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Natural gas with a lower heating value (LHV) of 45,000 kJ/kg is burned on a gas stove with a combustion efficiency of 94.7% to produce 4.49 kW of heat.
It's about how to measure an increase in wind velocity through a restriction.It starts with an area that is 17' wide by 14' high by 20' deep and it's a right triangle with a 16 degree slope.
Water vapor at 3.0 MPa and 300C (State 1) is cooled to 200C(State 2) then is isothermically compressed to 2.5MPa (State 3). Locate all three states on a T-v diagram.
Sap from a maple tree contains 5% sugar and 95% wateer on a dry basis. Your evaporator will boil away 1.25 kg of water per minute. How many hours must you operate the evaporator in order to produce
What is the probability that the part will be less than 1.240 inches? What is the probability that the part will be at least 1.258 inches?
A house is maintained at 75°F in the winter by a heat pump. The house is losing heat at a rate of 60,000 Btu/h through the walls and roof. The heat pump operates on an ideal vaporcompression&nbs
What percentage of the bearings will last for 38,000,000 cycles? If the manufacturer is willing to accept a 5% failure rate, what warranty time should he put on the bearings?
An ideal gas undergoes a process between two specified temperatures, first at constant pressure and then at constant volume. For which case will the ideal gas experience a larger entropy change? Exp
What percentage of the engines will fail by 100,000 miles? At what mileage should you set the warranty for your vehicles if you are willing to repair 1% at no cost to the consumer?
Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 10 Mpa, 450 C, and 80 m/s, and the exit conditions are 10 kPa, 92 percent quality, and 50 m/s.
A natural gas has the following composition, all values being in volumetric percent. Find: composition in mole percent and density at standard conditions, as pound per cubic foot.
A computer cooled by a fan contains eight PCBs, each dissipating 10W power. The height of the PCBs is 12 cm and the length is 18 cm. The cooling air is supplied by a 25 W fan mounted at the inlet.
An 800 ft ship has a displacement of 37600 tons, and the area defined by the waterline is 38,000 ft2. (a) Will the ship take more or less draft when steaming from salt water to fresh water?
An air-conditioner with refrigerant 134a as the working fluid is used to keep a room at 26 C by rejecting the waste heat to outdoor air at 34 C.
Pinion speed is 120 rev/min, gears are manufactured to a number 8 quality and installed with less than perfect rigidity, though contact is across the full face. Find the AGMA bending and contact str
The magnitude of the absolute velocity at the pump exit is 60 ft/s. The fluid enters the pump rotor radially. Calculate the shaft work required per unit mass flowing through the pump.
Calculate the acceleration field (find expression for acceleration components ax and ay as funtions of x and y). what is the acceleration at the point (x,y) = (1, -3)?
A big fireplace can be approximated as 1.5 m3 of volume. It's made of firebrick with properties: ? = 2,600 kg/m3 and c = 950 kJ/kg-C. It is subjected to 50 MW average of radiation and convection hea
A piston cylinder device contains 1 kg water at 20oC with a volume of 0.01 m3 by mistake someone locks the piston preventing it from moving while we heat the water to saturated vapor.
Repeat the treatment in e) but this time hold only for 50s at 400°C, then rapidly heat to 600°C, hold for 5s and then quench in water. What phases will you have now?
Measurements show that the final volume is double the initial and the final pressure is 25% of the initial. Assuming that air behaves as an ideal gas, determine the final temperature in K and the h
A 80 kg resting person with a constant core temperature near 37 C transfers heat at the resting rate to his/her surroundings, which is at a temperature of 22 C.
Determine the change in the rate at which the following quantities enter and exit the tube: (a) the combined thermal and flow work, (b) the mechanical energy, and (c) the total energy of the water.
A steel pipe of 12-in. outer diameter is fabricated from 1/4in. thick plate by welding along a helix which forms an angle of 22.5 degrees with a plane perpendicular to the axis of the pipe.
What is the minimum required length of the rod so that one end of the rod can be twisted 30 degrees with respect to the other end without exceeding the allowable stress?