Which of the following is true of first-magnitude stars?
A) They are the stars with the greatest flux.
B) They are the smallest stars in a constellation.
C) They are the oldest stars in a constellation.
D) They are the stars that are farthest from Earth.
A
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A spring stretches by when a object is attached. What is the weight of a fish that would stretch the spring by
A) 199 N B) 91.0 N C) 145 N D) 279 N
A movie projector is equipped with a 0.5-meter focal length lens that is positioned 0.506 meters from the film. (a) How far from the lens must the screen be if the image on it is to be in focus? (b) How many times larger is the image than the object? (c) Is the image produced a real or a virtual image?
What type of rocket engine is used by the Space Shuttle?
A) chemical rocket B) nuclear rocket C) matter-antimatter rocket D) ramjet E) beamed energy propulsion
For a mass hanging from a spring, the maximum displacement the spring is stretched or compressed from its equilibrium position is the system's
A) frequency. B) acceleration. C) period. D) amplitude.