Which of the following is a unit of energy?
a. kilowatt-hour
b. newton
c. joules per second
d. newton-second
e. none of these
a
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Brown dwarfs are
A) stars in the process of forming B) very cool, low mass stars of spectral type M C) the burnt out cores of dead stars D) objects with insufficient mass to sustain nuclear fusion in their cores
Which of the following describes volcanism?
A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
Two cars that have the same mass are moving around a circular track at the same constant speed. The track is perfectly level. If car 1 is at the inner edge of the track and car 2 is at the outer edge, then
A. the frictional force on car 1 is greater than the frictional force on car 2. B. the frictional force on car 1 is less than the frictional force on car 2. C. the frictional force on both cars is zero. D. the frictional forces on both cars are equal and greater than zero.
When viewing a seascape, what is a major difference in the effect of wearing polarizing sunglasses versus sunglasses that simply cut down on intensity?
What will be an ideal response?