A lunar eclipse can occur only when the Moon is in or near the ______________ phase
a. new
b. first-quarter
c. last-quarter
d. full
d
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A spaceship traveling at constant speed away from the Sun crosses the orbit of Earth and later crosses the orbit of Mars
What is the distance between these two events in the spaceship frame of reference? The radius of Earth's orbit is 150 × 109 m and that of Mars is 228 × 109 m.
Eratosthenes used simple geometry to determine the distance between Alexandria to Syene so that he could calculate Earth's_______________
Fill in the blank(s) with correct word
Energy Levels: A neutral boron atom has 5 electrons, but in this case all but one of its electrons have been knocked off. How much energy (in electron-volts) is needed to remove the last electron?
Fill in the blank(s) with the appropriate word(s).
Two forces are applied to a doorknob, perpendicular to the door. The first force is twice as large as the second force. The ratio of the torque of the first to the torque of the second is
A) 1/4. B) 1/2. C) 2. D) 4. E) 8.