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However, the pump requires 60 W of parasitic power to operate continuously. Is installation of the pump justified? Explain. At what value of parasitic power does the addition of the pump become unj
At these conditions, the latent heat of vaporization of ethanol is 779 kJ/kg. The final pressure of the ethanol is 1 atm. What is the final temperature of the ethanol, and why?
Consider a PEFC operating with the following specifications: = 80% and the pressure is 2 atm at the anode, and = 20% and the pressure is 3 atm at the cathode. Assume that the gibbs free energy of fo
Wind is blowing on a 55-gallon drum. Estimate the wind speed needed to tip the drum over. Work in SI units. The mass of the drum is 48 lbm, the diameter is 22.5 in, and the height is 34.5 in.
Estimate the drag of a thin square plate (3m by 4m) when it is towed through water (10 OC). Assume a towing speed of about 5m/s.
A concrete sewer pipe 3 ft in dia is laid so it has a drop in elevation of 1 ft per 1000 ft of lenght. if swage (assume the properties are the same as those of water) flows at a depth of 1.5 ft in t
Piston cylinder contains 1 kg of water. initially the water is at 200 kpa, 20 degrees Celsius. water is now heated until the piston strikes stops at which point the volume of the water is .113 m^3.
Locate the centroid x and y of the cross sectional area and then determine the orientation of the principle axes, which have their origin at the centroid C of the area. Also find the principle mome
Draw and dimension the bar diagram for a 3 3/8 in. shaft, with a Class 3 fit. Draw and dimension a typical hole and shaft for this fit. Use unilateral tolerances and the basic hole system for maximu
Determine the product of inertia of the cross sectional area with respect to the x and y axes that have their origin located at the centroid C
Consider a 15-cell stack hydrogen fuel cell operating steadily in series with 200 cm2 active area per electrode, with a current density of 0.9 A/cm2. The fuel cell nominal voltage is 0.5 V per plate
Water at 60F flows through 5,000 ft of pipe with a 50 ft headloss. The pipe is riveted steel with smooth walls. The rivets cause flow resistance; and therefore e=0.003ft. compute the pipe diameter
Determine Specific volume of the water vapor at intial state using the compressibility chart. Specific volume of the water vapor using at initial state using ideal gas equation.
A jet is coming out of a dive and a sensor in the pilots seat measures a force 800lbs for a pilot whose weight is 180lbs, if the jet intrustments indicates that the plane is traveling at 850 mph, d
The R-134a is then heated to a final temperature of 30 degrees centigrade. Determine whether or not the piston reaches the stops.
The outdoor air temperature is 6 degrees C while a building maintains the inside temperature at 22 degrees C and loses heat through the walls and roof at a rate of 15 kw.
Calculate the time rate of change HB of angular momentum about point B where the particle passes the bottom of the guide at C
The cylinder reaches 300 C, while a heat loss of 90kJ occurs simultaneously through the cylinder walls. Determine the amount of mass entering the cylinder from the line, in kilograms.
Determine the change in momentum in each vehicle. Determine the average force acting on vehicle 1 during the 0.15 seconds.
A water faucet is to be added by running a line from a water main at 300 kPa. The diameter (cm) of the cast iron pipe is to be determined. A gate valve is placed near the attachment to the water mai
A 3-phase 25 kVA, 208 V, 60 Hz, alternator (generator) is operating under balanced conditions and supplies a current of 20 A per phase at 0.8 lagging power factor to a load at rated voltage.
The acceleration of a particle is defined by the relation A=25-3x^2 where A is expressed in m/s^2 and X in meters. The particle starts with no initial velocity at x=0. Determine position where the v
Determine the minuimum coeffeicent of static friction between A and B required for A not to slide with respect to B if θ = 23. Friction between the sled and the incline is negligible.
A high school project involves building a model ultralight airplane. Some of the stu- dents propose making an airfoil from a sheet of plastic 1.5 m long by 2 m wide at an angle of attack of 12o.
Measurements of the power out of the turbine indicate that it is 4 MW. Determine the heat loss from the turbine (Btu/s).