Chemistry
posted by Anon .
a)The Young's modulus for a material is 5.0*10^10 N/m2. The material is stretched to a strain of 4.0*10^3. How much elastic energy will be expended? (Express your answer in J/m3)
Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1366 K. Assume the preexponential factor is one.
Can someone help me with those questions? I can help with the rest!!

Hi I am working on it. Meanwhile Can you help me with the 3th and 4th questions about the graphics?

3//1.13 ev
semiconductor
4//4th option
ntype
4th option
intrinsic 
Hi can you help me with first part of 1st question .
answer of 2nd part is 189 
can u help me with the formula of Cu bsc me temperature is 1056 plssssssssssssssssss help

Determine for solid manganese (Mn) the following:
What is the atomic density (atoms/m) along the [110] direction of the Mn crystal?
What are the number of nearest neighbors around an atom in the Mn crystal?
Calculate the interplanar spacing (m) between {220} planes in the Mn crystal. 
if someone help with those questions I'll post all the rest of answers

ΔHv=104,000J/6.02×10^23=1,7276*10^19
nv/Ns=e^{(1.7276*10^19)/[(1.381×10^−23)*(1366)]}=Result
Use the result to substitute to:
nv/Ns*ρ*Avogadro number/Mw(Cu)
=
nv/Ns(result from above) * 8.94*( 6.02*10^23/63.546) 
watch out that the formula is negative (on e), so it should be in the range of x*10^4 or 10^5!
And note, that I can not give you the right answer as I succeeded only on my third attempt :)
I need help with 11 and 12. 
1 7.36e2
189
2metal
Solid hydrogen has a half filled sband
insulator
Solid helium has a filled sband
31.13
semiconductor
4Ionization of phosphorus requires some minimum temperature
n_type
The concentration of conduction electrons is fixed by the concetration of phosphorus
intrinsic
52.44e9
8
1.025e10
61.8e10
7BCC
3.172
1.37
8 HELP !!!!!!!!!!!!!!!!!!!!!!!!!!
9(for energy 104 kj and vacancy density 1366 K) 8924699659276140118.9689358889623
10sample A
sample B
sample B
sample D
sample C
sample C
11increase air flow on the bottom array
122.773e2
132.58e16 
The Young's modulus for a material is 8.0 x 1010 N/m2. The material is stretched to a strain of 9.0 x 103. How much elastic energy will be expended? (Express your answer in J/m3).
Answer: 3240000 
@Drew can you give me the formula?

Ev= elastic strain energy per unit vol=?
Ev=(1/2)*Ey*E2(square)
Ey= 8.0*10e+10 N/m2
E= 9.0e3 so square >
E2= 8.1e5 
thanks

Did you find the last quetion of homework 11?

No, I didn't find that answer.

can u help me with the formula of Cu bsc me temperature is 1056 plssssssssssssssssss help

nv/Ns=A*e(Hv/(KT))
K=1.381E23
Hv= 104000/6.023e+23
A=1
vacancy density=(nv/Ns)*Cu density*(6.023e+23/Cu atomic weight) 
thnks @ Drew :)

Thanks Anon and Drew for the formula, I have other exams to prepare for so this was a life saver, I appreciate it truly. I however do not know how to calculate my result using exponents so can someone please solve for T=1373 K? I would be forever grateful. If I find the answers for the last few questions I will be sure to share it.

oops I reset it, new value of T is 1091 K somebody help please :'(

Never mind guys, alphawolfram did it for me :)~ any luck with the last three questions? Today is the deadline!
Respond to this Question
Similar Questions

Chemistry
The Young's modulus for a material is 8.0 x 1010 N/m2. The material is stretched to a strain of 2.0 x 103. How much elastic energy will be expended? 
chemestry
The Young's modulus for a material is 11.0 x 1010 N/m2. The material is stretched to a strain of 1.0 x 103. How much elastic energy will be expended? 
Chemistry
The Young's modulus for a material is 2.0 x 1010 N/m2. The material is stretched to a strain of 5.0 x 103. How much elastic energy will be expended? 
chemistry
The Young's modulus for a material is 15.0 x 1010 N/m2. The material is stretched to a strain of 6.0 x 103. How much elastic energy will be expended? 
chemistry
The Young's modulus for a material is 15.0 x 10^10 N/m2. The material is stretched to a strain of 6.0 x 10^3. How much elastic energy will be expended? 
Chemistry
The Young's modulus for a material is 2.0 x 1010 N/m2. The material is stretched to a strain of 5.0 x 103. How much elastic energy will be expended? 
Materials Science
Aluminum is a cubic crystal, with S11=1.59×10−11 m2/N S12=−0.58×10−11 m2/N S44=3.52×10−11 m2/N What are the Young's modulus, Poisson's ratio and shear modulus, corresponding to these values? 
Mechanical Behavior of Materials
What is the exact strain energy per unit length of an edge dislocation for a material that has a Young's modulus E of 50GPa, a Burger's vector b of 0.25nm, a dislocation density ρ of 108cm−2, and a Poisson's ratio ν … 
sciencecollege physics
2. A certain wire of length L, crosssectional area A is extended by an amount ‘e’ by a force F. Given that the young’s modulus of the material of the wire is E, Show that the; a. Energy stored in the wire is given by the expression … 
sciencce
2. A certain wire of length L, crosssectional area A is extended by an amount ‘e’by a force F. Given that the young’s modulus of the material of the wire is E, Show that the; a. Energy stored in the wire is given by the expression …