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Physics: A child sits on a rotating merry-go-round

A child sits on a rotating merry-go-round, 2.1 meters from its center. If the speed of the child is 1.0 m/s, what is the minimum coefficient of static friction between the child and the merry go round that will prevent the child from slipping.

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The centripetal force that is acting on the child is given by the equation:

F = m*(v^2)/r

m is the mass of the child (unknown)
v is the velocity of the child (1.0 m/s)
r is the distance of the child from the center of rotation (the radius, 2.1 m)

The force of friction is given by the equation:

F = mu*N

mu is the ...

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