A simple refracting telescope provides large magnification by employing
A) a short focal length objective and a short focal length eyepiece.
B) a short focal length objective and a long focal length eyepiece.
C) a long focal length objective and a short focal length eyepiece.
D) a long focal length objective and a long focal length eyepiece.
C
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What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's center? Hint: ; G = 6.67 10^-11 m3/s2/kg
a. 0.2 m/s b. 2 m/s c. 20 m/s d. 200 m/s e. 2,000 m/s
When did humans learn that the Earth is not the center of the universe?
A) within the past 500 years B) about 2,500 years ago C) about 1,000 years ago D) We haven't; there is still considerable scientific debate about whether Earth is the center of the universe.
Generally speaking, the larger a nucleus is, the greater its
A) stability. B) instability. C) neither stability nor instability
When atmospheric pressure increases, what happens to the absolute pressure at the bottom of a pool?
A) It does not change. B) It increases by a lesser amount. C) It increases by the same amount. D) It increases by a greater amount. E) It depends on the depth of the pool.