When multiplying several quantities, the number of significant digits in the result must always be
A) larger than the number of significant digits in the most accurate of the quantities.
B) equal to the number of significant digits in the most accurate of the quantities.
C) equal to the average number of significant digits in the most and least accurate of the quantities.
D) equal to the number of significant digits in the least accurate of the quantities.
E) smaller than the number of significant digits in the least accurate of the quantities.
D
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What is the magnitude of the angle of dip at Earth's magnetic north pole?
Earth's magnetism arises from
A) charged particles at rest on Earth's surface and on clouds in the lower atmosphere. B) the Wizard of Oz. C) electric currents in Earth's interior. D) electric currents in the sun. E) electric currents in the upper atmosphere.
Infra-red radiation is produced by
A) mechanical oscillators that move air back and forth. B) molecules in thermal motion. C) nuclear vibrations. D) electric currents oscillating in human-made electronic devices. E) electrons orbiting around the nucleus in atoms.
A stone is thrown vertically upward. At the top of its vertical path the force acting on it is
A) zero. B) only the force due to gravity. C) due to air resistance. D) both due to gravity and air resistance.