Components: If a vector 
has components Ax < 0, and Ay > 0, then the angle that this vector makes with the positive x-axis must be in the range
A. 0° to 90°.
B. 90° to 180°.
C. 180° to 270°.
D. 270° to 360°.
E. It cannot be determined without additional information.
Answer: B
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A. type O; type A; emission lines B. type M; type A; absorption lines C. type A; type M; emission lines D. type M; type O; Balmer lines E. type O; type M; Balmer lines
You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal
A) True B) False
To make a p-type semiconductor from silicon, one element that might be added as an impurity is ________.
Fill in the blank(s) with the appropriate word(s).
When does a protostar become a true star?
A) when the star is 1 million years old B) when the central temperature reaches 1 million Kelvin C) when nuclear fusion begins in the core D) when the thermal energy becomes trapped in the center E) when the stellar winds and jets blow away the surrounding material