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R134a is condensed at a constant temperature of 30°C as it flows through the condenser of a refrigerator by rejecting heat at a rate of 6 kW. Calculate the rate of entropy change of R134a as it flows through the condenser.
the aluminum shade for the small high intensity lamp has a uniform thickness of 1mm. Knowing that the density of aluminum is 2800 kg/m^3, determine the mass of the shade.
a 2mm diameter metor of specific gravity 2.9 has a speed of 6 kms at an altitude of 50000m where the density of air is
the 12-mg truck drives onto the 350-mg barge from the dock at 20 kmh and brakes to a stop on the deck. the barge is
a 200-m-high 4-m-diameter stack emits 1000 kgs of 100 degree c gases into 5 degree c air. the prevailing wind velocity
saturated liquid water is heated in a steady-flow steam boiler at a constant pressure of 800 psia. no shaft work is
a compressor is designed to run at 4000 rpm when ambient conditions are 101 kpa and 20c. on the day when the
an inventor claims to have devised a refrigeration cycle that at steady state requires a net power of .8 hp to remove
the work and the heat per degree change of temperature for a system executing a non-flow process are given by dwdt 80
a bicyclist of mass 70kg supplies 300 watts of power while riding into a 3ms headwind. the frontal area of the
2 m3 of air in a rigid and insulated container that is fitted with a paddle wheel assembly. the air starts at 300 k and
water in a piston-cylinder initially starts at t 400of and p 200 psia. the piston is heated until it final volume is
a 0.5 m3 tank contains air at 300 k and 0.75 mpa. a valve is suddenly opened and air rushes out until the tank pressure
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