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

Physics & Space Science

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Write Darcy’s law for permeability processes.

What will be an ideal response?

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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.

Physics & Space Science

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.

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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

Physics & Space Science