College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- You have a grindstone (a disk) that is 77.0 kg, has a 0.400-m radius, and is turning at 89.0 rpm, and you press a steel axe against it with a radial force of 16.0 N. (a)Assuming the kinetic coefficient of friction between steel and stone is 0.50, calculate the angular acceleration (in rad/s2) of the grindstone. (Indicate the direction with the sign of your answer.) rad/s2 (b)How many turns (in rev) will the stone make before coming to rest? revarrow_forwardA point mass of O.37 kg is set to rotate about a fixed axis 0.74 m away. The mass is initially at rest and undergoes a constant angular acceleration of 5.57 rad/s². At what time will the centripetal force acting on the mass be 55.4 N?arrow_forwardA centrifuge in a medical laboratory rotates at an angular velocity of 3600 rev/min. When switched off, it rotates through 50.0 complete before coming to rest. what was the magnitude of the angular acceleratiom of the centrifuge as it slow down?arrow_forward
- A cyclist starts from rest and pedals such that the wheels of his bike have a constant angular acceleration.After 18 s, the wheels have made 76 rev. What is the angular velocity of the wheels after 18 s in rad/s ? What is the angular acceleration of the wheels in rad/s2 ?If the radius of the wheel is 32 cm, and the wheel rolls without slipping, how far has the cyclist (in m) traveled in 18 s?arrow_forwardAn ultracentrifuge accelerates from rest to 100,000 rpm in 2.30 min. (a) What is its angular acceleration in rad/s2? _________rad/s2 (b) What is the tangential acceleration of a point 10.7 cm from the axis of rotation?_________m/s2 (d) Express this radial acceleration as a multiple of g._________garrow_forwardYou spin a globe at 2.5 rad/s and then give it a push to speed it up to 3.0 rad/s. If it takes 0.20s to change the speed of the globe, what is the angular acceleration?arrow_forward
- A basketball spinning on someone’s finger undergoes an angular acceleration of -0.15 rad/s and is traveling at 27 rad/s initially. How many revolutions will it make before coming to a stop?arrow_forwardWhat is the magnitude of the tangential acceleration of a bug on the rim of a 13.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 76.0 rev/min in 5.00 s? One second after the bug starts from rest, what is the magnitude of its tangential acceleration? One second after the bug starts from rest, what is the magnitude of its centripetal acceleration?arrow_forwardHelp me please! A person rides a Ferris wheel that turns with constant angular velocity. Her weight is 544.0 N. At the top of the ride her apparent weight is 1.500 N different from her true weight. a) what is her apparent weight at the top of the ride? b) what is her apparent weight at the bottom of the ride? c) if the angular speed of the Ferris wheel is 0.0250 rad/s, what is its radius?arrow_forward
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