Rotational Probs - 3 rad/s How long before they meet 6 A...

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PROBLEMS FOR ROTATIONAL MOTION 1. A diver completes 3 1/2 somersaults 11.7 s. What is the average angular speed of the diver? 2. A CD has a playing time of 74 minutes. When the music starts, the CD is rotating at angular speed of 480 revolutions per minute. At the end of the music, the CD is rotating at 210 rpm. What is the magnitude of the average angular velocity of the CD? 3. An electrical circular saw is designed to reach its final angular speed, starting from rest in 1.50 s. Its average angular acceleration is 328 rad/sec*sec . What is its final angular speed? 4. An electrical fan is running on HIGH. After the LOW button is pressed, the angular speed of the fan decreases to 83.8 rad/s in 17.5 s. The deceleration of the fan is 42 rad/s*s. What was the initial angular speed of the fan? 5. Two people start at the same place and walk around a circular path in opposite directions. One has an angular speed of 1.7 x 10 - 3 rad/s, while the other has an angular speed of 3.4 x 10 -
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Unformatted text preview: 3 rad/s. How long before they meet? 6. A fan blade starts from rest and makes 4 rotations about its center point that has a radius of0.25 m. It takes 10 seconds to reach its maximum speed before it reaches maximum cooling. a. What is the arc length of the fan blade? b. What is the angular velocity of the blade? c. What is the angular acceleration of the blade? 7.What is the center of gravity of an arm: Upper arm is 17 N and the center of upper arm is 0.13 from shoulder. Lower arm is 11 N and center of lower arm is 0.38 m from shoulder. Hand is 4.2 N and middle is 0.61 m from shoulder. 8. A dentist causes a the bit of a high speed- drill to accelerate from an angular speed of 1.05 x 10^4 rad/s to an angular speed of 3.14 x 10^4 rad/s. In the process the bit turns through 1.88 x10^4 rad. Assuming a constant acceleration how long would it take the bit to reach its maximum speed of 7.85 xa0^4 rad /s from rest?...
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