A disc (thin cylinder) of mass 0.05 kg and radius 0.65 m is rotating on a frictionless axle at a constant rate of 77 RPM. What a the angular velocity and angular momentum of the disc? W = rad/s L = kg-m2 A second disc of 0.02 kg and 0.23 m is dropped down the axle on top. The two then rotate together. What is the final angular velocity and RPM of the system of discs? rad/s RPM = RPM

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
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**Rotational Motion and Angular Momentum**

In this educational exercise, we explore the concepts of angular velocity and angular momentum through a practical example involving a rotating disc.

### Problem Statement

A disc (thin cylinder) with the following properties:
- Mass: 0.05 kg
- Radius: 0.65 m

This disc is rotating on a frictionless axle at a constant rate of 77 RPM (revolutions per minute). We are tasked with determining:
1. The angular velocity (\(\omega\)) in radians per second.
2. The angular momentum (L) in kg·m²/s.

**Formulas:**
- Angular Velocity, \(\omega = \frac{\text{RPM} \times 2\pi}{60}\)
- Angular Momentum, \(L = I \times \omega\)
  - Moment of Inertia for a disc, \(I = \frac{1}{2} m r^2\)

### Additional Scenario

A second disc with the following properties:
- Mass: 0.02 kg
- Radius: 0.23 m

This second disc is dropped onto the first disc, and they rotate together. We need to find:
1. The final angular velocity (\(\omega\)) of the system.
2. The final RPM of the system.

**Diagram Description:**

The diagram depicts:
- A vertical axle with a larger disc at the bottom rotating in a horizontal plane.
- A smaller disc above, aligned to be dropped onto the larger disc.
- An arrow indicating the direction of rotation.

The diagram serves to illustrate the setup and interaction of the two discs in the experiment.
Transcribed Image Text:**Rotational Motion and Angular Momentum** In this educational exercise, we explore the concepts of angular velocity and angular momentum through a practical example involving a rotating disc. ### Problem Statement A disc (thin cylinder) with the following properties: - Mass: 0.05 kg - Radius: 0.65 m This disc is rotating on a frictionless axle at a constant rate of 77 RPM (revolutions per minute). We are tasked with determining: 1. The angular velocity (\(\omega\)) in radians per second. 2. The angular momentum (L) in kg·m²/s. **Formulas:** - Angular Velocity, \(\omega = \frac{\text{RPM} \times 2\pi}{60}\) - Angular Momentum, \(L = I \times \omega\) - Moment of Inertia for a disc, \(I = \frac{1}{2} m r^2\) ### Additional Scenario A second disc with the following properties: - Mass: 0.02 kg - Radius: 0.23 m This second disc is dropped onto the first disc, and they rotate together. We need to find: 1. The final angular velocity (\(\omega\)) of the system. 2. The final RPM of the system. **Diagram Description:** The diagram depicts: - A vertical axle with a larger disc at the bottom rotating in a horizontal plane. - A smaller disc above, aligned to be dropped onto the larger disc. - An arrow indicating the direction of rotation. The diagram serves to illustrate the setup and interaction of the two discs in the experiment.
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