EK lecture 117

[Mcat35]

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The sole of a certain tennis shoe has a shear modulus of 4x 10^7. If the height of the sole is doubled, the strain will,

answer: Remain the same.

Also this one which EK just asked but did not give answer for.

If the area of an object is increased by a factor of 2, how will this affect the fractional change in length?

I'm just trying to make sure that I have the right thought process.

 

[SChiO]

If the area of an object is increased by a factor of 2, how will this affect the fractional change in length?

I'm just trying to make sure that I have the right thought process.

Can anyone answer this last part???

 

[sdm33]

I am not sure but I will try.
F/A = S . change of X / L
The strain is the based on the change on X and the not the length.
A bout the area, it will effect the pressure depend on its shape, but because the length is going to change the area will not have an effect on it, however the delta X will have a change.
As the area decreases the pressure will decease and the strain ( change X) decreases as well.

 

[SChiO]

Ok I understand that way of thinking....thanks