PHYSICS – Heat and Temperature

1. Convert the following: a. 52°c to Kelvin’s b. 140 k to Celsiusc. 700 Kelvin to Celsiusd. 2 k to Celsiuse. 30 Fahrenheit to Celsiusf. 224°f to Celsius

2. How much heat is needed to warm up 780 grams of water from 50°c to 78°c?3. A steel rod is exactly 75.00 centimeters at l00°c. Estimate its length at -25°c.4. How much heat is needed to warm a 105 kg piece of aluminum from 22°c to 120°c?5. How much heat is needed to raise the temperature of 47 grams of steam from 120°c to 300°c?

(the specific heat of steam is 2011 j/kg°c.)6. A copper rod is 70 m long at 30°c. How long is the rod at 170°c?7. If you have a sample of ice water with a mass of 55 grams at a temperature of o°c, how many

calories of heat energy are necessary to heat the water from its melting point to the boiling point?

8. How much heat is needed to raise the temperature of 2 kg of copper metal from 10°c to 30°c?

9. How much heat is needed to raise the temperature of 2 kg of water from 10°c to 30°c?10. How many joules are required to heat 250 grams of liquid water from 00 to 1000 c?11. How much heat is needed to raise the temperature of 2.0 kg of copper metal from 32°c to 78°c? 12. A steel rod is exactly 50 cm long at 0oc. Make an estimate of the length of the steel rod at 25°c.

_________ explain your answer. 13. Find the specific heat of a metal if 265,500 j of heat is needed to change the temperature of 5.0

kilograms of the metal from 2°c to 120°c. What do you think the metal might be?14. How much heat is needed to raise the temperature of 0.187 kg of water from 120oc to 300oc? 15. A 12 oz. Can of soda has a mass of about 450 grams. How many joules are released when a can

of soda is cooled from 25 degrees celsius (room temperature) to 4 degrees celsius (the temperature of a refrigerator)? Since the main component of soda is water, you may use the specific heat of water to work the problem.

16. One substance has a specific heat of 500 j/kg*k and and one has a specific heat of 1500 j/kg*k. Which of the substances is harder to heat?

17. 3 kg of gold at a temperature of 20ºC is placed into contact with 1 kg of copper at a temperature of 80ºC. The specific heat of gold is 130 J/kg · ºC and the specific heat of copper is 390 J/kg · ºC. At what temperature do the two substances reach thermal equilibrium?

18. 1 kg of cold water at 5ºC is added to a container of 5 kg of hot water at 65º C. What is the final temperature of the water when it arrives at thermal equilibrium?

19. 24 J of heat are added to a gas in a container, and then the gas does 6 J of work on the walls of the container. What is the change in internal energy for the gas?

20. How much heat is needed to raise the temperature of 30 kilograms of liquid water from 10 0C to 20 0C ?