The prediction from special relativity that the length of a moving object will be shortened in the direction of motion is
a. time dilation
b. length contraction
c. the equivalence of mass and energy
d. the principle of relativity
e. none of the above
B
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Induction: A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod
A. is repelled by the sphere. B. is attracted to the sphere. C. feels no force due to the sphere.
Which of the following is considered by biologists to be a likely place where life first arose on Earth?
A) on meteorites that landed on Earth B) on land surfaces that got moderately heavy rainfall C) in hot water near undersea volcanoes D) deep underground
For a bullet fired horizontally, its ________ velocity will retain a constant non-zero value until it is stopped.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not a member of the low-cloud family?
a. Nimbostratus cloud b. Fog c. Stratus cloud d. Cirrus cloud