During the inflation that started at about 10^-37 seconds after the Big Bang, the universe expanded by:
a. up to 10^50 in as little as 10^-47 seconds.
b. up to 10^42 in as little as 10^-40 seconds.
c. up to 10^30 in as little as 10^-36 seconds.
d. by about a factor of 10 up to the present time.
e. by no significant amount.
c
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How does the Sun's mass compare to Earth's mass?
A) The Sun's mass is about 300,000 times the mass of the Earth. B) The Sun's mass is about 30 times the mass of the Earth. C) Both have approximately the same mass. D) The Sun's mass is about 300 times the mass of the Earth.
A bullet is dropped into a river from a very high bridge at the same time as another bullet is fired straight downward from a rifle. Neglecting air resistance, the acceleration just before striking the water is
A) greater for the dropped bullet. B) greater for the fired bullet. C) the same for each bullet. D) none of the above
The electric field just outside the surface of a hollow conducting sphere of radius 20 cm has a magnitude of 500 N/C and is directed outward. An unknown charge Q is introduced into the center of the sphere and it is noted that the electric field is still directed outward but has decreased to 100 N/C. What is the magnitude of the charge Q?
a. 1.5 nC b. 1.8 nC c. 1.3 nC d. 1.1 nC e. 2.7 nC
In the context of blackbody radiation, which of the following statements is true of stars?
A) Temperatures of stars cannot be estimated from their color. B) Red stars are cool, and blue stars are hot. C) Red stars are hot, and blue stars are cool. D) Star temperatures cannot be measured using the relative strengths of various spectral lines.