Why are three of saturn's satellites -- atlas, prometheus and pandora -- called
"shepherd moons"?
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a. they speed up saturn's rotation.
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b. they create rings around saturn.
c. they cause intense winds on saturn's surface.
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d. they keep saturn's rings in order.
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Atlas, Prometheus, and Pandora are three belong from Saturn's satellites and also called as "shepherd moons". Because they keep the saturn's ring in order.

Option D

Explanation:

Saturn has a lot of shepherd moons. They are called so because they pay attention to the material that trying to return to its place from the ring. Also, these play a responsible role in the rings for the gaps.

Prometheus and Pandora are racing near ring F. Prometheus are referred to as a “shepherd” on the F ring's outer edge and Pandora on the inner F ring’s edge. The Atlas should be a shepherd for ring A’s outer edge.

They work with Saturn's rings to ensure that it does not diverge on their current trajectory. So, these refer to the shepherd which ensures their herd does not leave from the selected course.

technology is the application of the knowledge gained by science.

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft