Faraday's law of induction states that the emf induced in a rectangular loop of wire is proportional to
A. the magnetic flux.
B. the time variation of the magnetic flux.
C. current divided by the time.
D. the magnetic flux density times the area of the loop.
B. the time variation of the magnetic flux.
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Which of the following statements about quantum tunneling is not true?
A) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists. B) It is used in modern electronics and, in fact, our modern-day computers would not work without it. C) It plays a crucial role in nuclear fusion in the Sun. D) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.
You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16 cm
If you could use any two of these lenses to build a telescope, what is the lens separation for the telescope to provide the maximum magnification for comfortable viewing of a planet? A) 10.0 cm B) 12.0 cm C) 18.0 cm D) 24.0 cm
Clouds inhibit the outflow of terrestrial radiation. This acts to
A) insulate Earth's surface temperature. B) warm Earth's surface temperature at night. C) cool Earth's surface temperature during the day. D) insulate Earth's surface temperature, keeping it warmer at night and cooler in the day.
Newton's Second Law in 1 Dimension: A 590-kg rocket is at rest on the launch pad. What upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3 s?
Fill in the blank(s) with the appropriate word(s).