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The surface of the earth (kg = 1.2 W/mK) is at 300 K, what is the cooling load (W/m) that must be maintained by a cryogenic refrigerator per unit pipe length?
The valve is closed when no liquid is left in the tank and vapor starts to come out. Determine the total heat transfer for this process.
What are some of the factors neglected in the theoretical derivation of the weir flow rate equations that may in fact be of importance?
How much work must be provided, by the resistance heater inside the cylinder, to raise the piston 5 inches? The initial temp is 100 F.
The total running time from A to B is 40 seconds. Draw the a-t, v-t, and x-t curves, and determine the distance between stations A and B.
The temperature is 35.6°C. The pipe has a circular cross-section with a diameter of 0.105 m. Calculate the rate of heat transfer (kJ/s) to the R-22.
Calculate the heat dissipated when the base temperature is 600 K, the fluid temperature is 400 K, and the heat transfer coefficient is 100 W/(m2K). Take k = 180 W/(m K).
Determine the static head efficiency required of the turbine if the total pressure of its exhaust is not to be less than 1.6 bar and the exhaust velcotiy is 300 m/s.
Determine for this machine the slip factor, isentropic efficiency and the Mach number at the diffuser inlet, stating your assumptions. For air Cp=1.0 kJ/kg.K and sp. Heat ratio = 1.4.
The leakage loss is doubled compared with its operation as a pimp. If the head, flow rate and speed remain unchanged determining the power output. Density of water = 1000 kg/m3.
Knowing that G=77.2 GPa for both shafts, determine (a) the maximum shearing stress in shaft CD, (b) the angle of rotation at A.
To what temperature must it be cooled in order to have a 0.029-mm reduction in diameter? The values of Poisson's ratio and linear coefficient of expansion for nickel are 0.31 and 13.3 x 10-6 (°C
150 Btu of energy is transferred as heat to this system, and it is allowed to come to equilibrium. What will be the specific internal energy of the substance in the final equilibrium state?
Heat is then transferred to the refrigerant at a constant pressure until the last drop of liquid refrigerant in the piston-cylinder is evaporated. Determine the magnitude and direction of any heat t
For the 1st process, ΔE = 20 kJ, and for the 3rd process ΔE = -20 kJ. What is the work in the 2nd process and the net worth output of the cycle.
An energy input as heat of 42 kJ was required. Determine the difference in the specific internal energies between the initial and final states (kJ/kg).
This required an energy input as heat of 11.2 Wh. Calculate the difference in specific internal energy (J/kg) between the initial and final states.
Determine the final mass of vapor in the tank in kg, and the final pressure, in bar. Calculate the initial vapor and liquid mass.
Determine the time ratio and crank speed of the mechanism. Also, sketch the synchronized timing charts and estimate the peal velocity and acceleration of the different motion elements.
A hollow stainless steel sphere is 2.0 cm inner diameter and 5 cm outer diameter. a heater of 5W is sealed inside the sphere. Estimate the inner surface temperature.
A freezer is 1m wide and deep and 2m high and must operate at -10C when the ambient air is at 30C. What thickness of polysterene is required if the load on the refrigeration unit should not exceed 2
A secondary settling tank is to be designed for a municipal wastewater treatment facility. List one advantage and one disadvantage to circular tanks.
Some nitrogen is allowed to escape until the pressure in the tank drops to 400 kPa. If the temperature at this point is 20°C, determine the amount of nitrogen that has escaped.
Determine the total amount of heat transfer from the environment to the tank to vaporize the entire propane in the tank.
The bars are subjected to equal twisting moments. Determine the ratio of the maximum shear stresses in the two bars, assuming that they are elastic.