The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is __________
Fill in the blank(s) with correct word
140 years
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When a boxer moves into an oncoming punch, the force experienced is
A) decreased.
B) increased.
C) no different, but the timing is different.
D) all of the above
The planets (other than Earth) known to ancient Western cultures were ________.
A. Mercury, Mars, Jupiter, and Saturn B. Venus, Mars, Jupiter, and Saturn C. Venus, Jupiter, Saturn, Uranus, and Neptune D. Mercury, Venus, and Mars E. Mercury, Venus, Mars, Jupiter, and Saturn
Which of the following is not a way light and matter interact?
A) emission B) scattering C) transmission D) absorption E) evaporation
The amount of dark matter in the universe is
A) about the same as the amount of visible matter. B) many times more than the amount of visible matter. C) about twice as much as the amount of visible matter. D) many times less than the amount of visible matter. E) entirely unknown at the present time.