As a rotating gas cloud contracts, it spins
A) at a constant rate.
B) faster due to an increase in angular momentum.
C) slower due to conservation of angular momentum.
D) slower due to a decrease in angular momentum.
E) faster due to conservation of angular momentum.
E
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Two long parallel wires are placed side-by-side on a horizontal table and carry current in the same direction. The current in one wire is 20 A, and the current in the other wire is 5 A
If the magnetic force on the 20-A wire has magnitude F, what is the magnitude of the magnetic force on the 5-A wire? No external magnetic fields are present. A) 4F B) 2F C) F D) F/2 E) F/4
Why does Mars have more extreme seasons than Earth?
A) because it is farther from the Sun B) because it has a larger axis tilt C) because it has a more elliptical orbit D) because it has more carbon dioxide in its atmosphere
A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A small tack with charge Q is lowered on a silk thread through the hole into the interior of the shell. What is the charge on the outer surface of the shell now?
1.Q 2.Q/2 3.0 4.-Q/2 5.-Q
Spherical Mirrors: Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?
A. 10 cm B. -40 cm C. -50 cm D. 40 cm E. 50 cm