The force of static friction keeps a stationary object at rest. Once the force of static friction is overcome, the force of kinetic friction is what slows down a moving object.
The new gravitational attraction will be 1/4 as much
Explanation:
The magnitude of the gravitational force between two objects is given by
where
is the gravitational constant
m1, m2 are the masses of the two objects
r is the separation between them
In this problem, the original force between the two objects is F, when they are separated by a distance r.
Later, the distance between the two objects is doubled, so the new distance is

Therefore, the new force will be

Therefore, the new force will be one-fourth as much.
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The answer is B - Current Y has a greater potential difference, and the charges flow at a slower rate.
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Answer:
Work = power * time
time = 20000 joules / 1000 joules / sec = 20 sec
Using the equation for period length, you get an answer of about 4.1 seconds.