Assignment 5 Solution

Assignment 5 Solution - PHYS-232 Heat and Waves - Homework...

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Unformatted text preview: PHYS-232 Heat and Waves - Homework 5 Winter Semester 2008 Due on Thursday, January 31, 2008 1. C Al = 0 . 887 Jg 1 K 1 . The heat loss from Al is: Q A = C Al m A T = 0 . 887 5 (40- 22) = 79 . 83 J , which is the heat transferred to water in A: Q A = C H 2 O m H 2 O T H 2 O = 4 . 184 m H 2 O (22- 20). m H 2 O = 9 . 54 g . The energy gain for water in B is: Q B = 9 . 54 (4 . 184) (21 . 5- 20 . 5) = 59 . 87 J . Q B = 5 C alloy (40- 21 . 5), so C alloy = 0 . 6473 Jg 1 K 1 . 2. (a) The mercury thermometer from my medicine cabinet has a roughly cylin- drical bulb that measures 4 mm in diameter by 5 mm long. Its volume is there- fore about 60 mm 3 . Under a 1 C temperature increase, the volume of the mer- cury should increase by: V = V T = (1 . 81 10 4 K 1 )(60 mm 3 )(1 K ) = . 011 mm 3 . The expansion takes place inside a narrow tube with a length of 8 . 5 mm and unknown cross-sectional area. Assuming that the tube is cylin-and unknown cross-sectional area....
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This note was uploaded on 04/29/2008 for the course PHYS 232 taught by Professor Vinals during the Winter '08 term at McGill.

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