Runaway convection in Earth's atmosphere can lead to a. snow.
b. destruction of ozone.
c. auroras.
d. acid rain.
e. violent storms.
e. violent storms.
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Precession of the rotation axis of Earth is caused by
a. the force of gravity from the sun and moon on Earth's equatorial bulge. b. the force of gravity from the sun and Jupiter on the Earth-moon system. c. the magnetic field of Earth. d. the formation and subsequent melting of glaciers during the ice-ages. e. the impact of asteroids.
What do astronomers mean when they say the universe is expanding?
A) Everything in the universe is gradually growing in size. B) Average distances are increasing between most galaxies. C) Average distances are increasing between most stars. D) The universe is expanding from a single point.
Three charges are placed as follows along the x- and y-axis of an xy-coordinate system: q1 = 2.00 ?C at x1 = 0 m, q2 = -4.00 ?C at x2 = 3.00 m, and q3 = 6.00 ?C at y = 4.00 m. What is the electric potential energy of this system of charges?
A) -40.2 mJ B) 40.2 mJ C) -94.2 mJ D) 94.2 mJ E) 0 J
Neutral hydrogen atoms are best studied from their energy given off as
A) 21-cm waves in the radio region. B) 0.2 nm as X-rays. C) 121.3 nm as Lyman alpha emission in the UV. D) red hydrogen alpha emission, at 656.3 nm. E) Neutral hydrogen gives off no detectable radiation, since it is cold, not hot.