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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the
longest in the world. Imagine that a steel wire with this length and a cross-sectional area of
4.00 x 10-6 m² is laid on the bridge deck with its ends attached to the towers of the bridge, on
a summer day when the temperature of the wire is 35.0°C. (a) When winter arrives, the
towers stay the same distance apart and the bridge deck keeps the same shape as its
expansion joints open. When the temperature drops to -10.0°C, what is the tension in the
wire? Take Young's modulus for steel to be 20.0 x 101⁰ N/m². (b) Permanent deformation
occurs if the stress in the steel exceeds its elastic limit of 3.00 x 108 N/m². At what
temperature would the wire reach its elastic limit? (c) Explain how your answers to (a) and (b)
would change if the Golden Gate Bridge were twice as long.
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- Week 4 #19 A copper bar of thermal conductivity 401 W/(m·K) has one end at 114°C and the other end at 24.0°C. The length of the bar is 0.110 m, and the cross-sectional area is 1.00 × 10−6 m2. If two such bars were placed in parallel (side by side) with the ends in the same temperature baths, what would the rate of heat conduction ? be? ______Warrow_forwardI have a window in my house 112 cm tall and 102 m wide. On a cold winter day, I touch the glass and it’s cold, thenmeasure its temperature as 15 °C. My thermostat is set to 21°C (ok, 70°F). How much heat am I losing due to naturalconvection to the window?.arrow_forwardIn this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is Tin = 20°C and the temperature outside is Tout = 0°C. The walls and uppermost ceiling of a typical house are supported by 2 x 6-inch wooden beams (kwood = 0.12 W/(mK)) with fiberglass insulation (kins = 0.04 W/(mK)) in between. The true depth of the beams is actually 5.625 %3D %3D %3D inches, but we will take the thickness of the walls and ceiling to be Lwall = 18 cm to allow for the interior and exterior covering. Assume that the house is a cube of length L = 9.0 m on a side. Assume that the roof has very high conductivity, so that the air in the attic is at the same temperature as the outside air. Ignore heat loss through the ground. The effective thermal conductivity of the wall (or ceiling) keff , is the area-weighted average of the thermal conductivities of the wooden beams and the fiberglass insulation that make up each of them. Allowing for the fact that the 2 x 6 beams…arrow_forward
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