What is the most likely reason that there are no giant planets beyond Neptune?
A) Any planets forming beyond Neptune would have drifted out of the solar system due to the weakness of the Sun's gravity at this distance.
B) There was no material to create planetesimals beyond the orbit of Neptune.
C) By the time planetesimals grew to a large enough mass to hold onto an atmosphere, the solar nebula had been blown away.
D) Any planet forming beyond Neptune's orbit would have been scattered outside of the solar system by gravitational encounters.
E) There may be, but they would be so faint that astronomers have not found them yet.
C
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Equation of Traveling Waves: Four waves are described by the following equations, where distances are measured in meters and times in seconds.I. y = 0.12 cos(3x - 21t)II. y = 0.15 sin(6x + 42t)III. y = 0.13 cos(6x + 21t)IV. y = -0.23 sin(3x - 42t)Which of these waves have the same speed?
A. I and II B. I and III C. II and III D. III and IV E. II and IV
According to Einstein’s theory of special relativity, a stationary observer measures
A. a shorter length of an object than a moving observer measures B. a longer length of an object than a moving observer measures C. the same length of an object than a moving observer measures
When water vapor condenses out at the cool tops of convection cells, what happens?
A) It rains. B) It snows. C) Clouds form. D) A hurricane forms. E) A tropical depression forms.
A railroad car of mass m and speed v collides and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system
A) is the same as before. B) is half as much as before. C) is one third as much as before. D) is one fourth as much as before. E) is one quarter as much as before.