What do we conclude if a planet has few impact craters of any size?
a. The planet was never bombarded by asteroids or comets.
b. Its atmosphere stopped impactors of all sizes.
c. Other geological processes have wiped out craters.
Ans: c. Other geological processes have wiped out craters.
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A new car manufacturer advertises that their car can go "from zero to sixty in 8 s." This is a description of
A) instantaneous speed. B) average speed. C) instantaneous acceleration. D) average acceleration. E) none of the given answers.
A parallel light beam containing two wavelengths, 480. nm and 700. nm, strikes a plain piece of glass at an angle of incidence of 60°. The index of refraction of the glass is 1.4830 at 480. nm and 1.4760 at 700. nm
Determine the angle between the two beams in the glass.
Heat death refers to the universe
A) reaching the lowest energy state possible, which will mean the greatest level of entropy. B) ending after a massive fire. C) reaching a state where all stars expand and merge into each other. D) reaching the point where the process of radioactive decay is no longer possible.
Which of the following objects is obeying Newton's laws of motion?
A. a satellite orbiting Earth B. a runner racing around a track C. a skydiver falling under the force of gravity D. a sleeping cat E. All of these choices are correct.