Volcanism is apparent on many objects in the solar system. However, volcanic activity is known to be currently occurring only on Earth and Jupiter's satellite____________________
Fill in the blank(s) with correct word
Io
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Suppose the gravitational potential energy for a mass at an altitude of one Earth radius is PE1 and at two Earth radii is PE2 . How do the absolute values of these potential energies compare?
a. |PE1| = 2|PE2| b. |PE1| = 4|PE2| c. |PE1| < 2|PE2| d. |PE1| > 2|PE2| but is not equal to 4|PE2|
For uniformly accelerated motion, which of the following quantities must be zero?
a. the initial acceleration b. the initial velocity c. the initial displacement d. the time rate of change of the acceleration e. the time rate of change of the velocity f. the time rate of change of the displacement
In which general direction should you look to see the Moon set?
A) north B) south C) east D) west E) It depends on the phase of the Moon.
Why do sunspots appear dark?
A) They are regions that are significantly cooler than the rest of the photosphere. B) They are thick clouds on the sun, blocking its light. C) They are composed of different elements than the rest of the sun. D) They are regions nearly devoid of gas.