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Find out the open circuit voltage (V) of the cell? Assume a p-n junction ideality factor 1.5 and neglect any series and parallel resistance.
A simple ideal Rankine cycle which uses water as the working fluid operates it condenser at 40 degrees Celsius and its boiler at 300 degrees Celsius. Calculate the work produced by the turbine.
Knowing that when θ = 40o the velocity of wheel B is 1.5 ft/s upward, determine (a) the angular velocity of the door, (b) the velocity of end D of the door.
When the outer temperature is raised to 200 degrees Celsius, the heat flux increases to 40,000 W/m^2. Is the thermal conductivity independent of temperature? Explain.
The thermal conductivity of the stone is 2.15 W/mK. Neglect Radiation Effects. Also, Determine the inside and outside surface temperature of the stone wall.
The temperature in the cylinder reaches 250°C, at which point the valve is closed. Determine (a) the mass of steam that has entered and (b) the amount of heat transfer.
Using this data, and assuming that the material behaves according to eq 1, predict the steady state creep rate that should be observed for a stress of 60 GPa at a temperature of 1150 oC.
Determine (a) the number of cycles executed per minute and (b) the energy rejected as the heat to the low temperature resevoir each cycle.
Heating continues until no liquid remains in the tank. Neglecting kinetic and potential energy effects, determine the mass of the vapor that escapes in kg
Rake angle=15degree, cutting force=500N and thrust force=200N. Calculate the percantage of the total energy that is dissipated in the shear plane during cutting?
The pressure is nearly equal to 1 bar at both the inlet and exist, and the temperature is nearly constant at 20 C throughout the system. Determine the power required by the pump, in KW.
Using the ideal gas model with constant cv, determine (a) the final equilibrium pressure, in kPa (b) the heat transfer for the process, in kJ.
The bar had these original dimensions: length = 10.000 in , diameter = 0.750 in. Compute the modulus of elasticity of the metal.
The bar had these original dimensions: length = 10.000 in, diameter = 0.750 in. Compute the modulus of elasticity of the metal. What kind of metal was it probably made from?
It is placed between rigid supports with a distance between them of 10.505 in. If the supports do not move, describe what would happen to the bar when it's temperature is raised to 400 degrees F.
Using air properties for the exhaust gases, determine (a) the air temperature at the compressor exit and (b) the isentropic efficiency of the compressor.
Compute the value of the exponent in the relationship pv =pv= constant describing the irreversible compression process? plot the reversible and irreversible process on p-v and t-s diagrams.
Determine the amount of extra heat that must be supplied to the gas in the cylinder which is maintained at constant pressure to achieve this result. Assume the molar mass of the gas is 25.
Determine the reduction in the exit temperature of the compressed air and the compressor power saved. Assume the water vaporizes completely before leaving the compressor.
If you were to heat a 30 at% Ni, composition, a 50 at% Ni composition, and an 80 at% Ni composition from 600oC, at what temperature would the first liquid form for each composition?
Calculate the frequency ratio, the damping ratio(factor), the lag angle, the amplitude of the vibration, and the maximum force transmitted to the foundation.
Validate your FEHT model by comparing predictions with the analytical solution for a fin with thermal conductivities of k = 50 W/m*K and 500 W/m*K.
The member width and thickness arc large compared with the crack size. What is the safety factor against brittle fracture?
How much energy must be added as heat to bring the water to the saturated vapor state? Under this constant pressure condition, the work done by the expanding water on the environment is given by.
The average surface temperature of the mixing chamber is 130oF. Find the entropy generation (Btu/s·°R) for the mixing chamber.