Galaxies in all directions are observed to be streaming away from us as if we were in the center of the universe
Contrast this impression with the Cosmological Principle and explain why a simple-minded interpretation of the Hubble expansion is incorrect.
If we are at the center of the universe that contradicts the cosmological principle which says that no point is in any way different from any other point. It is not that everything is moving away from us per sec, it is that everything is moving away from everything else. No matter where we might be, we would observe that everything moved away from us.
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Current geological evidence suggests that life
A) took billions of years to appear B) appeared as soon as the Earth formed C) appeared quite early in Earth's history D) appeared relatively recently in Earth's history
The two nuclei used for the fuel in fission bombs are
A) 235Th and 235U. B) 234Th and 238U. C) 235U and 239Pu. D) 238U and 239Pu. E) 234Th and 239Pu.
When more people ride upward in an elevator, more power is required
Indicate whether the statement is true or false
A refrigerator condenser is a heat exchanger that converts a refrigerant from a vapor to a liquid at constant pressure and approximately constant temperature. If ammonia is used as a refrigerant and 10 kg/s is condensed at 25ºC when the surrounding temperature is 20ºC, determine the heat transfer from the refrigerant using data from the Appendix Chart C-7.
What will be an ideal response?