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Two kilograms of water undergo a process from an initial state where the pressure is 2.5 MPa and the temperature is 400°C to a final state of 2.5 MPa, 100° C. Determine the entropy change of the water, in kJ/K, assuming the process is
(a) irreversible.
(b) internally reversible.
during an experiment conducted in a room at 25ordmc a person estimates that a refrigerator drawing 2 kw of power has
1 .The mechanical properties of cobalt may be improved by incorporating fine particles of tungsten carbide (WC). Given that the mod- uli of elasticity of these materials are, respectively, 200 GPa (30 x 106 psi) and 700 GPa 2. (a) What is the dis..
Calculate pressure on side bars, thrust in the connecting rod and tangential force on the crank pin and (iv) turning moment on the crank shaft.
A copper wire, 5 mm in diameter and 15 ft long, has a voltage drop of 0.6 volts. Find the maximum temperature in the wire if the ambient air temperature is 25°C and the heat transfer coefficient h is 5.7 Btu/hr · ft2 · F.
Water enters the pump of a steam power plant as saturated liquit at 20kpa at a rate of 45kg/s and exits at 6mpa. Neglecting KE and PE changes and assuming the process is reversible, determine the power input of the pump
a 5 ft3 tank containing steam at 14.7 psia 1 quality is fitted with a relief valve. determine the heat transfer to the
Air is compressed by 10.50-kW compressor form P1 to P2. The air temperature is maintained constant at 26ºC during this process as a result of heat transfer to the surrounding medium at 10ºC. Determine the rate of entropy change of the air.
a system consisting of 3 lb of water vapor in a piston-cylinder assembly initially at 350 degrees f and a volume of
The lever BCD is hinged at C and attached to a control rod at B. If P = 100 lb, determine the tension in rod AB and the reaction at C, using both the graphical method and the analytical method base on force decomposition.
Estimate the mass of the gas in the tank in kg assuming the gas behaves as an ideal gas. If the gas warms up to 35 deg C as it sits in the sun all day, what would the pressure rise to?
cells need to be close to a blood vessel to obtain sufficient oxygen. model the tissue surrounding a blood vessel as a
A heat engine operates between a source at 530C and a sink at 8C. If heat is supplied to the heat engine at a steady rate of 1,450 kJ/min, determine the maximum power output of this heat engine.
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