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A new refrigerator-freezer combination unit is being designed with a dual-evaporator system to be used in a recreational vehicle. The freezer compartment is to be at -14.0°C and the refrigerator compartment is to be at 8.0°C. The outlet of the condenser is at 20.0°C. The cooling capacities of both the refrigerator and the freezer compartments are to be 200. kJ/h each. The system will use refrigerant R-134a with a compressor isentropic efficiency of 70.0%.
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.
Two blocks are connected with a rope that passes of a set of pulleys. One block weighs 412 Newton’s, and the other weighs 908 Newton’s. The rope and the pulleys have no mass or friction. (a) What is the acceleration of the lighter block?
For what initial speed will a golf ball that leaves the ground at an angle of 60 degrees pass through a hole 20 meters above the ground in a building that is 60 meters away?
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Discuss the merits of a dual-spin design with body-fixed solar arrays vs. a 3-axis stabilized spacecraft bus with deployed arrays.
Suppose you have a near-point distance of 16 cm. The angular resolution of the eye is determined by diffraction, What is the smallest object your bare eye can resolve
Two atomic particles approach each other in a head-on collision. Each particle has a mass of 1.77 x 10-25 kg. The speed of each particle is 1.94 x 108 m/s when measured by an observer standing in the laboratory.
a man with a mass of 80.0 kg is out fishing with his daughter who has a mass of 35.0 kg. they are initially sitting at
Evaluate what is the final temperature of 350 gram of Pepsi to which 50 gram of ice has been added? The Pepsi came from the refrigerator (T=10oC) while the ice is at 0oC
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