A student swings a 0.35 kg rock on a 1.25 m string above their head. The rock goes through 1 complete revolution in 0.665 s. What is the tension in the string?

39.0 N

Explanation:

Since the rock is in uniform circular motion, the tension in the string provides the centripetal force required to keep the rock in circular motion.

So we can write:

where

T is the tension in the string

m = 0.35 kg is the mass of the rock

r = 1.25 m is the radius of the circle (the length of the string)

is the angular velocity of the rock

Here the rock covers 1 revolution in a time of

t = 0.665 s

1 revolution corresponds to an angle of rad, so the angular velocity is:

Therefore substituting into the previous equation, we can find the centripetal force, which is the tension in the string:

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach