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A piston-cylinder device contains 50 kg of water at 250 kPa and 25°C. The cross-sectional area of the piston is 0.1 m2. Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m3, the piston reaches a linear spring whose spring constant is 100 kN/m. More heat is transferred to the water until the piston rises 20 cm more. Determine
(a) The final pressure and temperature and
(b) The work done during this process. Also, show the process on a P-V diagram.
A body whose surface area is 0.5 m2, emissivity is 0.8, and temperature is 150C is placed in a large evacuation chamber whose walls are at 25C. What is the rate at which radiation is emitted by the surface, in W? What is the net rate at which radiati..
10 [kg] of refrigerant 134a contained in a piston-cylinder assembly undergoes a polytropic process for which Pvn = Constant. The initial and final states of the refrigerant are: P1= 240 [kPa], T1= -5 [oC], and P2= 960 [kPa], T2= 70 [oC], respectively..
The cantilevered bar in the figure has a circular cross section and is subject to bending and torsion. The normal stress due to bending in x=28 kpsi and the shear stress due to torsion is xz=15.3 kpsi. The change in diameter introduces a stress conce..
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A man goes to a traditional market to buy a steak for dinner. He finds a 12-oz steak (1 lbm = 16 oz) for $3.15. He then goes to the adjacent international market and finds a 320-g steak of identical quality for $2.80. Which steak is the better buy..
calculate the specific volume for ammonia gas at 450 k and 4000 kpa using a ideal gas equation b compressibility chart
an escalator brings four people of total 300 kg 25 m up in a building. explain what happens with respect to energy
1 a presser relief valve has a pressure setting of 1500 psi. compute the horsepower loss across the valve if it returns
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an automatic automotive transmission casing has a shape of a rectangular box with side dimensions 40 cm x 30 cm x 50
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