The energy source responsible for molecular motions in Earth's atmosphere is
A) their own natural kinetic energy.
B) pressure caused by the weight of air.
C) atmospheric tides.
D) the Sun.
Answer: D
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A) Increase the tilt of the planet's rotation axis. B) Increase the greenhouse gas content of the planet's atmosphere. C) Move the planet closer to the Sun. D) Make the planet rotate more slowly.
A 70-kg laboratory technician absorbs 2.9 mJ of 0.50-MeV gamma rays in a workday. How many gamma-ray photons does the technician absorb in a workday?
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A 40-?C charge is positioned on the x axis at x = 4.0 cm. Where should a ?60-?C charge be placed to produce a net electric field of zero at the origin?
A. ?5.3 cm B. 5.7 cm C. 4.9 cm D. ?6.0 cm E. +6.0 cm
A car by itself is capable of a certain maximum acceleration. When it tows a twice-as-massive car, its maximum acceleration is
A) one-half. B) one-third. C) one-fourth. D) the same. E) none of these