A flat square coil of wire with 15 turns and an area of 0.40 m2 is placed with the plane of its area parallel to a magnetic field of 0.75 T
The coil is flipped so its plane is perpendicular to the magnetic field in a time of 0.050 s. What is the magnitude of the average induced emf in the coil?
A) 6.0 V
B) 36 V
C) 45 V
D) 90 V
D
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An ant and an elephant are walking through the jungle. On which does the greater buoyant force act?
A. The elephant B. The ant C. The same buoyant force acts on both D. Neither is floating, so no buoyant force is acting at all
According to author Norman Mailer from his book Of a Fire on the Moon, quoted in the opening section,
A) powerful new science-based technologies are bringing about a better life on this planet. B) the creation of Earth was a beautiful and spiritually significant event for the human race. C) intelligent extraterrestrial life forms probably exist in many places, and may visit Earth in the near future. D) the establishment of a technology base on the moon is a crucial step in the exploration of the solar system. E) science is moving us rapidly along new paths, but we haven't stopped to consider where those paths might lead.
An astronomical unit is:
A. any planet's average distance from the Sun. B. any large astronomical distance. C. Earth's average distance from the Sun. D. none of the above.
Jupiter's colors come in part from its three layers of clouds. Which of the following is not the primary constituent of one of Jupiter's cloud layers?
A) clouds of sulfuric acid B) clouds of water C) clouds of ammonium hydrosulfide D) clouds of ammonia