College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Two ladybugs are riding on a turntable as it rotates at 15 rpm as shown in (Figure 1).
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- Consider two points A and B on a rotating disk as shown. Which point has a larger angular velocity? a.) Object A b.) Cannot be determined with the information given. c.) Object B d.) They have the same angular velocity.arrow_forwardThe figure below shows, at left, a solid flywheel of radius R = 0.550 m and mass 60.0 kg. Tu Mounted directly to it and coaxial with it is a pulley with a much smaller mass and a radius of r = 0.230 m. The flywheel and pulley assembly are on a frictionless axle. A belt is wrapped around the pulley and connected to an electric motor as shown on the right. The turning motor gives the flywheel and pulley a clockwise angular acceleration of 1.67 rad/s2. The tension T, in the upper (taut) segment of the belt is 155 N. (a) What is the tension (in N) in the lower (slack) segment of the belt? N (b) What If? You replace the belt with a different one (one slightly longer and looser, but still tight enough that it does not sag). You again turn on the motor so that the flywheel accelerates clockwise. The upper segment of the belt once again has a tension of 155 N, but now the tension in the lower belt is exactly zero. What is the magnitude of the angular acceleration (in rad/s2)? rad/s2arrow_forwardNeeds Complete typed solution with 100 % accuracy.arrow_forward
- Two gears are connected to each other, their radius is 0.15m and 0.5m. Calculate the revolutions that the small gear completes when the big gear completes 3 revolutionsarrow_forwardIf a wheel turns 3,500 revolutions (angular displacement), calculate its angular displacement in: a.) Radians b.) Degreesarrow_forwardA clay ball hits a rod and sticks to it after the collision. What is the rod's linear speed? A clay ball hits a rod and sticks to it after the collision. What is the rod's angular speed?arrow_forward
- A wheel that is initially at rest has forces applied to it, as shown in (Figure 1), and it begins to rotationally accelerate. Calculate the net torque about the axle of the wheel shown in (Figure 1). Assume that a friction torque of 0.45 m⋅N opposes the motion.arrow_forwardThe rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left), or a distance r/2 from the axis of rotation (right). If you release the hanging blocks simultaneously from rest, O A. the block at the right lands first. O B. both blocks land at the same time. O C. the block to the left lands first.arrow_forwardYou stand on a turn-table with arms extended out horizontally, as shown in the figure below. In each hand, she holds an 8 kg weight. In this initial state, your professor and the turn-table are rotating at a constant rate of 9 rpm. Note that each weight is held 85 cm from the axis of rotation. Your professor brings her arms, and the weights, inwards towards her axis of rotation, as shown in the figure. What is the final rotational speed, in rpm, of your professor on the turn- table? You can assume that the weights are located on the axis of rotation in this final state. Wi Wt inital rinal State stüte The turn-table has a moment of inertia of 0.31 kg m^2. Your mated as a solid cylinder of uniform density with a mass of 65 kg and a radius of 16 cm. You can neglect the mass of the arms. assume that the weights can be approximated as point masses. body can be approxi-arrow_forward
- What is the period of a disk that travels at a speed of 375 rpm?arrow_forwardHi, can you please help me answer the question attatched below with an explanation? thank youarrow_forwardUse the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M = 8.50 x 10¹ kg and radius R = 2.30 m is rotating in a horizontal plane about a frictionless vertical axle (see figure). (a) After a student with mass m = 80.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 2.10 rad/s. If the student walks slowly from the edge toward the center, find the angular speed of the system when she reaches a point 0.490 m from the center. Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. rad/s (b) Find the change in the system's rotational kinetic energy caused by her movement to the center. X Your response differs from the correct answer by more than 10%. Double check your calculations. J (c) Find the work done on the student as she or= 0.490 m.arrow_forward
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