### Estimate the stiffness of the spring

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Q1. A box slides down a 35° ramp with an acceleration of 1.00 m/s2. Establish the coefficient of kinetic friction between box and ramp.

Q2. Estimate the stiffness of the spring in a child's pogo stick if the child has a mass of 39kg and bounces once every 2.3 seconds.

Q3. What centripetal force does an 80-kg passenger experience when seated 12 m from the center of the Ferris wheel whose angular speed is 0.50 rad/s?

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