When snow forms in clouds, the surrounding air is
A) cooled.
B) warmed.
C) both of these
D) none of the above
Answer: B
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The excited state of a certain atom is 3.2 eV ± 0.21 eV
(a) What is the average lifetime of this state? (b) If the excited energy doubled (6.4 eV ± 0.21 eV) how would the lifetime be affected?
Thanks to interferometry, a properly spaced set of 10-meter radio telescopes can achieve the angular resolution of a single, 100-kilometer radio telescope.
a. Yes, but with much lower sensitivity than a single, 100- kilometer telescope. b. Yes, and the resulting interferometer will have exactly the same properties as a single, 100-kilometer telescope. c. No, interferometry only works over much smaller distances. d. No, the blurring effects of Earth’s atmosphere limit the achievable angular resolution.
Slanting Surfaces With Friction: A 200-g hockey puck is launched up a ramp that is inclined at a 30° angle above the horizontal. The coefficients of static and kinetic friction between the puck and the ramp are µs = 0.40 and µk = 0.30, respectively, and the puck's initial velocity at the base is 3.8 m/s parallel to the sloping surface of the ramp. What speed does the puck have when it slides back down to its starting point?
Fill in the blank(s) with the appropriate word(s).
Most of the elements found on Earth were created
A. in the first few million years of the Earth's existence B. within a star C. in the Big Bang D. in a supernova explosion