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1 kg of steam at 100 bar and 375°C expands reversibly in a perfectly thermally insulated cylinder behind a piston until pressure is 38 bar and the steam is then saturated.Calculate the work done by the steam.
1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressure to a temperature of 300°C.Calculate the heat supplied and change of entropy and show the process on a T-s diagram, indicating the area which represents the heat flow.
the cooling water flow rate to the condensers of a big coal-fired power plant is 8460 kgs. the water enters the
determine the work done in lifting a 250-lb refrigerator 4 ft vertically into a van. alternatively the refrigerator
Determine the applied torque required to accelerate a rotor of mass 100 kg and radius of gyration 500 mm from a speed of 50-300 rpm in a time of 12 s. Neglect bearing friction.
The ball is kicked from point A with the initial velocity vA=10m/s. Determine the range R, and the speed when the ball strikes the ground
At a certain location, wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power generation potential of a wind turbine with 60 m diameter blades at that location. Take the air density to be 1.25 kg/m.
you decide to do a demonstration on a rooftop that requires water. there isnt a handy faucet so you put a barrel of
A mixture of H2O 67.5% liquid and 32.5% vapor is in a closed, rigid container at 4 bar. The water is heated to 400 oC, determine the work and heat transfer, in kJ
air at 1 bar and 20 degrees c is compressed isentropically to 20 bar pressure. for both a and b assume that air is an
One and one-half pounds of water within a piston-cylinder assembly execute a Carnot power cycle. During isothermal expansion, the water is heated at 5008F from saturated liquid to saturated vapor. The vapor then expands adiabatically to a temperat..
a plane wall of thickness l4cm has a thermal conductivity of k20 wmk. a chemical reaction takes place inside the wall
Consider the gas carburizing of a gear of 1020 steel at 927oC. Calculate the carbon content at 0.5mm beneath the surface of the gear at 5hr carburizing time. Assume the carbon content at the surface is 0.90% and that the steel has a nominal carbon co..
The shaft of a rolling machine is driven by means of a motor placed horizontally. The flywheel which also acts as a pulley is of 1.5 m diameter and has belt tension 5.4 kn and 1.8 kn on tight and slack side respectively.
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