A disk rotates about an axis through its center. Point A is located on its rim and point B is located exactly one fourth of the way from the center toward the rim. What is the ratio of the angular velocity ?A to that of ?B, and the tangential velocity vA to that of vB? HINT (a) the angular velocity ?A to that of ?B ?A ?B =  (b) the tangential velocity vA to that of vB vA vB =

An 8.79cm diameter floppy disk rotates at its fastest at 470 rpm.  Part A: Express the angular velocity of the disk in revolutions per seconds?  Part B: What is the time period of this revolution? Use scientific notation for your answer.  Part C: What is the linear velocity of a point at the rim of the disk? Part D: What is the angular velocity at the center of the disk?  Part E: If the disk took 3.2 sec to spin up to 470 rpm from rest, what was the average angular acceleration? How many revolutions did the disk complete within this time? What is the net displacement?  Part F: If you turn off the floppy disk drive and the disk comes to a stop in 6.7 s, what is the average angular acceleration for this period of motion?

include FBD. thanks!

A thin disk rotates about an axis that goes through its center perpendicular to its plane. The disk is rotating counter- clockwise and slowing down. What can be said about the angular speed and acceleration of the disk? O Angular speed is positive, angular acceleration is positive O Angular speed is negative, angular acceleration is positive O Angular speed is negative, angular acceleration is negative O Angular speed is positive, angular acceleration is negative

A tire (R = 0.5 m) starts from rest and accelerates at 40 m/s? for 8 s. a) What is the total angular displacement? b) What is the velocity of the tire at 8 seconds? c) What is the angular acceleration?

A blade with a 0.25 m radius starts from rest and rotates with an accleration of 0.25 rad/s2. what is its angular velocity after 10s?

If the magnitudes of the velocity and acceleration of point A of the rotating bar are VA - 3 m/s and aA = 27 m/s2, what is the magnitude of the angular velocity co?a=0.58 m, b=0.14 m, and c=0.81 m. B b 0), a

F12–33. The car has a speed of 55 ft/s. Determine the angular velocity ô0 of the radial line OA at this instant. A r = 400 ft Prob. F12–33

An ultracentrifuge accelerates from rest to 9.91 × 10° rpm in 1.75 min. What is its angular acceleration in radians per second squared? angular acceleration: 978 rad/s? What is the tangential acceleration of a point 9.30 cm from the axis of rotation? tangential acceleration: 90.9 m/s? What is the radial acceleration in meters per second squared and in multiples of g of this point at full revolutions per minute? radial acceleration: 1.002 x10° m/s? radial acceleration in multiples of g: