1. In the Summer when the thermostat is at 24.0 C a clock with a brass pendulum has a period of 1.00 s. In the Winter the thermostat is turned down to 20.0 C. How many days does it take for the clock to be wrong by one second? (Be careful to use enough significant digits.)

2. Instead of being driven by gravity as in Joule's experiment, the paddles are driven by a stretched spring. The water has a mass of 16.0 kg and a change in temperature of 7.45 C. If the spring is stretched 7.63 cm, what is the spring constant?

3. A 1425 kg Ford Ranger truck is going 17.9 m/s when it slams on its brakes coming to a rest. Originally at 20 C, the 1.59 kg pads heat up to 288 C. A) What is the heat capacity of the brake pads? B) What assumptions are being made to solve this problem? C) How does the heat capacity compare to normal materials the pads might be made of?

4. A 1.18 kg aluminum cylinder is rolling with a linear speed of 88.5 m/s when it goes into a container holding 2.32 kg of ethyl alcohol and comes to a rest. If the cylinder and alcohol are originally at 19.0 C, what is the final combined temperature?

Write down the key words or phrases for the following problems (5&6). Make sure you list all needed starting equations. Do not fully solve the problem. Do not solve the equation for the missing variable.

5. An ice chest at a beach party contains 12 cans of soda at 5.0C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C). Someone adds a 6.5-kg watermelon at 27C to the chest. The specific heat capacity of watermelon is nearly the same as that of water. Ignore the specific heat capacity of the chest and determine the final temperature T of the soda and watermelon.

6. An aluminum baseball bat has a length of 0.86 m at a temperature of 17C. When the temperature of the bat is raised, the bat lengthens by 0.000 16 m. Determine the final temperature of the bat.