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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?
If A has a constant angular acceleration of 30 rad/s^2, determine the tangential and normal components of acceleration of a point located at the rim of B when t = 3s, starting from rest.
A motor gives gear A an angular acceleration of 4(t^3) rad/s^2, where t is in seconds. If gear A is initially turning at 20 rad/s, determine the angular velocity of gear B when t = 2s.
Determine the ratio of the mass flow rates of the hot to cold water. Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a pressure of 20 psia.
For simplicity, you can assume the rope and pulley are ideal (no mass, no friction, etc.). Call your mass plus the mass of the seat M. How hard do you have to pull on the rope so that you accelerate
Knowing that Uk=.6 between the block and the horizantal surface and e=.7 between the block and the sphere, determine after impact; (a) the maximum height h reached by the sphere, (b) the distance x
Saturated liquid refrigerant R-134a at 40 deg.C is throttled into an evaporator coil where the temperature is -30 deg.C. What is the quality of the refrigerant after the expansion?
Rrefrigeration system removes 100 kJ/min from a cooling station held at a temperature of -5 C and rejects 125 kJ/min into the surroundings at 30 C. (a) Calculate the coefficient of performance of t