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Refrigerator operates at steady a coefficient of performance of 5.0 within a kitchen at 238C. The refrigerator rejects 4.8 kW by heat transfer to its surroundings from metal coils located on its exterior.
Determine
(a) the power input, in kW.
(b) the lowest theoretical temperature inside the refrigerator, in K.
a mass of 4.0 kg of r-134a at p1140 kpa and t1 20 cis contained in a gas tight frictionless piston cylinder device. the
the masses of a b and c are 5 kg 15 kg and 100 kg respectively. the coefficient of friction between all contacting
refrigerant r-134a enters a 1 cm constant diameter tube at 400 kpa and 30 degree c. the refrigerant leaves the tube at
a baseball player catching a ball can soften the impact by pulling his hand back. assuming that a 5-oz ball reaches his
the 230000 lb space shuttle orbiter touches down at about 220 mihr. at 200 mihr its drag parachute deploys. at 35 mihr
a rigid tank is divided into two equal parts by a partition. one part of the tank contains 2.5 kg of compressed liquid
a 1 m3 rocket-propellant chamber is tilled with combustion gases at 3000 k and 7 mpa at the instant combustion ceases.
a child throws a ball from point a with an initial velocity v 20 ms at an angle of 25 degrees with the horizontal.
apple juice at 20c is siphoned from a large tank using a constant-diameter hose. the end of the siphon is 1m below the
a 3000-lb car accelerates under constant power from 60 mileh to 90 mileh on a 0.25 mile straight level test track.
a dam in western north carolina takes a 30 m3 s flow of water from the nantahala river and diverts it to a turbine
Consider 6.0 kg of austenite containing 0.45 wt% C, cooled to below 727 degrees Celcius (1341 degrees Farenheit).
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