Galaxies in all directions appear to be redshifted, as if rushing away from us in the center of the universe. How does the cosmological principle handle this problem?
What will be an ideal response?
It is not just us, but everyone, everywhere who witnesses the same cosmological redshift, as all space and time expand in the Big Bang. Since space itself is expanding, there is no preferred direction and no center to the universe.
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Clouds occur when moist air is cooled by
A) expansion when it rises. B) compression when it rises. C) expansion when it falls. D) compression when it falls.
A 50.0-mH inductor is connected in series with a 2500-? resistor. What is the phase angle at 3000 Hz?
A) 20.7° B) - 20.7° C) -75.9° D) 75.9° E) 90.0°
Decreasing the aperture diameter of a camera lens by a factor of three will change the f-number by what factor?
a. 3 c. 1/9 b. 9 d. 1/3
The average distance from Earth to the Sun is about _____
A) 23 million miles B) 53 million miles C) 73 million miles D) 93 million miles