In a 2-dimensional Cartesian system, the y component of a vector is known, and the angle between vector and x axis is known. Which operation is used to calculate the magnitude of the vector (taken with respect to the y component)?
a. dividing by cosine
c. multiplying by cosine
b. dividing by sine
d. multiplying by sine
B
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Why do we think Mercury contracted within about a billion years after it formed?
What will be an ideal response?
In essence, the nebular theory holds that ________
A) the planets each formed from the collapse of its own separate nebula B) our solar system formed from the collapse of an interstellar cloud of gas and dust C) nebulae are clouds of gas and dust in space D) The nebular theory is a discarded idea that imagined planets forming as a result of a near-collision between our Sun and another star.
If a foreign atom is more than _____________% larger than its host, it normally does not form a continuous substitutional solid solution.
Fill in the blank(s) with the appropriate word(s).
On Earth the starting point of longitude is Greenwich, England. On the celestial sphere, what is the starting point of the right ascension?
Autumnal Equinox Vernal Equinox Summer solstice Winter solstice