How can Kepler's Third Law be used to estimate the mass of the galaxy?
What will be an ideal response?
We can find the total mass interior to a star's orbit if we know its orbital period and distance from the Galactic center. Using the numbers for the Sun, in the appropriate units, the mass can be shown to be around 1011 times the mass of the Sun.
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Parallel rays of light that hit a concave mirror will come together
a. at the center of curvature. b. at the focal point. c. at a point half way to the focal point. d. at infinity.
Life emerged on Earth within about a billion years after the solar system formed
Indicate whether the statement is true or false
For which of the values below is x > x7?
a. x = –2.0 b. x = 0 c. x = 1.0 d. x = 2.0 e. x = 4.0
Jet planes avoid bad weather by flying above it in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.