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Current-carrying capacity of wire, a copper wire of 0.040 in. diameter is insulated uniformly with plastic to an outer diameter of 0.12 in. and is exposed to surroundings at 100°F. The heat transfer coefficient from the outer surface of the plastic to the surroundings is 1.5 Btu/hr · ft2 · F. What is the maximum steady current, in amperes, that this wire can carry without heating any part of the plastic above its operating limit of 200°F? The thermal and electrical conductivities may be assumed constant at the values given here:
the load bearing piston in a certain hydraulic has an area 50 times as large as the input piston. if the larger piston
explain the operating principles and discuss the significant energy transfer and environmental impacts for nuclear
a cylindrical rod of stainless steel is insulated on its exterior surface except for the ends. the stead-state
whole blood is placed in a concentric cylindern viscometer. the gap width is 1 mm and the inner cylinder radius is 30
the automobile shown has 1200kg mass with center of gravity at point g and all wheel have the same 0.34m radius if the
point a of the rolling disk is moving toward the right and accelerating toward the right. the magnitude of the velocity
The vibrations of an engine mount are to be monitored by an accelerometer which can be treated as a second-order system. It is expected that the vibrations will not exceed 1 kHz. If you have an accelerometer that has a ringing frequency of 20 kHz and..
a 25d kg iron stove contains 5 kg wood and 1 kg of air. all the masses are at room temperature 20 degrees c and
a machine is found to vibrate with simple harmonic motion at a frequency of 20hz and an amplitude of acceleration of
Describe what a riser is in the context of sand casting. What are its main functions? In light of Chvorinovs rule, what should be taken into account when determining the geometry, dimension, and location of a riser in a sand casting mold?
electrical heater wires are installed in a solid wall having a thickness of 8 cm and conductivity 2.5 wmk. the right
Consider two actual power plants operating with solar energy. Energy is supplied to one plant from a solar pond at 80°C and to the other from concentrating collectors that raise the water temperature to 600°C. Which of these power plants will have a ..
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