Wire A carries 4 A into a junction, wire B carries 5 A into the same junction, and another wire is connected to the junction. What is the current in this last wire?
A. 4 A away from the junction
B. 9 A away from the junction
C. 4 A into the junction
D. 9 A into the junction
E. 1 A away from the junction
B. 9 A away from the junction
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The alternating current in wide use in homes in North America is 60 cycles per second, or 60 Hz. How many times per minute does this current reverse its direction of travel?
A. 3600 times B. 60 times C. 7200 times D. 120 times E. None of these choices are correct
An empty coal-car (mass 20,000.kg) of a train coasts along at 10.m/s. An unfortunate 3000. kg elephant falls from a bridge and drops vertically into the car. Determine the speed of the car immediately after the elephant is added to its contents
What will be an ideal response?
Alex throws a 0.43-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 5.5 m/s. What is the magnitude of the change in the ball's momentum?
a. 0.09 kgm/s c. 4.3 kgm/s b. 1.0 kgm/s d. 5.2 kgm/s
At what frequency is the reactance of a 20.0-mH inductor equal to 120 ??
A) 318 Hz B) 637 Hz C) 796 Hz D) 955 Hz E) 1110 Hz