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The piston/cylinder contains 0.1 kg R-410a at 600 kPa, 60oC. It is now cooled, so the volume is reduced to half of the initial volume. What is the heat transfer in the process?
In 2001, the United States produced 51% of its electricity in the amount of 1.878 * 10^12 kWh from coal fired power plants. Taking the average thermal efficiency to be 34%, determine the amount of t
A manometer connected to the tap shows a head of 0.14 in. of mercury above atmospheric. Determine the approximate speed of the air leaving the nozzle if it is at 40°F and 14.7 psia.
A rigid tank whose volume is 0.5 m3, initially containing ammonia at 20oC, 1.5 bar, is connected by a valve to a large supply line carrying ammonia at 12 bar, 60oC.
Steam enters a diffuser at 20 psia and 240oF with a velocity of 900 ft/s and exits as saturated vapor at 240oF and 100 ft/s. The exit area of the diffuser is 1 ft2.
Hot combustion gases enter a gas turbine at .8Mpa and 1500 K at a rate of 2.1 kg/s and exit at .1 Mpa and 800 K. If heat lost from the turbine to the surroundings at a rate of 150 kj/s find the powe
What is the maximum allowable hole diameter? Assume Y = 1.4. Note, given more than one choice of material data, choose conservatively.
Water flows at 50oC inside a 2.5-cm-inside-diameter tube such that hi= 3500 W/m2 oC. The tube has a wall thickness of 0.8 mm with a thermal conductivity of 16 W/m2 oC. The outside of the tube loses
The temperature rises and CO2 vaporizes. If the pressure in the tank is not to exceed 111 bar, what should be the maximum allowable temperature in the tank?
An adiabatic heat exchanger is used to heat cold water at 8 deg C entering at a rate of 3kg/s by hot air at 150 deg C entering at the rate of 3 kg/s.
The wood beam has an allowable shear stress of 7 MPa. Determine the maximum shear force V that can be applied to the cross section.
10 Kg of water in a piston cylinder exists as a saturated mixture at 120 kpa with quality 40%. sketch a P-V diagram of the process. Label the states and draw saturated liquid/vapor curve.
Determine the internal energy change of air in a rigid container as its temperature is increased by transferring 50Btu/lbm of heat.
If a paint retailer produces a blend containing 17.0 wt% pigment, for how much ($/kg) should it be sold to yield a 10% profit?
What is the force exerted by the atmosphere downward on the end cap? What is the net force exerted on each bolt holding the end cap in place?
2-kg of saturated liquid R-134a with an initial temperature of -10 C is contained in a well-insulated, weighted post cylinder device. This device contains an electrical resistor to which 10 volts ar
Determine the rate of diffusion of Cu in Al at 300K, using D = Do exp (-ED/RT), where Do = 0.15 cm2/sec, and ED = 125 kJ/mole. Note that 1 kJ = 1000 J.
What is the entropy change?Determine the change in entropy based on a value for specific heat at the average temperature?
What is the normal stress on a plane whose normal makes an angle of 60degree with x axis, 45degree with y axis, and is in the positive octant?
Some nitrogen is allowed to escape until the pressure in the tank drops to 400 kPa and the temperature is 20°C. Determine the amount of nitrogen, in kg, that has escaped.
A two ton (4000 Ibf) weight is suspended on a 30 foot long, half inch diameter steel cable. What was the original length of the cable before the weight was applied? The modulus of steel is 29,000 k
A closed system contains 2-kg of air undergoes an isothermal process from 600 kPa and 200oC to 80 kPa. Determine the initial volume of this system, the work done, and the heat transfer during this p
If the allowable shear stress is 8,000 psi and both shafts are solid, calculate the required diameter of the belt drum shaft.
A rigid tank contains an ideal gas at 1227 C and 200 k Pa. The gas is cooled until the gauge reads 50 k Pa. If the atmospheric pressure is 100 k Pa, determine the final temp of the gas?
If the company demands a 15% return on investments such as this, what is the net present worth (NPW) of the proposal? Should it be funded?