A harmonic longitudinal wave propagating down a tube filled with a compressible gas has the form s(x, t) = smcos(kx ? ?t). Its velocity can be obtained from
a. ?/k
b. k/?
c. k
d. ?
e. ?k
a
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The Oort Cloud is thought to be:
A) the cloud of gas and dust from which our solar system formed. B) a cloud of debris that occasionally encounters the Earth, causing a meteor shower. C) the spherical cloud of comets and some larger icy bodies surrounding the outer solar system. D) a cloud of asteroids moving between the orbits of Mars and Jupiter. E) the material in the ecliptic plane that creates the zodiacal light.
In a thundercloud the downdrafts are ________ and the updrafts are ________
A) warm; cold B) cold; warm C) fast; slow D) slow; fast
A spaceship is moving in a straight line away from Earth at 0.80c, measured relative to Earth
It launches a missile that moves away from the spaceship in the forward direction at 0.60c, relative to the ship. Relative to Earth, what is the speed of this missile? A) 1.4 c B) greater than c but less than 1.4c C) greater than 0.80c but less than c D) c
Twenty-five identical molecules are in a box. Microstates are designated by identifying the molecules in the left and right halves of the box. The multiplicity of the configuration with 15 molecules in the right half and 10 molecules in the left half is:
A. 1.03 × 1023 B. 3.27 × 106 C. 150 D. 25 E. 5