A stretchy cord has a diameter of 0.33 mm when lying loose off the spool. Loops...

A stretchy cord has a diameter of 0.33 mm when lying loose off the spool. Loops are made on the two ends, 75.0 cm apart from knot to knot. The cord is hung vertically with one loop over a hook and the other with a 500 g mass hanging from it. After the mass is hung from it, the distance between the marks is now 79 cm.

a. What is the Young's modulus of the cord material?

b. If the same material also comes in a cord with diameter 0.66 mm, what would be its stretched length in the same scenario as above?

Expert Solution

part b can also be done using the relation that youngs modulus is inversly proportional to R^2

genius_generous answered 3 weeks ago

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