All the following statements are true. Which one explains the reason that there is not a solar eclipse at every new moon?
A) The nodes of the moon's orbit precess with an 18-year period.
B) The orbital plane of the Moon is tilted slightly (by about 5 degrees) to the ecliptic plane.
C) The Moon is only about one-fourth as large as Earth in diameter.
D) The Moon goes through a complete cycle of phases about every 29-1/2 days.
B) The orbital plane of the Moon is tilted slightly (by about 5 degrees) to the ecliptic plane.
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None of the Jovian worlds has a definite solid surface on which you could walk
Indicate whether the statement is true or false
If the conditions required for substantial amounts of oxygen to build up in a planetary atmosphere are quite rare, then life on other worlds
A) will probably not be present B) will progress much more rapidly because there would be less oxidation C) will progress at a similar rate as that on the Earth, except that it will remain anaerobic D) may still be common but may never be able to evolve past microscopic forms
A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery
(a) the voltage across the capacitor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.
When the distance between a pair of stars decreases by half, the force between them
A) decreases by one-quarter. B) decreases by one-half. C) increases to twice as much. D) increases to four times as much. E) stays the same.