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A new commercial refrigerator-freezer combination unit is being designed with a dual-evaporator system. The freezer compartment is to be at -24.0°C and the refrigerator compartment is to be at 8.00°C. The outlet of the condenser is at 26.0°C.
The cooling capacities of both the refrigerating and the freezer compartments are to be 800. kJ/h each. The system uses refrigerant R-134a with a compressor isentropic efficiency of 89.0%. Determine
a. The coefficient of performance for this design.
b. The mass flow rate of refrigerant required.
c. The quality at the outlet of the refrigeration evaporator.
The fundamental frequency of a pipe that is open at both ends is 592 Hz. How long is this pipe?
How many neutrinos per second should there be per square meter at the Earth from this process? This huge number is indicative of how rarely a neutrino interacts, since large detectors observe very few per day.
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A 58-kg skier is going down a slope oriented 35° above the horizontal. The area of each ski in contact with the snow is 0.13 m2? Determine the pressure that each ski exerts on the snow.
a skateboarder starting from rest rolls down a 13.0 m ramp. when she arrives at the bottom of the ramp her speed is
The negative muon is a subatomic particle with the same charge as the electron but a mass that is about 207 times greater: m(u)~ 207 m (electron). Determine the radius and energy of the first Bohr orbit in a muonic hydrogen atom
Point charges of 3uC and -2uC are placed .22m apart where can a third charge be placed so that the net force on it is zero? Give answer in terms of meters from the -2uC charge. This particular question the answer is .340 I already missed this ques..
A 0.302-m-thick sheet of ice covers a lake. The air temperature at the ice surface is -16.0 °C. In 5.90 minutes, the ice thickens by a small amount. Calculate the number of millimeters by which the ice thickens
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