A 20 solar mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a
A) day.
B) week.
C) month.
D) year.
E) century.
A
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The tarp covering on a trailer or truck puffs upward for fast-moving vehicles, which illustrates
A) Pascal's principle. B) Archimedes' principle. C) the principle of continuity. D) Bernoulli's principle.
Write Darcy’s law for permeability processes.
What will be an ideal response?
This diagram represents a simplified model of the celestial sphere. The unlabeled circle that is highlighted in purple represents
A) the celestial equator. B) the meridian. C) the ecliptic. D) the spring equinox.
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m b. 15.8 m c. 13.5 m d. 11.0 m e. 4.9 m