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A person with mass mp = 72 kg stands on a spinning platform disk with a radius of R = 1.74 m and mass md = 195 kg. The disk is initially spinning at w = 1.9 rad/s. The person then walks 2/3 of the way toward the center of the disk (ending 0.58 m from the center).
What is the change in the total kinetic energy of the person and disk? (A positive value means the energy increased.)
What is the centripetal acceleration of the person when she is at R/3?
If the person now walks back to the rim of the disk, what is the final angular speed of the disk?
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Objects with masses of 145kg and a 445kg are separated by 0.330m. At what position (other than infinitely remote ones) can the 32kg object be placed so as to experience the net force of zero.
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The intersection is 15 m wide. Her car's maximum deceleration is -6.8m/s2, whereas it can accelerate from 43km/h to 70km/h in 8.1 s. Overlook length of her car and her reaction time.
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