Question

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 × 102 kg/mm2 (thus, a strand of grunerite with a 1−mm2 cross-sectional area can hold up to 3.5 × 102 kg). The tensile strengths of aluminum and Steel No. 5137 are 2.5 × 104 lb/in2 and 5.0 × 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 8.72 μm2. Give your answer in scientific notation to the correct number of significant figures.

Aluminum:

Steel No. 5137:

Answer 1

uoer 3.5t k Is

Ae 1468 .[4 not db 1 0 ODO 884