The half-life of a radioactive substance is affected by
A) pressure.
B) temperature.
C) age.
D) all of the above
E) none of the above
Answer: E
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A given net force propels an object along a straight-line path. If the net force were doubled, its acceleration would
A) quadruple. B) double. C) stay the same. D) be half. E) none of the above
When you pull an object, such as a table, across the floor, the forward force by you on the table is equal but opposite to the backward force by the table on you
It seems as though these two forces should balance out, so that the table can't be moved. But the table does move, because A) the force by you on the table is larger than the force of the table on you. B) the floor pushes forward on the table. C) the momentum always acts in a forward direction. D) only one of these two forces actually acts on the table. E) Newton's laws do not apply to the table considered as a separate object.
An astronaut falling into a black hole would see events toward the singularity
1) red shifted, 2) blue shifted, 3) with no shift, and she would see events from the outside normal universe 4) red shifted. 5) blue shifted. 6) with no shift.
When a sine wave is used to represent a sound wave, the crest corresponds to
a. rarefaction. b. condensation. c. point where molecules vibrate at a right angle to the direction of wave travel. d. region of low elasticity.