How much work is needed to carry an electron from the positive terminal to the negative terminal of a 9.0-V battery. (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A) 1.6 × 10-19 J
B) 17 × 10-19 J
C) 14.4 × 10-19 J/C
D) 9.0 J
E) 14.4 × 10-19 J
E
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The frost line of the solar system was located approximately between
A) the Sun and the present-day orbit of Mercury. B) the present-day orbits of Mercury and Venus. C) the present-day orbits of Mars and Jupiter. D) the present-day orbits of Venus and Earth. E) the present-day orbits of Uranus and Neptune.
Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is
A) 6 m/s. B) 10 m/s. C) 14 m/s. D) none of the above
How much current must flow through a long straight wire for the magnetic field strength to be 1.0 mT at 1.0 cm from a wire? (?0 = 4? × 10-7 T ? m/A)
A) 9.2 A B) 50 mA C) 50 A D) 16 A E) 5.0 mA
Assuming the impact hypothesis is correct, in what way(s) was the impact important to our existence on Earth today?
A. Water from the impact-generated tsunami explains why regions of North America are agriculturally fertile today. B. The iridium and other metals brought to Earth by the impact have proven to be very important for modern electronic devices. C. Prior to the impact, early humans had been threatened by dinosaurs, but after the impact they were free to develop civlization. D. It seems unlike that we would have evolved by now without the extinctions caused by the impact.