Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,
A) one wire is lifted slightly while the other wire is forced downward against the table's surface.
B) both wires are lifted slightly.
C) the wires pull toward each other.
D) the wires push away from each other.
C
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A certain utility transformer is designed to step up the emf from 1 kV to 25 kV. If the primary has 1000 turns of wire, how many turns of wire does the secondary have?
A. 25,000 B. 4000 C. 2500 D. 40 E. 25 F. Some other result (specify). T. One needs more information to answer.
A stone is thrown with an initial speed of 11.5 m/s at an angle of 50.0 above the horizontal from the top of a 30.0-m-tall building. Assume air resistance is negligible, and g = 9.8 m/s2. What is the magnitude of the vertical-velocity component of the rock as it hits the ground?
a. 7.39 m/s b. bonus question c. What is the magnitude of the horizontal displacement of the rock? d. 26.1 m
What form of interplanetary debris did mankind discover first? Why?
What will be an ideal response?
A 0.500-H inductor is connected into a 110 V rms 60.0-Hz voltage source, with an ammeter in series. What is the rms value of the current through the inductor?
A. 0.189 A (rms) B. 0.292 A (rms) C. 0.584 A (rms) D. 1.19 A (rms) E. 0.093 A (rms)