Mercury's most unusual orbital feature, as compared to the other planets, is
A) the size of its orbit.
B) the shape of its orbit.
C) its orbital period.
D) the size of the planet.
E) that it has no moons.
B
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In the equation: Number of Civilizations = Np × flife × fcivilization × fnow what do we mean by fnow?
A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us
A 360-nm thick oil film floats on the surface of a pool of water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively
When the surface of the oil is illuminated from above at normal incidence with white light, what is the wavelength of light between 400 nm to 800 nm wavelength that is most weakly reflected? A) 520 nm B) 540 nm C) 560 nm D) 580 nm E) 600 nm
Sound travels as a transverse wave in air and other materials
Indicate whether the statement is true or false
A mass on a spring vibrates in simple harmonic motion at a frequency of 8.0 Hz and an amplitude of 2.0 cm. If a timer is started when its displacement is a maximum (hence x = 2.0 cm when t = 0), what is the speed of the mass when t = 3.0 s?
a. zero b. 100 m/s c. 3.0 m/s d. 2.0 m/s e. 50 m/s