The lower atmosphere is directly warmed
A) by incoming solar radiation.
B) by the emission of terrestrial radiation.
C) from the weight of the atmosphere above.
D) by the absorption of terrestrial radiation.
Answer: B
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A boulder rolls off of a very high cliff and experiences no significant air resistance. While it is falling, its trajectory is never truly vertical
A) True B) False
The primary evidence that the outer core is molten is an abrupt
A) increase in the velocity of P-waves, but no increase in S-waves. B) increase in the velocity of L-waves. C) stop of S-wave propagation, and a decrease in P-wave velocity. D) stop of P-wave propagation, and a decrease in S-wave velocity.
X-rays with a wavelength of 0.00100 nm are scattered at 130° by free electrons. What is the kinetic energy of each recoil electron?
(1 eV = 1.60 × 10-19 J, melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.50 MeV B) 0.99 MeV C) 2.0 MeV D) 0.34 MeV E) 0.68 MeV
Slanting Surfaces Without Friction: A 150-N crate is being pulled up a perfectly smooth ramp that slopes upward at 15° by a pull that is directed at 30° above the surface of the ramp. What is the magnitude of the pull required to make the crate move up the ramp at a constant velocity of 1.75 m/s?
Fill in the blank(s) with the appropriate word(s).