A person in a boat sees a fish in the water (n = 1.33), the light rays making an angle of 40° relative to the water's surface. What is the true angle (in degrees) relative to the water's surface of the same rays when beneath the surface?
a. 40
b. 35
c. 50
d. 55
e. 61
d
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If tonight is a full Moon then in about two weeks it will be a _______ Moon
Fill in the blank(s) with correct word
A solid lead sphere of radius 10 m (about 66 ft across!) has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only 540 N (about 120 lb). How large would this gravitational force be if the distance between the centers of the two spheres were tripled?
A. 60 N B. 180 N C. 1620 N D. 4860 N
A gas is quickly compressed in an isolated environment. During the event, the gas exchanged no heat with its surroundings. This process is
A) isothermal. B) isometric. C) isobaric. D) adiabatic.
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), what do we mean by fnow?
A) the fraction of civilizations in the universe that currently are sending messages to us B) the fraction of planets in the galaxy on which a civilization could theoretically develop right now C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets with civilizations at the present time (as opposed to only in the past or future)