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What is the concentration in kilograms of silicon per cubic meter of alloy? Assume that the densities for iron and silicon are, respectively, 7.87 and 2.33 g/cm3.
Two kg of saturated liquid water at 1 bar is compressed to 25 bar and 100°C in a water pump. Determine the change in internal energy (kJ) and enthalpy (kJ) of water. (a) Using compressed liquid
Determine a) max flowrate of water, b) the pressure difference across the pump. Assume the elevation difference between the pump inlet and the outlet and the effect of kinn factors to be negligible.
If the satellite is made of material with an average thermal conductivity of 5W/m K and the midpoint temperature is 0 C determine the heat generation rate and the surface temperature of the satellit
For the same number of air-conditioning units and the same desired temperature, how many people should be invited to the room for a party featuring a few hours of dancing?
The emissivity of the surface is 0.8, determine the total rate of heat transfer from the ball. At what temperature must the ball be maintained so that the heat transfer by radiation is 55% of the to
Determine at 10 m above the lake the change in each component (i.e. kinetic energy, etc) of the mechanical energy with respect to their values at the outlet of the pump.
Determine a) the overall turbine-generator efficiency, b) the mechanical efficiency of the turbine, and c) the shaft power supplied by the turbine to the generator.
Convert the equation from part a) so that the mass of oil (in kg) is given as a function of the measured pressure (in mmHg). Using these equations, determine the height of oil and mass of oil when t
The midpoint temperatureis 0 degrees celcius, determine the heat generation rate and the surface temperature of this satellite. Assume the temperature in space as 0 Kelvin.
The velocity of the air stream decreases from 230 m/s to 30 m/s as it passes through the diffuser. Find the following: (A) exit temperature of the air (B) exit area of the diffuser.
The inlet area of the nozzle is 90cm2. Determine (a) the mass flow rate through the nozzle, (b) the exit temperature of the air, and (c) the exit areaof the nozzle.
At what temperature will the steam start to condense when the container is cooled? What is the pressure at this condition? How much heat was removed?
What is the minimum allowable volumetric flow rate of the air? The density and specific heat of the air may be approximated as p = 1.161 kg/m^3 and c(p) = 1007 J/kg K, respectively.
Lighting is provided by 18 fluorescent bulbs, 40 W each, and the ballasts consume an additional 10 percent. Determine the rate of internal heat generation in the classroom.
Determine the turbine efficiency and the combined turbine-generator efficiency of the plant. You may neglect frictional (and other) losses in the pipes.
If the temperature measurement can be made within 1 degree C, how accurate must the pressure measurement be? Assume an ideal gas (hint: P = rho RT)
In order to determine the power dissipated across a resistor the current flow and resistance values are measured separately.
The maximum compression of the springs is to be .2m., determine the required stiffness of the inner spring kb, if the outer spring has a stiffness ka=400N/m.
The inner and outer surfaces of a 6-m X 7-m brick wall of thickness 41 cm and thermal conductivity .69 W/m*C are maintained at temperatures of 29 C and 2 C, respectively.
Find the distance a traveled by the piston. If W is the work done by the gas chamber 1, what are the final temperatures T1 and T2 in the two chambers? What is the final pressure P? Find W, the work
The water in the beaker began to boil when pressure in the bell jar reached x kPa. What is the numerical value of x? Explain your answer conceptually.
If the flow rate of water is measured to be .03 m^3/s, determine mechanical power that is converted to thermal energy during this process due to frictional effects.
Assuming the ideal gas model of air with Cp=1.02 kJ/kg * K, determine if either or both of these pressure values can be correct.
Electric power is to be generated by installing a hydraulic turbine-generator at a site 130m below the free surface of a large water reservoir that can supply water at a rate of 1,550 kg/s steadily.