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The electric resistance heater are running continuously but the air temperature in the room remains constant. The rate of heat loss from the room that day is?
Derive the eulerian form of the continuity equation by equating the rate of increase of the mass inside an infitesimal rectangular parallepiped to the rate at which mass flows into the paralellepip
Gasoline has a lower heating value of 44000 kJ/kg and a density of 0.75 g/cm3. Determine the thermal efficiency of your car engine.
Metal Y has a higher coordination number than Metal X due to its crystal structure. Based on this information, which of the two metals would you expect to show larger ultimate tensile strength? why?
There are no significant kinetic and potential energy effects. (a) Show the process on a sketch of the P-v diagram (b) Evaluate the work and heat transfer (in kJ).
A mass weighing pounds, attached to the end of a spring, stretches it inches. Initially, the mass is released from rest from a point inches below the equilibrium position.
From environmental considerations, the temperate of the river downstream can be no more than 72 F. Determine the maximum theoretical power that can be developed, in MW, subject to this constraint.
Determine: a) the rate at which is discharged to the cooling water, in BTU/h b) the minimum theoretical rate at which energy could be discharged to the cooling water, in Btu/h.
The cycle rejects energy by heat transfer to cooling water at a lower temperature of 300 K. If there are 100 cycles per minute, what is the minimum theoretical value for T in K.
A well sealed room contains 60 kg of air at 200 kPa and 25 deg C. Now solar energy enters the room at an average rate of 0.8 kJ/s while a 120 W fan is turned on to circulate the air in the room.
The deformation in the column caused by a temperature increase of 50°F. d. If the temperature changes as noted in question C, will the average axial stress of question b change? Why?
Determine the amount of heat, Qcomb, needed to raise the temperature of the system from T3 = 700 K to T4 = 1300 K. Express the amount of heat in terms of kW as well as kJ/kg of air flowing through t
In a model AC generator, a 512-turn rect- angular coil, 9 cm by 15 cm, rotates at 60 rev/min in a uniform magnetic field of 0.58 T.
Write a MATLAB program to compute how much money will accumulate in 5 years in the account and in any CD's you buy. Run the program for two diffrent savings rates: 4 percent and 5percent. Using for
Assuming an ideal adiabatic expansion of the gas through the nozzle, find the exhaust temperature T6, if the conditions at state 5 are: T5 = 1000 K and p5 = 6 atm.
Heat is transferred to the H2O until the volume doubles. A) Deterimine the final temperature B) Calculate the sign and magnitude of the work done and the heat transferred in this process.
Calculate the change in the specific enthalpy of the flow, and the temperature and density at State 2. What was the necessary area change of the diffuser?
Assuming the Argon finally comes to equilibrium filling the entire vessel and that the two chambers have equal volume, determine the change in entropy of the Argon.
Determine which rectangular channel, b/a = 1.0, 1.43, or 2.0, will provide the highest heat transfer rate. Is this heat transfer rate greater than, equal to, or less than the heat transfer rate asso
Air moves along a constant pressure path at 100 kPa from 20 to 100oC. What is the entropy change during this process assuming air is an ideal gas with constant specific heats?
An ideal gas in a piston-cylinder assembly is compressed in an internally reversible and isothermal process. Is the entropy change of the gas (greater than, equal to, less than) zero? Explain.
If the desired output of the engine is 15 kW determine the heat transfer from the high temperature reservoir and the heat transfer to the low-temperature reservoir.
Consider a cylinder containing air at 1200 kPa and 350 C and then, the air is expanded to 140 kPa with a reversible adiabatic process. Calculate the specific work (kJ/Kg) done by the gas. Assume ca
A 5-kg collar A is at rest on top of, but not attached to, a spring with stiffness K1= 400 n/m when a constant 150-N force is applied to the cable.
if the ambient temp is 25C and the ambient pressure is 1 bar, what is the maximum possible work that could be obtained per kilogram of steam in any continuos process?