# Record And Turntable, Physics Help. I Need The Solved Equations, But Cannot Get Them Right For Some Reason.?

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## Record and turntable, Physics help. I need the solved equations, but cannot get them right for some reason.?

https://session.masteringphysics.com/problemAsset/…

Part A

What is the final angular velocity, ωf, of the two disks?

Express ωf in terms of It, Ir, and ωi.

Part B

Because of friction, rotational kinetic energy is not conserved while the disks’ surfaces slip over each other. What is the final rotational kinetic energy, Kf, of the two spinning disks?

Express the final kinetic energy in terms of It, Ir, and the initial kinetic energy Ki of the two-disk system. No angular velocities should appear in your answer.

Record and turntable, Physics help. I need the solved – What is the final angular velocity, ωf, of the two disks? Express ωf in terms of It, Ir, and ωi. Part B. Because of friction, rotational kinetic energy is not conserved while the disks' surfaces slip over each other. What is the final rotational kinetic energy, Kf, of the two spinning disks? Express the final kinetic energy in terms of ItThe initial angular velocity of the second disk is zero.There is friction between the two disks.After this "rotational collision," the disks will eventually rotate with the same angular velocity.Part AWhat is the final angular velocity, ωf, of the two disks?Express ωf (omega subscript f) in terms of It, Ir, and ωi (omega subscript i).Part BBecause of friction, rotational kinetic energy is not conserved while the disks' surfaces slip over each other.Assume that the turntable deccelerated during time before reaching the final angular velocity ( is the time interval between the moment when the top disk is dropped and the time that the disks begin to spin at the same angular velocity). What was the average torque, , acting on the bottom disk due to friction with the record?

To understand how to use conservation of a… | Clutch Prep – 11/24/14, 12:36 PM Angular momentum and gravitation Page 7 of 36 Use the relationship between and (from the answer to the first part of this problem) to express in terms of .Then use the equation relating and to express in terms of . ANSWER: Correct Some of the energy was converted into heat and sound as the frictional force, torque acted, stopping relative motion.We can solve for the final velocity using conservation of energy, but we must first express rotational quantities in terms of translational quantities to end up with v as the only unknown. Solution. Conservation of energy for this situation is written as described above: [latex]mgh=\frac{1}{2}{mv}^{2}+\frac{1}{2}{\mathrm{I\omega }}^{2}[/latex].Thus the final angular velocity is equal to one half its original value.

MasteringPhysics 2.0: Problem Print View – Angular velocity is defined as the rate of change of angular displacement which specifies the angular speed or rotational speed of an object and the axis about which the object is rotating. The formula for angular velocity and solved example.The moment of inertia of the record is Ir = 3.0e-4 kg.m2. The initial angular velocity of the second disk is zero. There is friction between the two disks. After this "rotational collision," the disks will eventually rotate with the same angular velocity.A wheel is turning about an axis through its center with constant angular acceleration. Starting from rest, at t=0t=0, the wheel turns through 8.75 revolutions in t=t= 13.0 ss . At 13.0 ss the kinetic energy of the wheel is 36.0 J Part A For an axis through its center, what is the moment of inertia of the wheel?