The diameter of the Moon is 3.78 × 106 m. It subtends an angle of 0.00982 radians at the surface of Earth. How far is the Moon from Earth?
What will be an ideal response?
3.85 × 108 m
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An observer on Earth's equator would find _______
a. the celestial equator passing at 45 degrees above the northern horizon. b. The celestial equator passing at 45 degrees above the southern horizon. c. that the celestial equator coincides with the horizon. d. the celestial equator passing directly overhead. e. None of the above are true.
In general, which things below are affected by a magnetic field?
A) charged particles or magnetized materials (such as iron) B) rocks of all types C) iron-bearing minerals only D) bases and liquids
A baseball pitcher throws a curveball, and Bernoulli's Principle gives a fair description of why it takes such a drastic curve. If that pitcher could throw the exact same pitch on the Moon, then
A. it would curve more drastically, because gravity is so much weaker on the Moon. B. it would curve but not as much as on Earth, since the Moon's gravity is so weak. C. it would curve more drastically, because there is no counterforce from air pressure on the Moon. D. it would not curve at all, because the Moon has no atmosphere.
New telescopes are using "adaptive optics.". What is that?
a. using parabolic instead of spherical mirrors b. using computer image processing to enhance images c. building mirrors in hexagonal segments d. continually adjusting the mirror's shape during observations