In a galaxy like ours, the best place for life to form would be in the ________
Fill in the blank(s) with correct word
spiral arms
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The momentum of an isolated system is conserved
A) only in inelastic collisions. B) only in elastic collisions. C) in both elastic and inelastic collisions.
Graphical Addition: If three vectors add to zero, they must all have equal magnitudes.
A. True B. False
The term age of ancient life is sometimes used to refer to the ______________ era
Fill in the blank(s) with correct word
Today, the uranium found on Earth contains 0.720% 235U (with a half-life of 0.700 billion years) and 99.28% 238U
(with a half-life of 4.50 billion years). At a time 2.20 billion years ago, what percent of the uranium on Earth was 238U (assuming that no other uranium isotopes were present)? A) 8.68% B) 95.6% C) 2.18% D) 4.53% E) 6.29%