A uniform disk of mass 381 kg and radius 0.18 m is mounted on frictionless bearings so it can rotate freely around a vertical axis through its center (see the following figure). A cord is wrapped around he rim of the disk and pulled with a force of 10 N. 10 N (a) How much work (in J) has the force done at the instant the disk has completed two revolutions, starting from rest? (b) Determine the torque due to the force. (Enter the magnitude in N. m.) N.m Calculate the work (in J) done by this torque at the instant the disk has completed two revolutions. (c) What is the angular velocity (in rad/s) at that instant? (Enter the magnitude.) rad/s

A uniform disk of mass 381 kg and radius 0.18 m is mounted on frictionless bearings so it can rotate freely around a vertical axis through its center (see the following figure). A cord is wrapped around he rim of the disk and pulled with a force of 10 N. 10 N (a) How much work (in J) has the force done at the instant the disk has completed two revolutions, starting from rest? (b) Determine the torque due to the force. (Enter the magnitude in N. m.) N.m Calculate the work (in J) done by this torque at the instant the disk has completed two revolutions. (c) What is the angular velocity (in rad/s) at that instant? (Enter the magnitude.) rad/s

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

A horizontal 810-N merry-go-round of radius 1.70 m is started from rest by a constant horizontal force of 45 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 4.0 s. (Assume it is a solid cylinder. Also assume the force is applied at the outside edge.) Need Help? Read It
I only want part (d) to be solved
A merry-go-round rotates at the rate of 0.25 rev/s with an 75-kg man standing at a point 2.0 m from the axis of rotation. (a) What is the new angular speed when the man walks to a point 1.0 m from the center? Assume that the merry- go-round is a solid 25-kg cylinder of radius 2.0 m. rad/sec (b) Calculate the change in kinetic energy due to this movement. How do you account for this change in kinetic energy? O Wind resistance varies as the square of the speed. O Work is done by the merry-go-round on the man as he moves towards the center. O The moment arm of the man about the axis of rotation decreases. O Work is done by the man on the system as he moves towards the center.
A point on the rim of a 0.30 m radius rotating wheel has a tangential speed of 5.0 m/s. What is the tangential speed of a point 0.20 m from the center of the same wheel?
(a) Without the wheels, a bicycle frame has a mass of 8.19 kg. Each of the wheels can be roughly modeled as a uniform solid disk with a mass of 0.820 kg and a radius of 0.343 m. Find the kinetic energy of the whole bicycle when it is moving forward at 2.90 m/s. 37.88 Your response differs from the correct answer by more than 10%. Double check your calculations. J (b) Before the invention of a wheel turning on an axle, ancient people moved heavy loads by placing rollers under them. (Modern people use rollers, too. Any hardware store will sell you a roller bearing for a lazy susan.) A stone block of mass 819 kg moves forward at 0.290 m/s, supported by two uniform cylindrical tree trunks, each of mass 82.0 kg and radius 0.343 m. No slipping occurs between the block and the rollers or between the rollers and the ground. Find the total kinetic energy of the moving objects.
A 270-g mass hangs from a string that is wrapped around a pulley, as shown in the figure. The pulley is suspended in such a way that it can rotate freely. When the mass is released, it accelerates toward the floor as the string unwinds. Model the pulley as a uniform solid cylinder of mass 1.00 kg and radius 5.00 cm. Assume that the thread has negligible mass and does not slip or stretch as it unwinds. Determine the magnitude a of the pulley's angular acceleration. 344 rad/s? Incorrect Determine the magnitude of the acceleration a of the descending weight. a = m/s? Question Source: Freedman College Physics 3e | Publ
Suppose a 165 kg motorcycle has two wheels and is heading toward a hill at a speed of 30.0 m/s. Assume the wheels to be approximately an annular ring with an inner radius of R1 = 0.280 m and an outer radius of R2 = 0.500 m. The mass of each wheel is 12.3 kg. (a) How high can it coast up the hill in meters, if you neglect friction? (Give your answer to at least 1 decimal place.) m (b) How much energy, in joules, is lost to friction if the motorcycle only gains an altitude of 35.0 m before coming to rest? J
A solid sphere of weight 54.0 N rolls up an incline at an angle of 33.0°. At the bottom of the incline the center of mass of the sphere has a translational speed of 7.70 m/s. (a) What is the kinetic energy of the sphere at the bottom of the incline? (b) How far does the sphere travel up along the incline? (c) Does the answer to (b) depend on the sphere's mass? (a) Number i (b) Number (c) Mi Units Units
I need help with this problem please
A disk of radius = 2.02 mm is attached to a high-speed drill at a dentist’s office and is turning at 96,185 rad/sec. Determine the tangential speed of a point on the outer edge of this disk. Use g=9.8
A 250-g mass hangs from a string that is wrapped around a pulley, as shown in the figure. The pulley is suspended in such a way that it can rotate freely. When the mass is released, it accelerates toward the floor as the string unwinds. Model the pulley as a uniform solid cylinder of mass 1.00 kg and radius 5.00 cm. Assume that the thread has negligible mass and does not slip or stretch as it unwinds. Determine the magnitude a of the pulley's angular acceleration. rad/s? a = Determine the magnitude of the acceleration a of the descending weight. m/s? a = Calculate the magnitude of the tension T in the string. T = N Ouestien Source: Ereedman Cellege Dhycics 20 Dublich er: Mac mill
A 600-g solid sphere has a diameter of 10cm rotates at 600 revolution pero minute about an axis through its center. Determine the kinetic energy of the system.