The Sun is supported against the crushing force of its own gravity by ________.

A. the force exerted by escaping neutrinos
B. gas pressure
C. its rapid rotation
D. quantum forces
E. magnetic forces


Answer: B

Physics & Space Science

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Compared to the average size of a hydrogen atom, the average size of a helium atom is

A) larger. B) smaller. C) about the same.

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So which is closer?

A: Menkent B: Hadar C: Can't tell

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A 4.0 kg box of fruit slides 8.0 m down a ramp, inclined at 30.° from the horizontal. If the box slides at a constant velocity of 5.0 m/s, the work done by gravity is

A) +78. J. B) 0.16 kJ. C) -78. J. D) zero. E) -0.16 kJ.

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Venus's tectonic processes seem to be vertical rather than horizontal

a. True b. False Indicate whether the statement is true or false

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