An aluminum wing on a passenger jet is 26 m long when its temperature is 28C. At what temperature would the wing be 2 cm (0.02 m) shorter?

Unit: C

Air in a balloon does 58 J of work while absorbing 86 J of heat. What is its change in internal energy?

Unit: J

A bottle containing 6 kg of water at a temperature of 16C is placed in a refrigerator where the temperature is kept at 5C. How much heat is transferred from the water to cool it to 5C?

Unit: J

A 0.07-kg lead bullet traveling 387 m/s strikes an armor plate and comes to a stop. If all of the bullet's energy is converted to heat that it alone absorbs, what is its temperature change? C

One cubic meter of water (see Table 4.4 for the mass density of water) flowing over the Osprey Falls in Yellowstone National Park drops 46 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?

C

What is the maximum efficiency that a heat engine could have when operating between the normal boiling and freezing temperatures of water?

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A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (17C) at the ocean's surface and cooler water (6C) 1,257 m below the surface. What is the maximum possible efficiency of the system? Enter your answer accurate to two decimal places.

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