Question

An aluminum disk with radius 8.00 cm and weighing 160.0 g is rotating at a rate...

An aluminum disk with radius 8.00 cm and weighing 160.0 g is rotating at a rate of 24.0 rpm about an axis passing through its center and perpendicular to the disk. A metal ring weighing 620.g (inner diameter 4.80 cm and outer diameter 6.40 cm) is gently placed on top of the disk with its center matching with the center of the disk. What will be the resulting speed of rotation?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Use the equation for moment of inertia of disc and annular ring and the conservation of angular momentum principle to find the required angular speed as shown below

***********************************************************************************************
This concludes the answers. If there is any mistake or omission, let me know immediately and I will fix it....

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A compound disk of outside diameter 144 cm is made up of a uniform solid disk...
A compound disk of outside diameter 144 cm is made up of a uniform solid disk of radius 36.0 cm and area density 5.00 g/cm2 surrounded by a concentric ring of inner radius 36.0 cm , outer radius 72.0 cm , and area density 2.30 g/cm2 . Find the moment of inertia of this object about an axis perpendicular to the plane of the object and passing through its center.
A compound disk of outside diameter 130 cm is made up of a uniform solid disk...
A compound disk of outside diameter 130 cm is made up of a uniform solid disk of radius 35.0 cm and area density 5.10 g/cm2 surrounded by a concentric ring of inner radius 35.0 cm , outer radius 65.0 cm , and area density 2.30 g/cm2 . A)Find the moment of inertia of this object about an axis perpendicular to the plane of the object and passing through its center.
A compound disk of outside diameter 160 cm is made up of a uniform solid disk...
A compound disk of outside diameter 160 cm is made up of a uniform solid disk of radius 32.0 cm and area density 4.70 g/cm2 surrounded by a concentric ring of inner radius 32.0 cm , outer radius 80.0 cm , and area density 1.80 g/cm2 . Find the moment of inertia of this object about an axis perpendicular to the plane of the object and passing through its center. Please make sure for the answer to be correct and...
A flying disk (180 g, 30.0 cm in diameter) spins at a rate of 340 rpm...
A flying disk (180 g, 30.0 cm in diameter) spins at a rate of 340 rpm with its center balanced on a fingertip. What is the rotational kinetic energy of the Frisbee if the disc has 70% of its mass on the outer edge (basically a thin ring 30.0-cm in diameter) and the remaining 30% is a nearly flat disk 30.0-cm in diameter? 1) What is the rotational kinetic energy of the Frisbee
A flying disk (150 g, 25.0 cm in diameter) spins at a rate of 290 rpm...
A flying disk (150 g, 25.0 cm in diameter) spins at a rate of 290 rpm with its center balanced on a fingertip. What is the rotational kinetic energy of the Frisbee if the disc has 70% of its mass on the outer edge (basically a thin ring 25.0-cm in diameter) and the remaining 30% is a nearly flat disk 25.0-cm in diameter? 1)What is the rotational kinetic energy of the Frisbee? (Express your answer to two significant figures.)
Consider an aluminum annular disk with an outer radius 63.2 mm and inner radius 7.9 mm....
Consider an aluminum annular disk with an outer radius 63.2 mm and inner radius 7.9 mm. The mass of the disk is 464 grams. The disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small pulley rigidly mounted at the top concentrically. The pulley's radius is 12.1 mm, and the mass of the pulley is negligible. A string is wrapped around the pulley, and a hanging mass of 19.3...
A 15 g circular annulus of outer radius 42.3 cm and inner radius 29.7 cm makes...
A 15 g circular annulus of outer radius 42.3 cm and inner radius 29.7 cm makes small oscillations on an axle through its outer edge perpendicular to its face. (a) Find its frequency of oscillation. (b) Find the frequency of oscillation of a thin ring of the same outer radius and mass. (c) Find the frequency of oscillation of a solid disc of the same outer radius, thickness, and density.
A 200 g , 22-cm-diameter plastic disk is spun on an axle through its center by...
A 200 g , 22-cm-diameter plastic disk is spun on an axle through its center by an electric motor.What torque must the motor supply to take the disk from 0 to 1700 rpm in 4.8 s ?
A 250 g , 23-cm-diameter plastic disk is spun on an axle through its center by...
A 250 g , 23-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1900 rpm in 4.3 s ?
Moment of Inertia To find the moment of inertia of different objects and to observe the...
Moment of Inertia To find the moment of inertia of different objects and to observe the changes in angular acceleration relative to changing moments of inertia. To also learn how to use calipers in making precise measurements The momentum of inertia of an object is calculated as I=∑mr^2 If the object in question rotates around a central point, then it can be considered a "point mass", and its moment of inertia is simply,  I=mr^2 where r is from the central point...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT