To weaken a bar magnet
A) drop it on a hard surface.
B) put it in hot flames.
C) whack it with a hammer.
D) all of the above
E) none of the above
Answer: D
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What do we learn by studying chondrites?
a. Earth's early composition b. the history of comets from the Oort cloud c. the different formations of the Terrestrial and Jovian planets d. the steps in planetary differentiation e. the conditions and processes from the early days of the solar nebula
Which kind of vaporization can occur at any temperature between the freezing and boiling points of a substance?
What will be an ideal response?
Simple harmonic motion is
A) any motion that results in a pure tone. B) a combination of overtones. C) a vibration with a restoring force proportional and opposite to a displacement. D) all of the above.
If a ray of light passes from air into glass, the angle of incidence will be
a. less than the angle of refraction. b. sometimes greater and sometimes less than the angle of refraction. c. greater than the angle of refraction. d. equal to the angle of refraction.