The meter is currently defined as
A) the distance between two etched lines in a platinum-iridium bar kept in S vres, France.
B) the distance between two etched lines in a platinum-iridium bar kept in Washington, D.C.
C) one ten-millionth of the distance between the North pole and the equator.
D) the distance traveled by light in 1/299,792,458 of a second.
E) 1,553,164.1 wavelengths of red cadmium light in dry air at 25°C.
D
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At time B, is the expansion of the universe accelerating, coasting, or decelerating?
What will be an ideal response?
If a spinning object's radius shrinks by a factor of 5, its rotation velocity will
A. get 10 times faster. B. get five times slower. C. get five times faster. D. get 25 times faster. E. remain the same.
A simple pendulum, 2.0 m in length, is released from rest when the support string is at an angle of 25° from the vertical. What is the speed of the suspended mass at the bottom of the swing?
As seen in 1987, when two silicon 28 nuclei fuse, or when seven alpha particles are added to a Si-28 nucleus, the initial result in either case is:
A) the shedding of bipolar planetary nebula shells. B) a nova explosion. C) iron 56. D) cobalt 56. E) nickel 56.