Numerade

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Baskar P

Numerade educator

The mass of CO2 is 0.066 kg in a system (with molar mass 44 kg/kmol), occupying a volume of 0.024 m3 at 1.1 bar is compressed reversibly until the pressure is 6.19 bar. If the molar (universal) gas constant as 8.3145 kJ/kmol K, calculate the the work done on the C02 (in joules) when the process is isothermal. To 3 d.p.

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ANSWERED

Baskar P

Numerade educator

At the exhaust of a turboject engine the nozzle is operating steadily and heat loss is assumed negligible. If the specific enthalpy of fluid and velocity of fluid at the inlet are 3232 kJ/kg and 269 km/hr respectively. At the exit the specific enthalpy of fluid is 2526 J/kg. Calculate the exit area (in mm2)of the nozzle when the specific volume at the nozzle exit is 0.67 m3/kg at the inlet area of 0.20 m2 and the specific volume at the inlet is 0.34 m3/kg. You do not need to include the unit for this question. Calculate answer to 3 d.p.

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INSTANT ANSWER

A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was designed to maintain a set temperature of 6 ˚C. The bodies consist of two 10-mm-thick layers of Aluminium (k = 225 W/mK) separated by a 30 mm polyurethane insulation (k=0.028 W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces are 11.6 W/m2K and 14.5 W/m2K respectively, calculate: the resistance(R) for the inner fluid thermal layer in K/W to 4 decimal places.

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Thabo S.