Technically, its not mass that causes the curvature of spacetime, but
A) mass density.
B) energy density.
C) thermal mass.
D) thermal mass fluctuations.
Answer: A
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What is meant by the redshift?
A. Distant galaxies appear red in color as their light passes through dust. B. The temperature of distant galaxies is decreasing. C. The spectral lines of the galaxies are shifted to redder wavelengths. D. Distant galaxies appear red in color due to having older stars. E. None of these choices is correct.
A 200-kg flat-bottomed boat floats in fresh water, which has a density of 1000 kg/m3. If the base of the boat is 1.42 m wide and 4.53 m long, to what depth is the bottom of the boat submerged when it carries three passengers whose total mass is
A) 7.10 cm B) 7.53 cm C) 7.95 cm D) 8.52 cm
Identical waves superimposed out of phase produce a wave of decreased
A) amplitude. B) frequency. C) wavelength. D) all of the above E) none of the above
Will Mars ever appear to the unaided eye as large as the Moon at closest approach? Explain
What will be an ideal response?