If the carbon isotope evidence does indicate life 3.85 billion years ago, it suggests that life must have been widespread at that point
Indicate whether the statement is true or false
TRUE
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Significant Figures: Add the following lengths, each obtained from a different measuring instrument, and round the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m.
Fill in the blank(s) with the appropriate word(s).
painter of weight W climbs a ladder of weight W/3 and length L. At the position shown in the figure, the ladder begins to slip. Assume that there is a frictionless roller at A. What is the coefficient of static friction, ?s , at B?
(A) 0.19
(B) 0.33
(C) 0.68
(D) 0.24
(Choose all that apply.) An observatory in space could in principle detect
A) visible light. B) x-rays. C) infrared light. D) ultraviolet light. E) radio waves. F) gamma rays.
Which person’s watch (if any) measures the coordinate time ?t between those events in some inertial frame?
A. The rider in the merry-go-round B. The person standing on the ground C. Both D. Neither