At time t= 0s, a wheel has an angular displacement of zero radians and an angular velocity of 29 radja The wheel has a constant acceleration of -0.52 radjs?. In this situation, the maximum value of the angular displacement, in rad, is closest to: OA. +1011 O B. +1617 OC. +1213 O D.+1415 O E. +809

At time t= 0s, a wheel has an angular displacement of zero radians and an angular velocity of 29 radja The wheel has a constant acceleration of -0.52 radjs?. In this situation, the maximum value of the angular displacement, in rad, is closest to: OA. +1011 O B. +1617 OC. +1213 O D.+1415 O E. +809

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter10: Rotational Motion And Angular Momentum

Section: Chapter Questions

Problem 2PE: Integrated Concepts An ultracentrifuge accelerates from rest to 100,000 rpm in 2.00 min. (a) What is...

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Integrated Concepts An ultracentrifuge accelerates from rest to 100,000 rpm in 2.00 min. (a) What is its angular acceleration in rad/s2? (b) What is the tangential acceleration of a point 9.50 cm from the axis of rotation? (c) What is the radial acceleration in m/s2 and multiples of g of this point at full rpm?
A shaft is turning at 65.0 rad/s at time t = 0. Thereafter, its angular acceleration is given by =10.05.00t where is in rad/s2 and t is in seconds. (a) Find the angular speed of the shaft at t = 3.00 s. (b) Through what angle does it turn between t = 0 and t = 3.00 s?
Keratinocytes are the most common cells in the skins outer layer. As these approximately circular cells migrate across a wound during the healing process, they roll in a way that reduces the frictional forces impeding their motion. (a) Given a cell body diameter of 1.00 105 m (10 m), what minimum angular speed would be required to produce the observed linear speed of 1.67 107 m/s (10 m/min)? (b) How many complete revolutions would be required for the cell to roll a distance of 5.00 103 m? (Because of slipping as the cells roll, averages of observed angular speeds and the number of complete revolutions are about three times these minimum values.)
Human centrifuges are used to train military pilots and astronauts in preparation for high-g maneuvers. A trained, fit person wearing a g-suit can withstand accelerations up to about 9g (88.2 m/s2) without losing consciousness, (a) If a human centrifuge has a radius of 4.50 m, what angular speed results in a centripetal acceleration of 9g? (b) What linear speed would a person in the centrifuge have at this acceleration?
A wind turbine is rotating conterclockwise at 0.5 rev/s and slows to a stop in 10 s. Its blades are 20 m in length. (a) What is the angular acceleration of the turbine? (b) What is the centripetal acceleration of the tip fo the blades at t=0s ? (c) What is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s ?
An automobile with 0.260 m radius tires travels 80,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?
A shaft is turning at angular speed at time t = 0. Thereafter, its angular acceleration is given by =A=Bt (a) Find the angular speed of the shaft at time t. (b) Through what angle does it turn between t = 0 and t?
A truck with 0.420-m-radius tires travels at 32.0 m/s. What is the angular velocity of the rotating tires in radians per second? What is this in rev/min?
Olympic ice skaters are able to spin at about 5 rev/s. (a) What is their angular velocity in radians per second? (b) What is the centripetal acceleration of the skater's nose if it is 0.120 m from the axis of rotation? (c) An exceptional skater named Dick Button was able to spin much faster in the 1950s than anyone since—at about 9 rev/s. What was the centripetal acceleration of the tip of his nose, assuming it is at 0.120 m radius? (d) Comment on the magnitudes of the accelerations found. It is reputed that Button ruptured small blood vessels during his spins.
A cylinder is turning at 1200 revolutions per minute (1200 rpm).Express this angular speed in radians per second (rad/s). a. 2.1 rad/s b. 19 rad/s c. 126 rad/s С. d. 39 rad/s e. 0.67 rad/s
PAGE 232 HOMEWORK CHAPTER 9 1. A compact disk rotates clockwise, making one revolution in 0.286 s. a) Find the angular velocity, o. b) Find the linear speed, v, of a point 6.00 cm = 0.0600 m from the axis of rotation. Ans. a. 22.0 rad/s b. 1.32 m/s
A rotating disk is initially spinning at w 7.4 rev/s, slows down and stops in 11.6 s. What is the magnitude of the disk's average angular acceleration? (in rev/s^2) 1.28 .a O 42.92 .b O 0.64.c O 0.64-.d O