Consider the following three hypothetical planets orbiting a star with the same mass as the Sun (one solar mass):
Planet X: one Earth mass and 1 AU from the star
Planet Y: two Earth masses and 1 AU from the star
Planet Z: two Earth masses and 2 AU from the star
The shortest orbital period belongs to (Ignore very small differences in orbital period that might be attributed to the planet masses alone.)
A) Planet X alone
B) Planet Y alone
C) Planet Z alone
D) Planets X and Y, which have about the same orbital period
E) Planets Y and Z, which have about the same orbital period
F) all three planets, since they all have about the same orbital period
D) Planets X and Y, which have about the same orbital period
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What are the dark blobs (indicated by the red arrows) in this photograph from the Hubble Space Telescope?
A) cold, dense molecular clouds in which stars are forming B) warm atomic hydrogen gas, much like most of the gas in the galaxy C) tall interstellar bubbles blown out by supernovae or stellar winds D) jets of hot gas shot out from young binary star systems
At time D, is the expansion of the universe accelerating, coasting, or decelerating?
What will be an ideal response?
A 10-N falling object encounters 4 N of air resistance. The net force on it is
A) 0 N. B) 4 N. C) 6 N. D) 10 N.
Which process will double the power given off by a resistor?
a. doubling the current while making the voltage half as big b. doubling the current while doubling the resistance c. doubling the current by doubling the voltage d. doubling the current by making a resistance half as big