Max (mass = 15 kg) is hanging from one end of a 13-m long bungee cord that has its other end fixed to a bridge above. The bungee cord has a circular cross section with a diameter of 2. 5 cm, and a young’s modulus of 17 mpa. What is the stress in the bungee cord due to max’s weight?

Respuesta :

The stress experimented by the bungee cord due to Max's weight is approximately 299.680 kilopascals.

How to find the stress experimented by the bungee cord

Let suppose that the stress ([tex]\sigma[/tex]), in pascals, experimented by the bungee cord is entirely elastic and uniform. By Newton's Laws we know that the tension ([tex]T[/tex]), in newtons, experimented by the cord equals Max's weight. The stress on the bungee cord is axial and is described by following formula:

[tex]\sigma = \frac{m\cdot g}{\frac{\pi\cdot D^{2}}{4} }[/tex]   (1)

Where:

  • [tex]m[/tex] - Max's mass, in kilograms
  • [tex]g[/tex] - Gravitational acceleration, in meters per square second
  • [tex]D[/tex] - Diameter of the circular cross section, in meters

If we know that [tex]m = 15\,kg[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex] and [tex]D = 0.025\,m[/tex], then the stress experimented by the bungee cord is:

[tex]\sigma = \frac{(15\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)}{\frac{\pi}{4}\cdot (0.025\,m)^{2} }[/tex]

[tex]\sigma \approx 299679.845\,Pa\, (299.680\,kPa)[/tex]

The stress experimented by the bungee cord due to Max's weight is approximately 299.680 kilopascals. [tex]\blacksquare[/tex]

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