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The second consists of the componants with reliablitiy (r1) in series with a combination of two identical componants in parallel that each have a reliablity of (r3=0.90) calculate the overall reliab
A horizontal aluminum rod, 1 cm in diameter and 10 cm long, has both ends maintained at 363 K. Find the temperature at the midpoint of the rod.
A sample standard deviation of 1.25 ohms. Construct 90% and 95% two-sided t-intervals for the average resistance of all the resistors produced in the run.
Find probabilty that any one bottle is filled with more than 251ml. Calculate the value of C for which 95% of the bottles contain a volume in ml between (251-c) and (251+c)
After a period of time, the pressure in the tank rises to 1.5 MPa. Determine the final volume (m3) of the water in the tank. Assume variable specific heats (use the property tables for water)
The tunnel is located in Boulder, Colorado ( altitude = 1650 m, density = 1.044 kg/m^3), and the flow is assumed isentropic. What is the density at the test section?
What is the max speed that the air can attain? If the max airspeed of 100 m/s is desired, what is the temperature to which the air must be heated before entering the duct?
When air is released adiabatically from a tire, the temperature of the air at the nozzle exit is 37 degrees celsius below that inside the tire. What is the exit speed of the air?
One jet is at 400 K and 100 m/s, and the other is at 200 K and 300 m/s. In the absence of heat addition or work, what is the temperature of air in the reservoir?
The steam expands adiabatically until its final pressure reaches 2 bar. Determine the maximum theoretical work that can be developed by the steam in such expansion, in kJ.
If a turbine with the same inlet conditions operates isentropically and has an outlet containing 2 wt % moisture, what is the outlet pressure and temp?
The products of combustion leave the engine at 750 k and the heat transfer from the engine is 250 kw. Determine the fuel consumption in kg per hour if complete combustion is achieved.
Air at 20 c, 40% RH is mixed adiabatically with air at 40 c , 40% RH in the ratio of 1 kg of the former to 2 kg of latter on a dry basis.
What size UNF bolt made from SAE grade 5 steel is needed to carry a static tensile load of 3000lb with a safety factor of 4 based on proof strength?
What power is required to drive each screw when the gate is being raised at the rate of 3ft/min? What is the corresponding rotating speed of the screws?
If we need to maintain the wire at a temperature of 250oC, what should be the rate of electrical heating (in Watts) that should be applied to the wire so that its temperature can be maintained?
Develop a supplemental heat schedule as a function of the environmental air temperature that minimizes the total supplemental and heat pump energy required to service the building.
Determine the surface temperature Tb in K? (For this one I got Tb = 406 K)For the motor as the system, determine the rate of entropy production, in W/K.
If it is subsequently heated at constant volume until its pressure is 4bar, what is its quality after this heating? Sketch the processes described above on a p-v diagram and a T-s diagram.
What is the minimum temperature of the cold reservoir, where the heat addition to the system occurs? What would be the minimum temperature if the coefficients of performance is 6?
We have calculated 32 nodes throughout the whole wall and have found the temperature of the 32nd node. What equation must be used to translate that temperature into the inside temperature of the box
The uniform slender bar ABC weighs 6 lb and is intially at rest with end A bearing against the stop in the horizontal guide. Calculate the loss of energy E due to the friction in the guides and roller
1000 ft^3/min of air at 50 degrees Fahrenheit dry-bulb and 95% relative humidity are mixed with 1500 ft^3/min of air at 76 degrees Fahrenheit and 45% relative humidity. What is the humidity ratio o
The exit pressure is 14.7 psia. The ratio of specific heats for the air is 1.4 throughout the nozzle. What is the throat area in ft^2?
A container with volume 2 m^3 filled with three different gases, 20 kg oxygen at -23 C , 50 kg nitrogen gases at 27 C, and 30 kg of argon at 127 C are mixed. Determine the intial pressure of each ga