Before about 4 billion years ago the universe was:
A) radiation dominated.
B) quark dominated.
C) lepton dominated.
D) matter dominated.
E) dark energy dominated.
D
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Radiation pressure: The total electromagnetic power emitted by the sun is 3.8 × 1026 W. What is the radiation pressure it exerts on the perfectly absorbing surface of a satellite near the orbit of Mercury, which is 5.8 × 1010 m from the sun? The radiation strikes the surface of the satellite perpendicular to the surface. (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
The concept of hydrostatic equilibrium is critical to understanding how the Sun has remained stable long enough for live to evolve here
Indicate whether the statement is true or false
What is true about Antares?
A: name means "Rival of Mars" B: ˜700 times the size of the Sun C: possibly egg-shaped D: cooler than the Sun E: all of the above
A car is going around a banked curve at a high rate of speed. For the car not to skid, in which direction does the frictional force act?
A. Up the plane. B. Down the plane. C. Directly towards the center of the curve.