# physics

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The Young's modulus for steel is 2x1011 and its rigidity modulus is 8x1010 Nm-2. Find the Poisson's ratio and its bulk modulus.

• physics -

How is this a challenge?
a google search shows up the simple formula

E=2G(r+1)

2*10^11 = 2*8*10^10(r+1)
1/8 * 10 = r+1
1.25 = r+1
0.25 = r

• physics -

Also, for Bulk modulus K,

E = 3K(1-2r)
2*10^11 = 3K(1-2*.25)
2*10^11 = 1.5K
K = 1.33*10^11

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