Terminal velocity is a term used to describe
A. the velocity of a train pulling into a terminal.
B. the constant velocity a falling object reaches when the net force is zero.
C. the force of air resistance on a sky diver.
D. the initial velocity of an object when in free fall.
B. the constant velocity a falling object reaches when the net force is zero.
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An index of refraction less than one for a medium would imply that
A) that the speed of light in the medium is the same as the speed of light in vacuum. B) that the speed of light in the medium is greater than the speed of light in vacuum. C) that the speed of light in the medium is less than the speed of light in vacuum. D) refraction is not possible. E) reflection is not possible.
The event horizon of a black hole is the point where _____
a. the mass of the black hole is concentrated in a singularity b. the accretion disk around the black hole contacts its surface c. the escape velocity equals the speed of light d. tidal forces ionize infalling gas e. an infalling particle reaches equilibrium with radiation pressure
O and B stars only occur in the galactic _______________
Fill in the blank(s) with correct word
The most well-known impact crater in North America is
A) Crater Lake in Oregon B) Meteor Crater in Arizona C) Great Crater in Iowa D) Odessa Crater in Texas