A horizontal wire carries a current straight toward you. From your point of view, the magnetic field at a point directly below the wire points
A) directly away from you.
B) to the left.
C) to the right.
D) directly toward you.
E) vertically upward.
C
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A 15.0-kg child is sitting on a playground teeter-totter, 1.50 m from the pivot. What force, applied 0.300 m on the other side of the pivot, is needed to make the child lift off the ground?
A) 75.0 N B) 736 N C) 22.5 N D) 44.1 N E) 66.2 N
The types of current carried by the headlights of an automobile, and by a plug-in toaster in your kitchen, are
A) both DC. B) both AC. C) AC and DC, respectively. D) DC and AC, respectively. E) None of the above.
A 2500-kg truck moving at 10.00 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 6.00 m/s. What was the mass of the struck car?
a. 1730 kg c. 1200 kg b. 1670 kg d. 1070 kg
The path of a light ray through a refracting surface is reversible
Indicate whether the statement is true or false