If a particular ligament has an effective spring constant of 144 N/mm as it is stretched, what is the tension in this ligament when it is stretched by 0.790 cm?

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Chapter1: Units, Trigonometry. And Vectors
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### Ligament Tension and Extension Relationship

**Required Information:**

The tension in a ligament in the human knee is approximately proportional to the extension of the ligament, provided that the extension is not too large.

**Problem Statement:**

If a particular ligament has an effective spring constant of 144 N/mm, what is the tension in this ligament when it is stretched by 0.790 cm?

**Solution:**

Convert the extension from centimeters to millimeters:  
\( 0.790 \, \text{cm} = 7.90 \, \text{mm} \)

Using Hooke’s Law, \( F = k \times x \), where \( F \) is the force (tension), \( k \) is the spring constant, and \( x \) is the extension.

- \( k = 144 \, \text{N/mm} \)  
- \( x = 7.90 \, \text{mm} \)

\[ F = 144 \, \text{N/mm} \times 7.90 \, \text{mm} = 1137.6 \, \text{N} \]

Convert tension to kilonewtons (kN):  
\[ 1137.6 \, \text{N} = 1.1376 \, \text{kN} \]

However, the given solution marks the tension as **0.5688 kN**. Verify calculations by ensuring proper conversions and consider verifying assumptions or conditions outlined in the problem statement.
Transcribed Image Text:### Ligament Tension and Extension Relationship **Required Information:** The tension in a ligament in the human knee is approximately proportional to the extension of the ligament, provided that the extension is not too large. **Problem Statement:** If a particular ligament has an effective spring constant of 144 N/mm, what is the tension in this ligament when it is stretched by 0.790 cm? **Solution:** Convert the extension from centimeters to millimeters: \( 0.790 \, \text{cm} = 7.90 \, \text{mm} \) Using Hooke’s Law, \( F = k \times x \), where \( F \) is the force (tension), \( k \) is the spring constant, and \( x \) is the extension. - \( k = 144 \, \text{N/mm} \) - \( x = 7.90 \, \text{mm} \) \[ F = 144 \, \text{N/mm} \times 7.90 \, \text{mm} = 1137.6 \, \text{N} \] Convert tension to kilonewtons (kN): \[ 1137.6 \, \text{N} = 1.1376 \, \text{kN} \] However, the given solution marks the tension as **0.5688 kN**. Verify calculations by ensuring proper conversions and consider verifying assumptions or conditions outlined in the problem statement.
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