Add the following lengths, each obtained from a different measuring instrument, and round off the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m
What will be an ideal response?
28.41
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Metric System: The metric system is preferred over the British system in science for the following main reason.
A. The metric system is more precise than the British system. B. Metric quantities can be defined more accurately than the quantities in the British system. C. Metric quantities are natural whereas British quantities are invented. D. Conversions between metric quantities are especially easy because they are all related by factors of ten.
The equation that solves a problem is 
. The problem is:
A. How far above its initial position does a rock travel in 2.0 s when thrown up from a point 40 m above the ground? B. How far below its initial position does a rock travel in 2.0 s when thrown up from a point 40 m above the ground? C. What is the position relative to the ground of a rock thrown up at 3.0 m/s from a roof 20 m above the ground 2.0 s after it is released? D. What is the change in position relative to the ground of a rock thrown up at 3.0 m/s from a roof 20 m above the ground 2.0 s after it is released? E. What is the position relative to the ground of a rock thrown up at 3.0 m/s from a roof 20 m above the ground if its maximum height is 33.6 m?
The very earliest Greek theory of the structure of the universe pictured Earth at the center with the planets revolving around it at an unchanging rate in simple circles. The Greeks later revised this theory because
A) they didn't believe the theory was sufficiently beautiful to represent the eternal gods. B) they observed that the planetary motions are irregular and include such things as retrograde motion. C) certain observations led them to the conclusion that Earth has a spherical shape. D) they came to believe that the sun should be at the center of things. E) Actually, the Greeks never did abandon this theory--the theory was not altered until the time of Copernicus.
Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube. By what factor is the rate of heat flow changed when the bar's cross-sectional area is doubled?
a. 2 b. 1/2 c. 4.0 d. 1/4