Centripetal force is the force that maintains an object in a circular motion. This is an external force that acts on the object in the direction of the centre of the circular motion, namely tension of the string in this case.
Centripetal force may be calculated using the formula:
F = mv²/r
m=mass (kg)
v=tangential velocity (m/s)
r=radius (m)
A person is flying a model airplane with mass 82.2 gram in a horizontal circular path on the
end of a string 10.5 m long. The string is horizontal and exerts a force of 3.22 N on the hand
of the person holding it. What is the speed (in m/s) of the plane?
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