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Physics, 11.11.2019 13:31, sarahbennett11p4yxlb
When a woman stands with two feet on a scale, the scale reads 280 n. when she lifts one foot, the scale reads a. less than 280 n. b. more than 280 n. c. 280 n.
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Physics, 23.06.2019 08:00, edjiejwi
Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?
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When a woman stands with two feet on a scale, the scale reads 280 n. when she lifts one foot, the sc...
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