PLEASE Can some one help me with this problem!! Be sure to answer all parts. Asb

Question

PLEASE Can some one help me with this problem!!

Be sure to answer all parts. Asbestos is a fibrous silicate mineral with remarkably high tensile strength. But it is no longer used because airborne asbestos particles can cause lung cancer. Grunerite. a type of asbestos, has a tensile strength of 3.5 times 102 kg/mm2 (thus, a strand of grunerite with a 1-mm2 cross-sectional area can hold up to 3.5 times 102 kg). The tensile strengths of aluminum and Steel No. 5137 are 2.5 times 104 lb/in2 and 5.0 times 104 lb/in2, respectively. Calculate the cross-sectional area (in mm2) of wires of aluminum and of Steel No. 5137 that have the same tensile strength as a fiber of grunerite with a cross-sectional area of 47.4 micro m2. Give your answer in scientific notation to the correct number of significant figures. Aluminum: Steel No. 5137:

Explanation / Answer

1 lb/in2=292.639653kg/mm2

let cross sectional area of aluminium = x and steel= y

hence, 2.5*10^4*292.639653*x=3.5*10^2*47.4

x=442.49 micro meter ^2

cross sectional area of aluminium =442.49 micro meter ^2=4.425*10^-4mm^2

and

5*10^4*292.639653*y=3.5*10^2*47.4

y= 221.25 micro meter ^2

cross sectional area of steel =221.25 micro meter ^2=2.212*10^-4mm^2

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