# Elasticity QuestionWatch

#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 ;-;
0
3 years ago
#2
Force would be the mv^2/r (circular motion)

Then you can use the young's modulus equation, maybe?
0
3 years ago
#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.
0
3 years ago
#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
0
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