A horizontal 810-N merry-go-round of radius 1.70 m is started from rest by a constant horizontal force of 45 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 4.0 s.
(Assume it is a solid cylinder. Also assume the force is applied at the outside edge.)
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centripetal force =( m* v^2 )/r
F*r = m* v^2
kinetic energy = 1/2 * m*v ^2
kinetic energy = 1/2 *F*r
kinetic energy = 1/2 *45*1.70
kinetic energy = 38.25
after 4 seconds
kinetic energy = 153 J
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