College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A wheel, starting from rest, rotates with a constant
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- You have a 1.00 m long string with a bob attached to its end. You are swinging it around your head, and it completes 1.00 whole revolution every 2.00 s. What is its tangential speed, in m/s? Answer with 3 significant figures.arrow_forwardThe ability of the human eye to rapidly rotate was studied using contact lenses fitted with accelerometers. While a subject, whose eyeball has radius 1.25 cm, watches a moving object her eyeball rotates through 20.0° in a time interval of 69.6 ms. a. What is the magnitude of the average angular velocity of the eye? asnwer in rad/s b. Assume that the eye starts at rest, rotates with a constant angular acceleration during the first half of the interval, and then the rotation slows with a constant angular acceleration during the second half until it comes to rest. What is the magnitude of the angular acceleration of the eye? answer in rad/s^2 c. What tangential acceleration would the contact-lens accelerometers record in this case? answer in m/s^2arrow_forwardThe end of the cutting cord on a gas-powered weed cutter is 0.21 m in length. If the motor starts from rest and accelerates with an angular acceleration of 52 rad/s² for 1.82 s then continues with uniform angular velocity. What is the rpm of the cutting cord after the 1.82 s?arrow_forward
- A disk of radius 2.25 m rotates about its axis. Points on the rim of the disk undergo tangential acceleration of magnitude 1.81 m/s?. At a particular time, the rim has a tangential speed of 1.67 m/s. At a time 0.867 s later, what is the tangential speed v of a point on the rim, the magnitude of the point's radial acceleration a,, and the magnitude of its total acceleration Arot? U = m/s ar = m/s? Atot = m/s?arrow_forwardA automobile tire starts to rotates from rest with a constant anqular acceleration of 2 rad/s2 . How many revolutions it makes in 4 seconds ?arrow_forwardAn engine flywheel initially rotates counterclockwise at 6.83 rotations/s. Then, during 25.1 s, its rotation rate changes to 2.19 rotations/s clockwise. Find the flywheel's average angular acceleration (including its sign) in radians per second squared. Define counterclockwise rotation as positive. what is the average angular acceleration?arrow_forward
- A flywheel is rotating at 36.5 rev/s.What is the total angle, in radians, through which a point on the flywheel rotates in 29.7 s?arrow_forwardThe center O of the wheel is mounted on the sliding block, which has an acceleration ao = 7.1 m/s² to the right. At the instant when 0 = 39°, 0 = 3.3 rad/s and 0 = -6.7 rad/s². For this instant determine the magnitudes of the accelerations of points A and B. 8 Answers: aA = ав A i i 340. mm B ao m/s² m/s²arrow_forwardIf a centrifuge has an inital angular velocity of 20 rotations per second and and a constant angular acceleration of 15 rad/s2 how fast is it rotating after 25 rotations in rotations per second.arrow_forward
- A centrifuge accelerates uniformly from rest to 13000 rpm in 180 s. A. Through how many revolutions did it turn in this time?arrow_forwardAn automobile with 0.300 m radius tires travels 70,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear? x revolutions A truck with O.600 m radius tires travels at 29.0 m/s. At how many radians per second are the tires rotating? What is this in rpm? гad/s rpmarrow_forwardA merry-go-round rotates from rest with an angular acceleration of 1.36 rad/s2. How long does it take to rotate through (a) the first 1.74 rev and (b) the next 1.74 rev?arrow_forward
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