A soda straw is stuck into water at an angle of 36° to the vertical. Looking straight down, what does the angle of the submerged portion of the straw to the vertical appear to be?
44°
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Lenz's Law: A bar magnet is oriented above a copper ring, as shown in the figure. If the magnet is kept fixed while the ring is dropped, what is the direction of the current induced in the ring, as viewed from below the ring?
A. There is no current in the ring. B. counterclockwise C. clockwise
What happens to the light that is emitted from the accretion disk around a black hole?
A) It is redshifted. B) It is blueshifted. C) It is pulled in multiple directions by tides. D) It cannot be seen from anywhere in our solar system. E) It is absorbed by the black hole.
In a nuclear reactor, "chain reaction" refers primarily to
A. the process of heating water to create steam to generate electric power. B. the process by which the fission of one nucleus causes other nuclei to undergo fission. C. an out-of-control explosion. D. the enrichment of uranium to make fuel for the reactor.
A car is initially moving at 30 m/s east and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval?
a. north of west c. west b. northwest d. north of east