1. What would be the temperature when 50 g of 40 0C water is mixed with 30 g of
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1. What would be the temperature when 50 g of 40 0C water is mixed with 30 g of 60 0C water?2. You heat 2 liters of water for a certain time and its temperature rises by 30C. If you apply the same amount of heat to 1 liter of water for the same time, how much will its temperature rise?
3. A glass mug and a steel mug are sitting on the kitchen counter and they have the same amount of water in them. The water in which mug will cool quicker and why?
4. Explain briefly why a lake freezes from the top first. 2 points
5. How does the average kinetic energies per molecule compare in a mixture of hydrogen and nitrogen gases at the same temperature?
6. Briefly explain why in the winter you want carpet in your bedroom rather than tile when you get out of bed barefooted.
7. How does the density of air in a deep mine compare with the air density at the surface?
8. A rock suspended by a scale weighs 5 N out of water and 3 N when submerged in water. What is the buoyant force on the rock?
9. Wind speeding up as it blows over the top of a hill
a. decreases atmospheric pressure there
b. increases atmospheric pressure there
c. does not affect the atmospheric pressure there
10. A stone is submerged in water and displaces a volume of 20 cubic centimeters. What is the volume of the stone?
11. If an immersed object displaces 20 N of fluid. What is the buoyant force on the object?
12. A 2 kg book is lying on a table. The area of the book is 80 cm2. What is the pressure exerted on the table by the book?
13. A 12 kg piece of metal displaces 2 L of water. What is the density of the metal in kg/L?
14. When a liquid changes phase to a gas it
a. absorbs energy
b. emits energy
c. becomes more conducting
d. none of the above
15. What happens to the gas pressure in a sealed can when it is heated? 2 points
a. increase
b. decreases
c. stays the same
Explain why!
16. Raising a car in a service station requires work. Raising it twice as high requires:
A. The same amount of work
B. Twice the work
C. Twice the power
D. All of the above
17. A machine can’t multiply
a. forces
b. distances
c. energy
d. all of these
18. Dave jumps from a tall pole into a pool. His potential energy at the top is 10, 000 J. What is his potential energy when his kinetic energy is 8000 J?
19. Pumice floats in water. The density of pumice is
A. Less than the density of water
B. Equal to the density of water
C. More than the density of water
20. The density of a rock does not change when it is submerged in water. Does your density change? Defend your answer.
21. Water has a high specific heat capacity which means
A. It requires a lot of energy to increase its temperature
B. It gives off a lot of energy in cooling
C. It absorbs a lot of energy for a small increase in temperature
D. All of the above
22. Thermal convection is linked to
A. Radiant energy
B. Fluids
C. Insulators
D. All of the above
23. The origin of much of the thermal energy in the earth’s interior is
A. High pressure
B. Trapped radiant energy
C. Low conductivity of rock
D. Radioactive decay
BONUS QUESTION!
Is it easier to float in salt or fresh water? Explain your answer using density!
Explanation / Answer
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