Concept #1: Specific Heat

Practice: A piece of copper has a 0.0005 m^{2} area and a 5 m length. What heat is required to increase the length by 0.5 cm? The density of copper is 8960 kg/m^{3} , the specific heat is 385 J/kg K and the expansion coefficient is 1.7 x 10^{-5} K^{-1} .

A copper rod has a length of 1.5 m and a mass of 12.4 kg. In order for the rod to decrease in length to 1.2 m, how much heat needs to be removed from the rod? Note that copper has a thermal expansion coefficient of 16x10-6 K-1 and a specific heat of 386 J/kgK.

A 6.5 g alumin nail is being hammered into a piece of wood. If 50% of the kinetic energy of a 1.5 kg hammer is transferred to the nail with each strike, and all of the kinetic energy carried by the nail transformed into heat as it travels through the wood, how much does the temperature of the nail rise after being struck 5 times? Consider the hammer striking the nail at a speed of 5 m/s each time. Note that the specific heat of aluminum is 0.9 J/gK.

A 300 g block of aluminum at a temperature of 350 K is placed in intimate contact with a 600 g block of iron at 300 K. The blocks are contained within an insulated enclosure. What is the final temperature of the two blocks? Given: The specific heat capacity of aluminum is 1 J/K/g and the specific heat capacity of iron is 0.4 J/K/g.
1. 688.9
2. 450.0
3. 327.8
4. 538.9
5. 488.9
6. 400.0
7. 627.8
8. 461.1
9. 600.0
10. 355.6