College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A barbell consists of two small balls, each with mass m at the ends of a very low mass rod of length d. The barbell is mounted on the end of a low-mass rigid rod of length b. This apparatus is started in such a way that while the rod rotates clockwise with angular speed ω1, the barbell rotates clockwise about its center with an angular speed ω2.arrow_forwardThe member shown below is fixed at O and its dimensions are h1 = 1.10 m, h2= 0.20 m, and w = 0.50 m A force F of magnitude F=40 N is applied at point A. Determine the magnitude of the moment of the force about point O.arrow_forwardA rotating door is made from four rectangular glass panes, as shown in the figure. The mass of each pane is 94.8 kg. A person pushes on the outer edge of one pane with a force of F = 71.7 N that is directed perpendicular to the pane. Determine the magnitude of the door's angular acceleration. 1.2 m 1.2 m Number i Unitsarrow_forward
- 4. 00 10 cm MA = 100 g m² = 100 g mc = 200 g mp = 200 g The four masses are connected by massless rigid sticks. a.) Locate the center of mass. b.) The object rotates about an axis that passes through the center of mass and is parallel to the z-axis. The constant angular velocity is w = 8 rad/s. Calculate the total kinetic energy of this system.arrow_forwardbox the final answersarrow_forwardA = 3 B= 9 C= 6 D = 8arrow_forward
- A bicycle is rolling down a circular hill that has a radius of 7.49 m. As the figure illustrates, the angular displacement of the bicycle is 0.960 rad. The radius of each wheel is 0.449 m. What is the angle (in radians) through which each tire rotates? Number i Units radarrow_forwardÏ A disc (thin cylinder) of mass 0.29 kg and radius 0.75 m is rotating on a frictionless axle at a constant rate of 82 RPM. What is the moment of inertia for this disc? kg.m² A second disc of 0.14 kg and 0.41 m is dropped down the axle on top. The two then rotate together. What is the final moment of inertia for both discs together? kg/m² |=| |=arrow_forwardA system of point particles is shown in the following figure. Each particle has mass 0.43 kg, and they all lie in the same plane. 62 cm 49 cm axis 29 cm (a) What is the moment of inertia (in kg. m²) of the system about the given axis? kg-m² (b) If the system rotates at 5.6 rev/s, what is its rotational kinetic energy (in J)? Jarrow_forward
- A disk has mass M = 1.0 kg and radius, R = 0.3 m is free to rotate about a fixed axle through its center. Since the axle is fixed, the center of mass of the disk does not move. The disk is initially not rotating. A student wraps a string 5 times around the perimeter of the disk and then pulls the string with a constant force of F = 2.0 N, as shown in the figure below. F= 2N E R=0.3m I=įmr? The student pulls on the string until it is completely unwound, and the string does not slip on the disk as it is pulled. After the string has unwound, what is the angular speed of the disk w : OA. W = 54.9 radians/sec OB. W = 32.8 radians/sec OC. 29 radians/sec O D w = 17.6 radians/sec 6.3 radians/secarrow_forward2. A weightless rod of length 2L carries two equal masses m at its ends and forms angle 8 with the vertical z axis. The rod rotates with angular velocity w about the z axis. A) Find the Lz component and the Lz vector of the angular momentum of the system. B) It is logical that the vector LZ is not the angular momentum of the system parallel to the z-axis? For what angle 8 is L parallel to z axis?arrow_forwardFour objects-a hoop, a solid cylinder, a solid sphere, and a thin, spherical shell-each have a mass of 4.33 kg and a radius of 0.264 m. (a) Find the moment of inertia for each object as it rotates about the axes shown in the table below. Moments of Inertia for Various Rigid Objects of Uniform Composition Hoop or thin cylindrical shell 1 = MR² Solid sphere Solid cylinder or disk Thin spherical shell MR Long, thin rod with rotation axis Long, thin rod with rotation axis through center ML? through end hoop kg · m2 solid cylinder kg · m2 solid sphere kg · m2 thin, spherical shell kg · m2arrow_forward
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