With the discovery of dark energy, what best defines critical density?
a) the correct a...
Physics, 15.10.2019 06:30 CeddHendrix
With the discovery of dark energy, what best defines critical density?
a) the correct amount of matter and energy to make the universe flat.
b) the density of dark energy needed to accelerate the universe's expansion.
c) the amount of matter needed to counteract dark energy.
d) the amount of matter and energy needed to hold galaxies together
Answers: 3
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Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0Ă—10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?
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