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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.
The maximum flow rate needs to be 0.011 m3/s. Pumps in the U.S. are still sized by horsepower (hp). Determine the pump size needed, if the pump has an efficiency of 68%.
A 25 cm long glass fiber (E = 72.2 GPa, v = 0.25) has a fracture strength of 75 MPa. What is the minimum diameter of a fiber that can support a 10 kg load?
Taking the beginning tire pressure to be 220 kPa (gage) and the atmospheric pressure to be 100 kPa, determine the fraction of air that can be lost from a tire per year.
One is made from gold and the other from tungsten. Obtain the ratio of the cross-sectional area of the gold wire to the cross-sectional area of the tungsten wire. A of gold/A of tungsten.
Determine the following parameters. a) The pressure and temperatures at each principal state in kPa and k. b) Air mass flow rate. c) The velocity at the nozzle exit.
12 lbm of superheated water vapor at 60psia and 500deg C in a piston cylinder device is cooled at constant pressure until 70% of the mass condenses.
0.2 m3 of saturated liquid R-134a in a piston cylinder is heated at a constant pressure of 800kPa to 50 dcg C. What is the moving boundary work accomplished by this process. kJ? Is work done by or
A 10-mm-diameter Brinell hardness indenter produced an indentation 1.62 mm in diameter in a steel alloy when a load of 500 kg was used. Compute the HB of this material.
Show the process on a P-v diagram and determine (a) the final temperature, (b) the work done by the steam during the process, and (c) the total heat transferred.