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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 arm of a car windshield wiper is 12.75 inches long and is attached at the middle of 15.00 inch blade assume that
5 kg of water at 1 atm in a cylinder was heated until it is half boiled.1 what is the atm inside the cylinder?2 the
a 1020 cd steel shaft is to transmit 20 hp while rotating at 1750 rpm. determine the minimum diameter for the shaft to
a copper vertical plate that is 0. 305 m tall and 1. 5 m wide separates two large air spaces. the air space at the left
the melting temperatures for various materials are listed in the inside cover of callister. some representative values
A stainless steel rod with a circular cross section has a length of 100 mm and a diameter of 2.0 mm. It is deformed elastically in compression by a force of 500 N applied parallel to its length. The material has a Young’s modulus of 200 GPa, and a sh..
1 one mole of a monatomic ideal gas is subjected to the following sequence of stepsa. starting at 300 k and 10 atm the
Calculate the polar moment of inertia of an assembly and using the result to predict the periodic time of a trifilar suspension of the assembly.
one kmol of ideal gas cp30 jmolk is contained in a piston cylinder initially at 25c and 10bar. the mass of the piston
superheated steam enters a nozzleat 0.13 mpaand 600 k and exits at 0.1 mpa. heat interactions and frictional effects
determine the tower height required to remove 90 of co2 from air by water in a dilute solution in a packed tower with a
a large stationary diesel engine produces 15mw with a thermal efficiency of .4. the exhaust gas which we assume is are
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