A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s
b. 2.7 m/s
c. 4.9 m/s
d. 2.4 m/s
e. 3.6 m/s
B
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The path of the light in raindrops that produces a single rainbow consists of
A. 2 refractions B. 3 refractions C. 2 total internal reflections D. 2 refractions and 1 total internal reflection
A solar or lunar eclipse will occur
a. when the Sun is near the line of nodes of the Moon, and the Moon is new or full.
b. any time the Moon is new or full.
c. when the Sun is near the solstice, and the Moon is new or full.
d. half-way through an eclipse year.
e. when the Sun is near the equinox, and the Moon is new or full.
What will happen to Triton in the distant future, based on its present orbit?
What will be an ideal response?
When we look into the band of light in our sky that we call the Milky Way, can we see distant galaxies? Why or why not? (Assume we are looking with visible light telescopes.)
A) Yes, distant galaxies appear as small, fuzzy patches of light within the Milky Way band. B) yes, but only when we look in the direction of the constellation Sagittarius C) no, because the stars, gas, and dust of the Milky Way block our view of more distant objects D) no, because galaxies exist only above and below the plane of the Milky Way E) no, because distant galaxies are too dim to be seen even with powerful telescopes