Disk D turns with a constant clockwise angular velocity of 36 rad/s. Disk E has a weight of 60 lb and is initially at rest when it is brought into contact with D. The coefficient of kinetic friction between the two disks is = 0.3. Neglect the weight of bar BC. (Figure 1) Figure 2 ft -2 ft- 1 ft E D 1 of 1 > Part A Determine the time required for disk E to attain the same angular velocity as disk D. Express your answer to three significant figures and include the appropriate units. t = Value Submit μA Provide Feedback Request Answer Units ?

Elements Of Electromagnetics
7th Edition
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Author:Sadiku, Matthew N. O.
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### Educational Website Transcription:

#### Problem Statement

**Disk System Dynamics**

Disk \( D \) turns with a constant clockwise angular velocity of 36 rad/s. Disk \( E \) has a weight of 60 lb and is initially at rest when it is brought into contact with \( D \). The coefficient of kinetic friction between the two disks is \( \mu_k = 0.3 \). Neglect the weight of bar \( BC \). Refer to Figure 1.

#### Task

**Determine the Time for Angular Velocity Convergence**

Determine the time required for disk \( E \) to attain the same angular velocity as disk \( D \).

**Instructions:**

Express your answer to three significant figures and include the appropriate units.

---

### Diagram Explanation

**Figure 1:**

- The diagram shows two disks, \( D \) and \( E \).
- Disk \( D \) is rotating with an angular velocity of 36 rad/s.
- Disk \( E \), weighing 60 lb, is initially at rest and is shown engaging with disk \( D \).
- The system includes a vertical bar labeled \( BC \), which is connected to disk \( E \). The bar \( BC \) is 2 ft long, and the distance from the bar to the center of each disk is 1 ft.
- The attachment allows disk \( E \) to rotate when in contact with disk \( D \).

#### Additional Notes

- The problem requires you to consider the effects of kinetic friction (with a coefficient of \( \mu_k = 0.3 \)) in the interaction between the two disks.
- Neglect any impact from the weight of the bar \( BC \).

--- 

### Submission Instructions

Input your calculated time below using three significant figures, ensuring all relevant units are included.

\[ t = \text{Value} \, \text{Units} \]

Submit your answer by filling in the field and clicking 'Submit.' For any doubts or questions, use the 'Request Answer' or 'Provide Feedback' options.

---
Transcribed Image Text:### Educational Website Transcription: #### Problem Statement **Disk System Dynamics** Disk \( D \) turns with a constant clockwise angular velocity of 36 rad/s. Disk \( E \) has a weight of 60 lb and is initially at rest when it is brought into contact with \( D \). The coefficient of kinetic friction between the two disks is \( \mu_k = 0.3 \). Neglect the weight of bar \( BC \). Refer to Figure 1. #### Task **Determine the Time for Angular Velocity Convergence** Determine the time required for disk \( E \) to attain the same angular velocity as disk \( D \). **Instructions:** Express your answer to three significant figures and include the appropriate units. --- ### Diagram Explanation **Figure 1:** - The diagram shows two disks, \( D \) and \( E \). - Disk \( D \) is rotating with an angular velocity of 36 rad/s. - Disk \( E \), weighing 60 lb, is initially at rest and is shown engaging with disk \( D \). - The system includes a vertical bar labeled \( BC \), which is connected to disk \( E \). The bar \( BC \) is 2 ft long, and the distance from the bar to the center of each disk is 1 ft. - The attachment allows disk \( E \) to rotate when in contact with disk \( D \). #### Additional Notes - The problem requires you to consider the effects of kinetic friction (with a coefficient of \( \mu_k = 0.3 \)) in the interaction between the two disks. - Neglect any impact from the weight of the bar \( BC \). --- ### Submission Instructions Input your calculated time below using three significant figures, ensuring all relevant units are included. \[ t = \text{Value} \, \text{Units} \] Submit your answer by filling in the field and clicking 'Submit.' For any doubts or questions, use the 'Request Answer' or 'Provide Feedback' options. ---
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