Engineers desire to model the magnitude of the elastic force of a bungee cord using the equation (x + 8) m 8 m F(x) = a 8 m (x + 8) m where x is the stretch of the cord along its length and a is a constant. If it takes 23.0 kJ of work to stretch the cord by 18.0 m, determine the value of the constant a (in N). 404 X N

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### Elastic Force Model of a Bungee Cord

Engineers aim to model the magnitude of the elastic force of a bungee cord using the equation:

\[ F(x) = a \left[ \left( \frac{x + 8 \text{ m}}{8 \text{ m}} \right) - \left( \frac{8 \text{ m}}{(x + 8 \text{ m})} \right) \right]^2 \]

where \( x \) represents the stretch of the cord along its length, and \( a \) is a constant.

**Problem Statement:**

If it requires 23.0 kJ of work to stretch the cord by 18.0 m, calculate the value of the constant \( a \) (in Newtons).

**Solution Attempt:**

The box shown with "404" and a red "X" indicates an incorrect value for \( a \) (in N).

This presentation reflects an interactive problem where students can input and verify their answers to understand the calculation of force in elastic materials.
Transcribed Image Text:### Elastic Force Model of a Bungee Cord Engineers aim to model the magnitude of the elastic force of a bungee cord using the equation: \[ F(x) = a \left[ \left( \frac{x + 8 \text{ m}}{8 \text{ m}} \right) - \left( \frac{8 \text{ m}}{(x + 8 \text{ m})} \right) \right]^2 \] where \( x \) represents the stretch of the cord along its length, and \( a \) is a constant. **Problem Statement:** If it requires 23.0 kJ of work to stretch the cord by 18.0 m, calculate the value of the constant \( a \) (in Newtons). **Solution Attempt:** The box shown with "404" and a red "X" indicates an incorrect value for \( a \) (in N). This presentation reflects an interactive problem where students can input and verify their answers to understand the calculation of force in elastic materials.
**Problem Statement:**

A bungee cord exerts a nonlinear elastic force of magnitude \( F(x) = k_1 x + k_2 x^3 \), where \( x \) is the distance the cord is stretched. The constants are given as \( k_1 = 207 \, \text{N/m} \) and \( k_2 = -0.250 \, \text{N/m}^3 \). How much work (in kJ) must be done on the cord to stretch it \( 14.0 \, \text{m} \)?

**Solution:**

The input box shows a calculated value of \( 30.968 \) with a unit of kilojoules (kJ). 

The wrong answer is indicated by a red "X" next to the value.

The correct answer is not provided.
Transcribed Image Text:**Problem Statement:** A bungee cord exerts a nonlinear elastic force of magnitude \( F(x) = k_1 x + k_2 x^3 \), where \( x \) is the distance the cord is stretched. The constants are given as \( k_1 = 207 \, \text{N/m} \) and \( k_2 = -0.250 \, \text{N/m}^3 \). How much work (in kJ) must be done on the cord to stretch it \( 14.0 \, \text{m} \)? **Solution:** The input box shows a calculated value of \( 30.968 \) with a unit of kilojoules (kJ). The wrong answer is indicated by a red "X" next to the value. The correct answer is not provided.
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