
d. 1000 watts
b. 1 kilowatt-hour
The kinetic energy of a bullet, per gram, is (within a factor of 2)
a. about the same as the energy released from 1 gram of tnt
b. about the same as the kinetic energy in a typical 1 gram meteor
c. about the same as the energy released by 1 gram of chocolate chip cookies
d. none of the above
d. none of the above
