Problem 3-1.(5pts) Apiston-cylinder device contains 2 ft3of airinitially at 200 lbf/in2and 450oF. A linear spring which has a spring constant of 10 kN/m is attached to the 1-ft diameter piston and it is initially undeformed. This device is now cooled until the volume is one-half its original size. Calculate (a) the total exergy destroyed, and (b) the second law efficiency.
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Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earthβs magnetic field, which is 0.50 g. is this value cause for worry?
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Problem 3-1.(5pts) Apiston-cylinder device contains 2 ft3of airinitially at 200 lbf/in2and 450oF. A...
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