1. In the Activities Center you rolled a ball on a plastic track which looked similar to:

Will the ball in the position shown go over the hill at X?

Yes, because its energy at Y is equal to the energy it will have at X.
Yes, because its kinetic energy at the bottom will be greater than its gravitational potential energy at X.
No, because the ball's energy decreases due to friction.
No, because the ball's energy at Y is less than its energy at X.
None of the above.

2. Kevin (mass = 35 kg) is walking at 3 m/s. What is his kinetic energy?

81 J
105 J
157 J
315 J
None of the above.

3. In the Activities Center you dropped cylinders onto nails. You were asked to determine the kinetic energy of the cylinders just before they hit the nails. Could you do this without measuring the speed of the cylinders?

Yes, by using conservation of energy.
Yes, by measuring the motion of the nail.
No, because KE =(mass) (speed)2.
No, because energy is not conserved for short times.
None of the above.

4. Remember the diver. Think about her standing on the diving board which is three meters above the pool. Relative to the pool what type(s) of energy does she have?

Kinetic Energy
Gravitational Potential Energy
Elastic Potential Energy.
Electrical Energy.
More than one of the above.

5. Some potatoes have a specific heat capacity of 3.5 kJ/(kg oC). How much energy must be added to a 0.25 kg potato to raise its temperature from 20oC to 30oC?

8.75 kJ.
87.5 kJ.
175 kJ.
262.5 kJ.
None of the above.

6. In the Activities Center you mixed 0.3 kg of water at 20oC with 0.6 kg of water at 10oC. What would be the temperature of the final mixture?

10oC
12oC
15oC
20oC
None of the above.

7. Suppose that you did the same experiment as in question 6 except that you used 0.3 kg of water at 20oC and 0.6 kg of olive oil at 10oC. Would you get the same answer as in question 6?

Yes, because the amounts and temperatures are the same.
Yes, because both substances are liquids.
No, because olive oil melts at a lower temperature than water.
No, because the substances have different specific heat capacities.
None of the above.

8. Suppose you placed 0.2 kg of ice at 0oC in one electric pot and 0.2 kg of water at 0oC in another. The pots are identical and turned on at the same time. The ice melts. Which of the substances will be warmer after five minutes?

The water which was originally ice.
The water which was originally water.
The temperature will be identical.
Insufficient information is given to answer the question.
None of the above.

9. Recall the simulated asphalt road in the Activities Center. Suppose that the colors were reversed so that it had a white stripe on a black background. What convection pattern would you expect? (The views below are looking through the side glass.)

(a)
(b)
(c)
(d)
None of the above.

10. As discussed in class the bottom of the space shuttle is a black material. Why is it black?

To absorb solar energy.
To insulate the shuttle from the cold of space.
To maintain a uniform temperature on the shuttle.
To allow quick conduction of thermal energy.
None of the above.

11. In class we used a rectangular glass tube to look at convection. The gas burner was placed at X in the diagram below. Suppose we place the burner at Y. How would the water move?

In the same direction as it did in class.
In the opposite direction as it did in class.
It would not move.
Simultaneously in both directions.
None of the above.

12. In the Activities Center you looked at temperature change of objects inside and outside of greenhouses. In class we discussed why different groups obtained different results. What factors were involved in this experiment?

Limiting convection.
Reflections from the plastic.
Large molecules in the upper atmosphere.
More than one of the above.
None of the above.

13. Two ski jackets have exactly the same amount of goose down in them. In one jacket the down layer is 6 centimeters thick; in the other the down is squeezed to be 3 centimeters thick. Which jacket will keep you warmer?

The thicker jacket because it has more air trapped in the down.
The thicker jacket because it has more space to absorb energy.
The thinner jacket because it has less air trapped in the down.
The thinner jacket because it has a smaller surface area.
None of the above.

14. Kim bakes three pumpkin pies and uses three different pie pans. The pans are made of glass, aluminum, and iron. Which pie will cook most rapidly?

Glass (Thermal resistivity = 16.0 m2s oC/Jm)
Iron (Thermal resistivity = .012 m2s oC/Jm)
Aluminum (Thermal resistivity = .0042 m2s oC/Jm)
They will cool at equal rates.
None of the above.

15. Suzanne is sitting near a campfire similar to the one in last week's video. Her face feels warm. How does the thermal energy move from the fire to her face?

Convection
Conduction
Radiation/Absorption
More than one of the above.
None of the above.

16. Randy has two cups with identical amounts of coffee. Each cup is identical but the coffee in one has a temperature of 80oC while the coffee in the other is at 60oC. Through which cup will the movement of thermal energy be greater?

The cup with 80oC coffee.
The cup with 60oC coffee.
The energy movement will be the same for both cups.
Insufficient information is given to answer the question
None of the above.