Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm from each wire?
A. 57 ?T
B. 80 ?T
C. 64 ?T
D. 48 ?T
E. 40 ?T
Answer: D
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In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is
a. composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole. b. composed of a supermassive black hole surrounded by empty space. c. responsible for producing the bright continuous radiation from within the event horizon. d. responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies. e. located far from the core beyond the disk of stars of the galaxy.
A bike (shown in a top view in the diagram) travels around a curve with its brakes on, so that it is constantly slowing down. Which of the arrows shown most closely approximates the direction of the bike’s acceleration at the instant it is at the position shown? (Hint: Draw a motion diagram.)
A. A
B. B
C. C
D. D
E. E
F. F
T. T
The SI unit of frequency is ______________
Fill in the blank(s) with correct word
True or False? An object with constant nonzero acceleration can never stop and remain at rest
1.False 2.True