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When is the energy crossing the boundaries of a closed system heat and when is it work?
an air-standard otto cycle has a compression ratio of 7.5. at the beginning of compression p1 85 kpa and t1 305 k.
The isentropic compressor efficiency is 80%. Refrigerant exits the condenser as a saturated liquid at 160 lbf/in.2 The mass flow rate of the refrigerant is 0.15 lb/s. Kinetic and potential energy changes are negligible as are changes in pressure f..
An ordinary egg can be approximated as a 5.78 cm diamater sphere. The egg is initially at a temperature of 7.9C and is dropped into boiling water at 97C. Taking the properties of the egg to be p=1020 and cp=3.32. Determine how much heat is transferre..
A large plastic casting with thermal diffusivity 6.0*10-7 m2/s is removed from its mold at a uniform temperature of 150oC. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temperature to 2..
would it be a possible to use a normal domestic refrigerator as a heat source for a small hot tub or whirlpool? if so
Estimate the fugacity for each species in the following gases at 290 K and 800 bar: (a) Pure oxygen; (b) Pure nitrogen; (c) Oxygen and nitrogen in a 30% mol O2 and 70% mol N2 mixture using the Lewis-Randall rule, and (d) Oxygen and nitrogen mixture i..
A gas-turbine power plant operating on an ideal Brayton cycle has a pressure ratio of 6. The gas temperature is 350 K at the compressor inlet and 1450 K at the turbine inlet. Utilizing the air standard assumptions, determine (a) the gas temperature ..
The problem belongs to Mechanical Engineering and the problem is about ice-hockey puck being struck with the hockey stick. The average magnitude of force exerted by stick on the puck and the direction and the angle of the puck needs to be calculat..
Assume that the controller should provide a phase margin of 60° at fc, that the feedback sensor has a gain of kFB = 0.2 and the PWM chip uses a peak ramp voltage of 1.8V. Following the steps outlined in section 4.4 of the Mohan textbook, calculate..
superpostion of a uniform flow in the x-direction of velocity u and a 2-d source of strength q produces potential flow
During some actual expansion and compression processes in piston-cylinder devices, the gases have been observed to satisfy the relationship PVn= C, where n and C are constants. Calculate the work done when a gas expands from 350 kPa and 0.03 m3 to a ..
Define fool proofing in relation to the design of jigs and fixtures as a design consideration to be taken into account
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