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# Elasticity Question watch

1. A hammer throwerswings a 7.25kg hammer in a horizontal circle at one revolution per second Ifthe hammer wire is 1.20 m long. 1.5 mm in diameter and made of steel, calculatethe extension produced in it.(The mass of the wire itself may be neglected)
I'm trying to use the young's modulus equation, but am very confused ;-;
2. Force would be the mv^2/r (circular motion)

Then you can use the young's modulus equation, maybe?
3. (Original post by atomicjellyfish)
A hammer throwerswings a 7.25kg hammer in a horizontal circle at one revolution per second Ifthe hammer wire is 1.20 m long. 1.5 mm in diameter and made of steel, calculatethe extension produced in it.(The mass of the wire itself may be neglected)
I'm trying to use the young's modulus equation, but am very confused ;-;
All of the variables needed are given in the question. But you must also calculate the centripetal force exerted on the cable:

Now using the definition of Youngs modulus:

Rearrange to make the subject.

You will need to look up the modulus for steel.
4. (Original post by uberteknik)
All of the variables needed are given in the question. But you must also calculate the centripetal force exerted on the cable:

Now using the definition of Youngs modulus:

Rearrange to make the subject.

You will need to look up the modulus for steel.
Basically what I said: F = mv^2/r

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