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A refrigeration cycle having a coefficient of performance of 3.0 maintains a computer laboratory of 18oC on a day when the outside temperature is 30oC. The thermal load at steady state consists of energy entering through the walls and windows at a rate of 30,000 kJ/h and from the occupants, computers, and lighting at a rate of 6,000 kJ/h. Determine the power required by this air conditioner and compare this with the minimum theoretical power required for any refrigeration cycle operating under these conditions, each in kW.
the support at a is a ball-and-socket joint that is incapable of supporting any moments. the tension in the cable
a man of mass m1 walks along a plank of length l with a constant acceleration a relative to the plank. The mass of the plank is m2 and the coefficient of friction between the plank and the ground is mu. Find the distance the plank moves if the man..
for the two-dimensional flow with velocity components u y - 2 and v 2x3i compute the equations of
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