A compact disk of diameter 14 cm starts from rest and speeds up uniformly to 2 rev/s in 3.0 seconds. What is the tangential acceleration of a point on the outer rim of the disk moving at 3 rev/s
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A compact disk of diameter 14 cm starts from rest and speeds up uniformly to 2 rev/s in 3.0 seconds. What is the tangential acceleration of a point on the outer rim of the disk moving at 3 rev/s?

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- The tires of a car make 85.0. revolutions as the car reduces its speed uniformly from 90.0 km/hr to 60.0 km/hr. The tires have a diameter of 0.90 m. What is the angular acceleration? If the car continues to slow down at this rate, how much more time is required to stop?(a) What is the magnitude of the tangential acceleration of a bug on the rim of a 13.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 80.0 rev/min in 3.70 s? m/s2(b) When the disk is at its final speed, what is the magnitude of the tangential velocity of the bug? m/s(c) One second after the bug starts from rest, what is the magnitude of its tangential acceleration? m/s2(d) One second after the bug starts from rest, what is the magnitude of its centripetal acceleration? m/s2(e) One second after the bug starts from rest, what is its total acceleration? (Take the positive direction to be in the direction of motion.) magnitude m/s2 direction ° from the radially inward directionA child of mass 40 kg stands beside a circular platform of mass 115 kg and radius 1.6 m spinning at 3.4 rad/s. Treat the platform as a disk. The child steps on the rim. What is the new angular speed? in rad/s She then walks to the center and stay there. What is the angular velocity of the platform then? in rad/s What is the change in kinetic energy when she walks from the rim to the center of the platform? in J
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