Answer:
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Explanation:
Answer:
transports solid materials
Answer:
For uniaxial tension the objective is to minimize cost:
C = mCm= ALrCm where m is mass, A is the cross-section area, r is density, and Cm is cost per unit mass. For strength limited design: F/A ≤sy, and A ≥ F/sy To minimize C = (F/sy) LrCm= (FL)(rCm/sy), minimize the quantity (rCm/sy). Maximize the material index,M =sy/(rCm)
b. The objective is to minimize cost C = mCm= b2LrCm, where A = b2 is the cross-section for strength limited design. It is necessary to eliminate the variable b from the equation.
Now if A= b2
Then b=A/2
Therefore cost C= mCm=A/2.2LrCm
= ALrCm
