1112assignment1

# 1112assignment1 - College Physics II Assignment 1 Due date...

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College Physics II Assignment 1 Due date: 29 February 2012 1. A composite bar of length L = L 1 + L 2 is made from a bar of material 1 with coefficient of linear expansion α 1 and length L 1 attached to a bar of material 2 with coefficient of linear expansion 2 and length L 2 . (a) What is the coefficient of linear expansion for this composite bar? (b) Using steel and brass, what are their lengths whose total length is 52.4cm and whose coefficient of linear expansion is 13.0 x 10 -6 / o C? [15 marks] [ Coeffcient of linear expansion of steel and brass are 12 x 10 -6 / o C and 18.5 x 10 -6 / o C respectively.] 2. A house has well-insulated walls 17.5 cm thick (assume conductivity of air) and area 410m 2 a roof of wood 6.5 cm thick and area 280 m 2 and uncovered windows 0.65 cm thick and total area 33 m 2 . (a) Assuming that heat is lost only by conduction, calculate the rate at which heat must be supplied to this house to maintain its inside temperature at 23°C if the outside temperature is -10°C

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1112assignment1 - College Physics II Assignment 1 Due date...

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