One of the reasons that Kapteyn underestimated the size of the Milky Way and Shapley overestimated it is that they did not recognize the ________.
A. dimming effect of interstellar dust
B. age of the globular clusters
C. effects of the motion of the Sun from the center
D. existence of dark matter
Answer: A
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The second step in the precipitation-hardening process is to _________the alloy to maintain a uniform distribution of atoms in the grains at low temperature.
Fill in the blank(s) with the appropriate word(s).
A 4-kg mass moving with speed 2 m/s, and a 2-kg mass moving with a speed of 4 m/s, are gliding over a horizontal frictionless surface
Both objects encounter the same horizontal force, which directly opposes their motion, and are brought to rest by it. Which statement correctly describes the situation? A) Both masses travel the same distance before stopping. B) The 2-kg mass travels twice as far as the 4-kg mass before stopping. C) The 2-kg mass travels farther, but not necessarily twice as far. D) The 4-kg mass travels twice as far as the 2-kg mass before stopping. E) The 4-kg mass loses more kinetic energy than the 2-kg mass.
A race car circles 10 times around an 8-km track in 20 min. What is its average speed per lap?
What will be an ideal response?
A heavy boy and a lightweight girl are balanced on a massless seesaw
If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw? Assume that both people are small enough compared to the length of the seesaw to be thought of as point masses. A) It is impossible to say without knowing the masses. B) It is impossible to say without knowing the distances. C) The side the boy is sitting on will tilt downward. D) Nothing will happen; the seesaw will still be balanced. E) The side the girl is sitting on will tilt downward.