5. If energy is conserved, why do we speak about “running out of energy’’ or having an “energy shortage” or “energy crisis?

A. Energy is not really conserved

B. Energy is difficult to find.

C. When we use energy, we convert it to a more disordered, diffuse form that cannot be easily reused.

D. Energy does not have a precise definition in physics, but in our everyday language it does have a precise definition.

E. There are not sufficient sources of work.

6. If you have an engine that has a limited supply of fuel, say with 104 J of energy, approximately how high could this engine lift a person?

A. 1m

B. 10m

C. 100m

D. 1cm

E.  10cm

7. The concept that describes why energy cannot be reused and why some energy is of higher or lower quality than other types of energy is known as

A. Entropy

B. Momentum

C. Velocity

D. Acceleration

E. Work

8. Approximately how much energy do you consume each day in food, measured in Joules?

A. 2000 J

B. 104 J

C. 102 J

D. 106 J

E.  10 J

9. Give examples of transforming gravitational potential energy into at least two (2) other form of energy.

10. Consider a 1000kg (2200 lb) automobile driving down the highway at a speed of 70mph (that’s about 30 m/s in SI units). Approximately how much energy does this car have in units of dietary calories?

A. 450,000 Calories

B. 100 Calories

C. 106 Calories

D. 100,000 Calories

E.  1 Calorie

11. If I use an amount of electrical energy equal to 24 kWh in one day, then on average what is my rate of power consumption?

A. 24W

B. 24kW

C. 24 kWh

D. 1 kW

E.  1 W

12. Charles-Augustin Coulomb discovered …

A. the force law for static (not moving) charges.

B. the law of conservation of charge.

C. the law of conservation of energy.

D. the torsion balance.

E. that charges come in two types.

13. Protons reside in the nuclei of atoms and …

A. are also called alpha particles.

B. are also called neutrons.

C. have a positive electrical charge.

D. have a neutral electrical charge.

E. have a negative electrical charge.

14. While energy is conserved, the quality of energy …

A. always increases.

B. remains the same.

C. always decreases.

D. can either increase or decrease.

15. One gram of fat is equivalent to about 0.035 oz. That means that it would take 453g of fat to make 1 lb. of fat. Approximately how much energy is in 1g of fat?

A. 1 Cal

B. 1 cal

C. 9 Cal

D. 9 cal

E. 90 J

16. Approximately how much energy can be stored in 1 lb. of fat?

A. 4000 J

B. 453 Cal

C. 4000 cal

D. 4000 Cal

E. 27 Cal

17. If you were to double the distance between two charged particles, how would the magnitude of the force between them change?

A. The force would double.

B. The force would quadruple.

C. The force would remain the same because the charges are still the same.

D.  The force would be halved.

E.  The force would be 1/4 of what it was originally.

18. Current flowing in a conductor tends to heat the conductor because …

A. conductors need to be heated in order to actually transmit electricity.

B. electrons moving through the conductors collide with other charged particles in the conductor, thus giving energy to the conducting material and heating it.

C. electrons are always hotter than the medium in which they travel.

D. protons travel at nearly the speed of light.

E. there are no materials that conduct electricity at room temperature.