Lenz's Law: An outer metal ring surrounds an inner metal ring, as shown in the figure. The current in the outer ring is counterclockwise and decreasing. What is the direction of the induced current in the inner ring?
A. clockwise
B. counterclockwise
C. There is no induced current in the inner ring.
Answer: B
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__________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus
a. Irregular b. S0 c. E7 d. Sa e. E0
Acceleration: If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.
A. True B. False
A difference between the special and general theories of relativity is that
A. special relativity is valid only in stationary reference frames. B. special relativity deals with accelerated systems. C. general relativity deals with accelerated systems. D. general relativity only deals with swiftly moving objects.
Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A) The small sphere arrives first. B) Both reach the bottom at the same time. C) The large sphere arrives first.