Our home galaxy is called _______________
a. M31
b. the solar system
c. the Milky Way
d. Andromeda
c
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Projectile Motion: Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? (There could be more than one correct choice.)
A. The speed of the object is constant but its velocity is not constant. B. The acceleration of the object is +g when the object is rising and -g when it is falling. C. The acceleration of the object is zero at its highest point. D. The speed of the object is zero at its highest point. E. The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.
Without the greenhouse effect, the oceans on the Earth's surface would
A) have evaporated B) be much the same as they are today C) have covered the entire surface of the Earth D) be frozen
The Ga-As phase diagram has a compound GaAs (?-phase) that is a single vertical line at 50 atomic % As. Can ?-phase be produced that has 55 atomic % As? _____________
Fill in the blank(s) with the appropriate word(s).
A second magnitude star in Ursa Major is brighter than a fourth magnitude star in Orion
Indicate whether the statement is true or false