Which of the following is an important starting assumption in models of galaxy formation?
A) Some regions in the universe start out denser than others.
B) Galaxies form first, then black holes.
C) All galaxies start out as spiral galaxies.
D) Black holes form first, seeding the formation of galaxies.
A) Some regions in the universe start out denser than others.
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An astronaut on a strange new planet having no atmosphere finds that she can jump up to a maximum height of 27 m when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration due to gravity on the planet?
What will be an ideal response?
The circuit below contains three 100-watt light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) the brightest?
a.
A
b.
B
c.
C
d.
B and C
e.
All three are equally bright.
Which of these colors of light has photons of lowest energy?
a. Blue b. Green c. Yellow d. Red
Which three worlds have almost identical densities?
A) Mercury, Mars, and our Moon B) Mercury, Venus, and Earth C) Earth, Moon, and Mars D) Mercury, Earth, and Mars E) Deimos, Phobos, and our Moon