Which of the following has virtually no effect on the internal structure of a planet?
A) its size B) its composition C) its magnetic field D) its mass
C
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Significant Figures: A train travels at a constant speed of 60.4 mi/h for 101.5 min. What distance does the train cover expressed to the correct number of significant figures?
A. 100 mi B. 102 mi C. 102.2 mi D. 102.18 mi E. 102.181 mi
Which sequence of formation is most likely to be correct, oldest to youngest?
A) globular clusters, open clusters, OB associations B) Population I stars, population II stars, population III stars C) halo, spiral arms, globular clusters D) planetary nebulae, Population I stars, population II stars E) emission nebulae, planetary nebulae, dark nebulae
The addition of salt to water affects its
A) crystal composition. B) freezing point. C) viscosity. D) liquidity. E) none of the above
A sinusoidally varying potential difference has amplitude 170 V. What is its average value?
1.170 V 2.120 V 3.0 4.-120 V 5.-170 V