Three cables are used to hang a traffic light as shown. All three cables have diameter d = 3 mm and are made out of 1045HR steel. If the failure criterion of the overall system is a safety factor SF, = 7 against yielding, what is the maximum traffic light weight that can be hung? - Take 0= 40°, L=12, and h = 5. W max 1045.1 B h A 0 N X0% C

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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**Title: Determining the Maximum Traffic Light Weight Using Cables**

**Overview**

In this example, we examine the structural setup for hanging a traffic light using three steel cables. Each cable has specific properties and is arranged in a geometric configuration. Our goal is to determine the maximum weight the system can support safely using a given safety factor.

**Material and Cable Specifications**

- **Material**: 1045HR Steel
- **Cable Diameter**: \(d = 3 \, \text{mm}\)

**Safety Considerations**

- **Safety Factor against Yielding**: \(SF_y = 7\)

**System Configuration**

- **Angle**: \(\theta = 40^\circ\)
- **Lengths**:
  - \(L = 12\)
  - \(h = 5\)

**Diagram Description**

The diagram illustrates the setup of a traffic light suspended by three cables attached to points B and C:

1. **Points**: 
   - Point A is where the traffic light is connected. 
   - Points B and C are the anchor points on structures.
   
2. **Cables**: 
   - The cable from A to B and A to C form angles \(\theta\) with the horizontal axis.

3. **Dimensions**: 
   - The configuration forms a right triangle with the horizontal distance \(L\) and the vertical distance \(h\).

**Objective**

Calculate the maximum traffic light weight (\(W_{\text{max}}\)) that can be safely supported by the setup using the failure criterion and safety factor.

**Result**

- The computed maximum weight (\(W_{\text{max}}\)) of the traffic light is \(\boxed{1045.1} \, \text{N}\).

This setup ensures that the traffic light system remains secure and operational under the specified conditions.
Transcribed Image Text:**Title: Determining the Maximum Traffic Light Weight Using Cables** **Overview** In this example, we examine the structural setup for hanging a traffic light using three steel cables. Each cable has specific properties and is arranged in a geometric configuration. Our goal is to determine the maximum weight the system can support safely using a given safety factor. **Material and Cable Specifications** - **Material**: 1045HR Steel - **Cable Diameter**: \(d = 3 \, \text{mm}\) **Safety Considerations** - **Safety Factor against Yielding**: \(SF_y = 7\) **System Configuration** - **Angle**: \(\theta = 40^\circ\) - **Lengths**: - \(L = 12\) - \(h = 5\) **Diagram Description** The diagram illustrates the setup of a traffic light suspended by three cables attached to points B and C: 1. **Points**: - Point A is where the traffic light is connected. - Points B and C are the anchor points on structures. 2. **Cables**: - The cable from A to B and A to C form angles \(\theta\) with the horizontal axis. 3. **Dimensions**: - The configuration forms a right triangle with the horizontal distance \(L\) and the vertical distance \(h\). **Objective** Calculate the maximum traffic light weight (\(W_{\text{max}}\)) that can be safely supported by the setup using the failure criterion and safety factor. **Result** - The computed maximum weight (\(W_{\text{max}}\)) of the traffic light is \(\boxed{1045.1} \, \text{N}\). This setup ensures that the traffic light system remains secure and operational under the specified conditions.
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