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What is the rate at which the entropy of nitrogen changes? What is the rate at which the entropy of the surroundings changes? Does this system satisfy the second law?
What is the maximum allowable height of a pillar of concrete if the maximum compressive stress is sigma allow = 50 MPa, the density is rho = 2400 Kg/m3
It has been proposed that a refrigerator which rejects heat at 20 C will be used to lower the temperature of the coldest reservoir to 0 C. Will the overall efficiency of the system be improved by ad
The boiler is sized to provide a steam flow of 57.18 kg/s. Determine A) the power produced by the turbine and B) power consumed by the pump.
If the specific heat ratio of the working fluid is 1.3, what is the highest thermal efficiency this gas turbine can have?
An ideal diesel cycle is compressed from 2 to 0.13 l (isentropic) and then it expands during the constant pressure heat addition process to 0.3l. Under cold air standard conditions determine thermal
Determine the A) net work produced per unit mass of air each time this cycle is executed and B) the cycle's thermal efficiency.
Determine the position of the particle when t=6 s and the total distance it travels through the 6-s time interval. Plot the path to determine the total distance traveled.
The inlet to the turbofan has an area of 53.3 ft^2. The inlet air density is 0.075 lbm/ft^3 (a) calculate the exit velocity in f t/s. (b) Calculate the inlet velocity to the fan assuming constant de
Ti+4 ions (radius= 0.064 nm, atomic wt = 47.90) at the center of the cube. Using this information calculate the density of CaTiO3 in grams per cm3.
Air undergoes a polytropic expansion from 2500 R to 1500R. The final pressure of the air is 20 psia and n for the process is 1.32. Determine the work output per pound mass of air.
How much energy, in kj/kg must be added to obtain 600 degree Celsius at the exit if the pressure remains constant?
How much heat in kj, must be added to a rigid volume, containing 2 kg of water/ Vapor mixture with x =0.5 to increase the temperature from 200 degree Celsius to 500 degree Celsius?
A 3 kg particle is moving in the vertical y-direction with a velocity of 4 m/s when acted upon by a resultant force Fy=(5+2t^2) N where t is the time of application in seconds.
Determine the angular velocity of the bar and the velocity at point A point A is on top with a 30 deg angle the slope is 105 deg from the vertical wall.
Calculate the force exerted by the ready-mix concrete on each form. Determine the line of application of the force
Estimate the sedimentation rates (terminal velocities) of human red blood cells (RBC) in dispersed in normal saline and in a 10,000 g field.
Air is expanded in an adiabatic turbine from an inlet state of 1800 kPa and 300oC to an outlet pressure of 200 kPa. what is the outlet temperature of the air?
A beam has a solid square cross section of 100 mm and is simply supported by two supports 3m apart. Calculate the dead load that can be safely supported when applied to the middle of the beam.
What is the Ymax, total distance traveled and the time at ymax and time at the total distance traveled(x distance)?
Determine the heat transfer coefficient on the surface of the sphere, i.e. h. Is the assumption of a lumped mass justified?
What is the rate at which energy is emitted by the surface via radiation? What is the net rate at which radiation is exchanged between the surface and the chamber walls?
The air temperature is 20 C and the heat transfer coefficient in the air is only 50 W/(m 2 - m). What is the surface temperature of the heater in this case?
Determine the heat flux from the room into the refrigerator if the convection coefficients are h = 5 W/(m 2 -K) on both the interior and external surfaces of the sheet metal panels.
The air is supplied to the burner at 600 K. The gaseous products of complete combustion leave the burner at 1100K. Determine the required heat transfer in kJ/kmole of fuel.