Why is Io's orbit about Jupiter slightly elliptical?
A) because of tidal forces due to Jupiter
B) because Io was captured
C) because of orbital resonances with the other three Galilean moons
D) because of a giant impact which occurred in the past
C
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The eccentricity of a perfectly circular orbit is 1
Indicate whether the statement is true or false
The atmospheric pressure on Venus
A) shows an extreme change with the seasons. B) is much lower than on Earth. C) is about the same as on Mercury. D) is much higher than on Earth. E) causes variations in surface temperature.
Draw a schematic (not to scale) of filaments, walls, and voids, labeling each
What will be an ideal response?
Frank says that if you release the string when swinging a ball in a horizontal circle, the ball flies out in the radial direction defined by the string at the instant you release the ball. John says that it flies out along a tangent line perpendicular to the string, and that it then drops straight down to the ground. Which one, if either, is correct?
A. Frank, because the centrifugal force is no longer counteracted by the string. B. Frank, because balls naturally fly straight out. C. John, because there is no centrifugal force. D. John, because balls fall straight down when released. E. Neither, because although there is no centrifugal force, and the ball's velocity is tangent to the circle at the instant of release, the ball then follows a parabolic trajectory.