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Evaluate the concentration of vacancies in copper at 650C temperature. What temperature will be needed to heat treat copper such that the concentration of vacancies produced will be 1000 times more than the equilibrium concentration of vacancies at same temperature? Activation energy of copper is 20,000 cal/mol.
a facing operation is performed on an engine lathe. the diameter of the cylindrical part is 6 inches and the length is
an ideal vapor-compression heat pump cycle with refrigerant 134a as the working fluid provides heating at a rate of 15
on a cold winters day it is 30degf outside. yet the temperature of the outside surface of the mechanical engineering
the total energy contained in a closed sealed rigid can of tuna is 3000 j with a total entropy of 2.8330 jk. the ground
a coast guard cutter detects an unidentified ship at a distance of 19.6 km in the direction 17.8deg east of north. the
in a rigid chamber 30 lbm of helium is heated from 60 degrees farenhight and 30 psig to 90 degrees farenhight. if
Consider an electric motor with shaft power output of 20kW and an efficiency of 88%. Determine the rate at which the motor dissipates heat to the room it is in when the motor operates at full load. In winter, this room is normally heated by a 2-kW re..
Concrete has a density of 2500 kg/m3 and a compressive strength of 30 MPa. What is the maximum height of a column of concrete that can support its own weight? Does the radius of the column matter?
an aircraft is in level flight at 225 kmhr through air at standard conditions. the lift coefficient at this speed is
the combustion chamber of an internal combustion engine is at a temperature of 1100degc when fuel is burned in the
electrical conductivity of stainless steel at room temperature is 0.2 x 107 ?-1 m-1. a 10 foot long piece of stainless
a cylinder of radius r0 length l and thermal conductivity k is immersed in a fluid of convection coefficient h and
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