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If resistance in AC circuit is 100 OHMS and impedance 120 OHMS, what is circuit's power factor (rounded)? How many different groups of 4 problems can be chosen from the 10 problems? 4. Does the Latent Period, Duration of Contraction, or Duration of Relaxation change with stimulus strength? Why are the ice shelves and Greenland melting so fast lately? If you are traveling at 77mph what is your angular axle speed in RPM, revolutions/minute? Tire diameter of 28 inches?