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Unformatted text preview: Version 001 – HW26 – gavrin – (25111) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Heating Brake Drums 001 10.0 points When a driver brakes an automobile, the fric- tion between brake drums and brake shoes converts the car’s kinetic energy to heat. If a 1070 kg automobile traveling at 24 m / s comes to a halt, how much does the tem- perature rise in each of the four 7 . 2 kg iron brake drums? The specific heat of iron is 448 J / kg · ◦ C. Correct answer: 23 . 8839 ◦ C. Evaporating Nitrogen 002 10.0 points The specific heat of a metal (similar to cop- per) is 0 . 092 cal / g · ◦ C. The latent heat of vaporization of a liquid (similar to liquid ni- trogen) is 48 cal / g. A 1 kg block of the metal at 28 ◦ C is dropped into a large vessel of the liquid at 80 K, which is the boiling point of the liquid....
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This note was uploaded on 04/11/2011 for the course PHYS 25100 taught by Professor Dr.andygavrin during the Spring '10 term at IUPUI.
- Spring '10