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.

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s