Do Now:1. During a certain time interval, a 20-N object

free-falls 10 meters. The object gains how many Joules of kinetic energy during this interval?

Do Now (3/6/12):

1.Make a list of concepts you need to know for your test tomorrow

Ms. Timson’s

Review to Conquer Physics

Rules of the Game• There will be tribes, as divided by the teacher• For each problem which appears on the slide, the tribe will be able to work

together to vote on one answer given only the time which will be written on the slide.

• Tribes cast their answer using their voting cards only in the time allowed.• Each team with a correct answer is allowed to cast one vote to remove

another tribe from the island. The teacher will have each tribe cast their vote simultaneously by writing the color of the tribe they are voting for on their white board. The teacher will then remove tribes from the island.

• The teacher will track which tribes are in and which tribes are out of the game with signs on the board.

• If a tribe is voted out, they can reenter the game by answering the next question correctly to reenter. They will NOT receive a vote for that question but must wait until the next question.

• Winning tribes will be those still on the island at the end of the game.• ***The teacher will be the final judge of any conflicts or confusions – and

remember, be respectful and be honest!

1. Oxygen boils at -183 C. What is this temperature in F?

A.-215 FB. -297 FC. -329 FD. -361F

1 minute

2.Absolute zero may be regarded as that at which _________.

A.water freezesB.all gases become liquidsC.all substances are solidD.molecular motion in a gas would be

minimum possible10 seconds

3. Which of the following statements best explains how evaporation cools a liquid?

A.The slowest molecules tend to escape.B.The pressure on the liquid decreases.C.The fastest molecules tend to escape.D.The pressure on the liquid increases.

25 seconds

4. Fifty kilojoules of heat is added to a 20-kg block of ice at 0 C. How much ice will melt?

A.0.093 kgB. 0.15 kgC. 0.63 kg D. 2.5 kg

50 seconds

5. 2 kg of water at 40ºC is to be turned into ice at -17 ºC. In order to do this, which process should take place first?

A.raise the temperature of water to 100 ºC.B.lower the temperature of water to -17 ºC.C. lower the temperature of water to 0 ºC.D. freeze the water right away.

30 seconds

6. Which of the following statements about the temperature is TRUE while water is being turned to steam?

A.The temperature stays at the freezing point.B.The temperature decreases.C. The temperature increases.D.The temperature remains at the boiling point.

30 seconds

7. Thirty kilojoules of heat is removed from 1.4 kg of ice initially at -10C. What is its new temperature?

A.-10.2CB. -20.4CC. -30CD. -98C

1 minute

8. How much heat is released to turn 2.5 kg steam at 100 ºC to water at 100 ºC?

A.-6.70 x 106 JB. -6.16 x 106 JC. -7.12 x 106 JD. -5.65 x 106 J

1 minute

9. The temperature of an object is raised by 50C. This is equivalent to an increase in its absolute temperature (Kelvin scale) of

A.28 KB. 50 KC. 90 KD. 323 K

1 minute

11. Two objects in thermal equilibrium have the same _______ .

A)amount of heat B) thermal energy C) specific heat D) temperature

45 seconds

12. A physicist plans to change 100 grams (0.100 kg) of ice at –10.0 oC into 100 g of water at 50 oC.

The heat required to raise the ice to its melting point is:

A)206 J B) 418 J C) 2060 J D) 4180 J E) 33400 J

20 seconds

13. A physicist plans to change 100 grams (0.100 kg) of ice at –10.0 oC into 100 g of water at 50 oC. The heat required to melt the ice from 0˚C is:

A)0 J B) 206 J C) 334 J D) 2060 J E) 33400 J AB) 226000 J

1 minute

14. A physicist plans to change 100 grams (0.100 kg) of ice at –10.0 oC into 100 g of water at 50 oC. The heat required to raise the temperature of the melted ice at 0˚C to 50oC is ____ .

• A) 20.9 J B) 209 J C) 2090 J D) 20900 J

1 minute

*bonus! A 300-g sample of water at 80ºC is mixed with 800-g sample of methanol at 10ºC. Assume no heat loss to the surroundings. What is the final temperature of the mixture?

1 minute 30 seconds

20. If a 2 kg object undergoes free fall for 50 m, it will lose about ____ J of potential energy.

A)0 B)70 C)100 D)200 E) 1000

45 seconds

A 2.0 kg stone is dropped from the top of a cliff that rises 50.0 meters above ground.

21. What is the potential energy of the stone at the top of the cliff before it is dropped? (Use the ground as the base level.)

A) 40 J B) 100 J C) 400 J D) 1000 J E) 10,000 J

45 seconds

A 2.0 kg stone is dropped from the top of a cliff that rises 50.0 meters above ground.

22. As it falls, what is the kinetic energy of the stone at a height of 30 m from the ground?

A)60 J B) 200 J C) 400 J D) 600 J E) 1000 J AB) 4000 J

45 seconds

A 2.0 kg stone is dropped from the top of a cliff that rises 50.0 meters above ground.

23. As the stone falls it reaches a speed of 20 m/s. What is its kinetic energy at this point?

A)20 J B) 40 J C) 200 J D) 400 J E) 600 J

45 seconds

A 2.0 kg stone is dropped from the top of a cliff that rises 50.0 meters above ground.

24. What is the height of the stone when it has a speed of 20 m/s?

A)3 m B)4 m C) 10 m D)30 m E)E) 40 m

45 seconds

How much heat is required to turn 2 kg of water at 25 ºC to steam at 125 ºC?

45 seconds

Congratulations!Good luck tomorrow!

I know you can conquer your test