A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible
Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the potential across the capacitor is 30 V, what is the rate of change of the current?
A) 1000 A/s
B) 1500 A/s
C) 2000 A/s
D) 2500 A/s
E) 3000 A/s
B
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An intercooler of an air compressor is to use a finned flat tube heat exchanger as shown in Figure 9-29. Compressed air at 100 psia, 130ºF passes through the tubes at 100 ft/s and air at 14.7 psia, 70ºF, and 100 ft/s passes around the tubes. Determine the convective heat transfer coefficient, the friction factor for the cooling air outside the tubes, and the overall convective heat transfer coefficient for the intercooler. Assume the inside dimensions of the flattened tubes are 0.105 in by 0.865 in.
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