By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding
A) All galaxies contain billions of stars, and all galaxies have spiral shapes.
B) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going.
C) All galaxies were born at the same time, and all will die at the same time.
D) All galaxies outside the Local Group are orbiting the Local Group.
E) All galaxies outside the Local Group are moving away from us, and all are moving away at nearly the same speed.
B
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A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1 . (Assume the room temperature is 70°F.)
a. 217 b. 180 c. 90 d. 68 e. 850
The best answer to both the flatness and horizon problems is:
A) the Steady State Theory. B) the GUT theory. C) the inflationary epoch. D) dark energy. E) decoupling.
An object transported from Earth's surface to the surface of the Moon has
a. the same mass, but different weight. b. the same weight, but different mass. c. the same mass and the same weight. d. different mass and different weight. e. none of these.
Of all the forms of electromagnetic radiation, the one with the lowest frequency is
A) gamma rays. B) ultraviolet rays. C) visible light. D) microwaves. E) radio waves.