The reason we don't have solar and lunar eclipses monthly is because of the
A) relatively close distance of the Moon and Earth.
B) relatively long distance to the Sun.
C) tapering of the Sun's rays.
D) different orbital planes for Earth and the Moon.
E) 23° tilt of the Earth's axis.
Answer: D
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From Earth, one satellite appears to overtake another. The faster satellite that is seen to overtake the other is
A) higher. B) lower. C) can't say
Each choice describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
A) Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. B) Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month. C) Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year. D) Earth's rotation defines a day. The Saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years.
A device obeying Ohm's law must have a resistance which
A) is proportional to voltage. B) is proportional to current. C) is constant. D) is zero.
A 2.00-kg block of ice at 0.00°C is dropped into a very large lake at 25.0°C and completely melts. For water, the heat of fusion is 3.35 × 105 J/kg,
the heat of vaporization is 2.25 × 105 J/kg, and the specific heat is 4190 J/kg?K. The net change in entropy of the system consisting of the ice and the lake due to this melting process is closest to A) 2.45 × 103 J/K. B) 2.24 × 103 J/K. C) 2.06 × 102 J/K. D) -2.45 × 103 J/K. E) -2.06 × 102 J/K.