4.) A DVD drive rotates a DVD at 1000 revolutions per minute (rpm). a) What is the angular velocity in revolutions per second? b) What is the angular velocity in radians per second? c) If the radius of the DVD is 0.05 m, at what linear speed (m/s) is a point at the edge of the DVD moving?

4.) A DVD drive rotates a DVD at 1000 revolutions per minute (rpm). a) What is the angular velocity in revolutions per second? b) What is the angular velocity in radians per second? c) If the radius of the DVD is 0.05 m, at what linear speed (m/s) is a point at the edge of the DVD moving?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter6: Uniform Circular Motion And Gravitation

Section: Chapter Questions

Problem 7PE: A truck with 0.420-m-radius tires travels at 32.0 m/s. What is the angular velocity of the rotating...

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One method of pitching a softball is called the wind-mill delivery method, in which the pitchers arm rotates through approximately 360 in a vertical plane before the 198-gram ball is released at the lowest point of the circular motion. An experienced pitcher can throw a ball with a speed of 98.0 mi/h. Assume the angular acceleration is uniform throughout the pitching motion and take the distance between the softball and the shoulder joint to be 74.2 cm. (a) Determine the angular speed of the arm in rev/s at the instant of release, (b) Find the value of the angular acceleration in rev/s2 and the radial and tangential acceleration of the ball just before it is released, (c) Determine the force exerted on the ball by the pitchers hand (both radial and tangential components) just before it is released.
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The propeller of a World War Il fighter plane is 2.30 m in diameter. (a) What is its angular velocity in radians per second if it spins at 1200 rev/min? (b) What is the linear speed of its tip at this angular velocity if the plane is stationary on the tarmac? (c) What is the centripetal acceleration of the propeller tip under these conditions? Calculate it in meters per second squared and convert to multiples of g.
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