Cosmic Inflation refers to
A) an extremely rapid expansion of the early universe that occurred in an extremely brief period of time.
B) the fact that there is an ever increasing energy cost in order for fusion within stars to occur.
C) the phenomenon of matter within the universe is becoming increasingly disordered.
D) is another way of referring to the Big Bang itself.
Answer: A
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What would be the next step in the scientific process for the Copernican heliocentric model?
In 1500s, Copernicus reintroduced the heliocentric model that the ancient Greeks had rejected, and it began to gain favor among some scientists. He suggested that the planets all orbit around the Sun in perfect circles, as shown in the figure to the right. This offers a much more elegant explanation of retrograde planetary motion than the geocentric model.
Compared to the speed a satellite loses when traveling from nearest to farthest points from Earth, the speed gained when returning from farthest to nearest is
A) less. B) the same. C) more.
A gear shaft transmits torques TA 5 975 N?m, TB 5 1500 N?m, TC 5 650 N?m, and TD 5 825 N?m. If the allowable shear stress is 50 MPa, the required shaft diameter is approximately:
(A) 38 mm
(B) 44 mm
(C) 46 mm
(D) 48 mm
When a metal is illuminated by light, photoelectrons are observed provided that the wavelength of the light is less than 520 nm. What is the metal's work function? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 2.4 eV B) 2.6 eV C) 2.8 eV D) 3.0 eV