1. A lead vat is 17 m long at room temperature (20°C). How much longer is it when it contains boiling water at 1 atm pressure?   ??? m

2. An aluminum wing on a passenger jet is 33 m long when its temperature is 26°C. At what temperature would the wing be 6 cm (0.06 m) shorter?   ??? Celsius

3. Air in a balloon does 36 J of work while absorbing 82 J of heat. What is its change in internal energy?   ??? J

4. A bottle containing 2 kg of water at a temperature of 16°C is placed in a refrigerator where the temperature is kept at 2°C. How much heat is transferred from the water to cool it to 2°C?    ??? J

5. A 0.03-kg lead bullet traveling 354 m/s strikes an armor plate and comes to a stop. If all of the bullet's energy is converted to heat that t alone absorbs, what is its temperature change?  ??? Celsius

6. One cubic meter of water (see Table 4.4 for the mass density of water) flowing over the Lower Falls in Yellowstone National Park drops 94 m. If all of the water's potential energy is converted to kinetic energy at the bottom of the falls and the kinetic energy goes to heat the water, what is the temperature increase of the water?   ??? Celsius

7. A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (23°C) at the ocean's surface and cooler water (6°C) 1,772 m below the surface. What is the maximum possible efficiency of the system? Enter your answer accurate to two decimal places.    ??? %