The ozone layer is
a. transparent to ultraviolet radiation.
b. opaque to ultraviolet radiation.
c. opaque to visible light.
d. opaque to infrared radiation.
e. responsible for producing most of the oxygen that animal life needs.
B
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A long thin rod of length L has a linear density ?(x) = Ax where x is the distance from the left end of the rod. (a) How far is the center of mass of the rod from the left end of the rod? (b) What is the mass of the rod?
What will be an ideal response?
Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
A) Determining longitude requires mathematical techniques that were not known at the time. B) Determining longitude requires much more precise measurements of angles in the sky than does latitude. C) Determining longitude requires accurate tables of the celestial coordinates of stars, while determining latitude does not. D) Determining longitude requires an accurate clock, but latitude does not.
Which of the following is most important in causing a cloud of gas to collapse to form a star and planets?
A) Gravity pulls all the gas inward. B) Pressure from other gas clouds pushes the gas inward. C) Opposite charges in the gas attract. D) Some gas is sent outward, causing the rest to move inward to conserve momentum. E) Pressure from light from nearby stars pushes the gas inward.
At the very small-scale level, matter is
A) nearly at rest. B) subject only to the strong nuclear force. C) really made of tiny pieces of pizza. D) in rapid motion. E) very cold.