1. The steel of the third rail of a railway system has a resistivity of 21.4...
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1. The steel of the third rail of a railway system has a resistivity of 21.4 µf-cm. If its cross-sectional area is 8.2 in', calculate the resistance per mile of rail, neglecting the effect of joints between sections. (2 point) 2. An incandescent lamp has a tungsten filament whose resistance is 96 f at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source, under which condition its temperature is 24°C. (Use a 0.0045 0/°C for tungsten) (1 point) 1. The steel of the third rail of a railway system has a resistivity of 21.4 µf-cm. If its cross-sectional area is 8.2 in', calculate the resistance per mile of rail, neglecting the effect of joints between sections. (2 point) 2. An incandescent lamp has a tungsten filament whose resistance is 96 f at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source, under which condition its temperature is 24°C. (Use a 0.0045 0/°C for tungsten) (1 point)
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Related Book For
University Physics with Modern Physics
ISBN: 978-0133977981
14th edition
Authors: Hugh D. Young, Roger A. Freedman
Posted Date:
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