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Physics, 12.12.2019 14:31, reinasuarez964
Explain how there can be electric charge inside matter even if the matter shows no electric forces
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Answers: 3
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Physics, 23.06.2019 07:30, kingfptduong
Which of the following characteristics is fixed, or definite, for all states of matter?
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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?
Answers: 2
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Explain how there can be electric charge inside matter even if the matter shows no electric forces...
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