A 20-G centrifuge at NASA is used to test the effects of very large accelerations or hypergravity on test pilots and astronauts. This centrifuge has an arm of 8.84 m long that rotates about one end in a horizontal plane, and the subject is strapped in at the other end. If the subject is aligned along the centrifuge’s arm with his head at the outermost end, and the maximum sustained acceleration to which humans are subjected in this device is typically 12.5g, (a) how fast must the subject’s head be moving to experience this maximum acceleration? (b) What is the difference between the acceleration of his head and feet if the subject is 1.57 m tall?

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.