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vekshin1
4 years ago
12

For beam design, the cross section dimensions of the beam are determined: A. Based on allowable normal stress, but the allowable

shear stress should always be checked to be sure it is not exceeded. B. Based on the allowable shear stress, but the allowable normal stress should always be checked to be sure it is not exceeded. C. Such that both the allowable normal stress and the allowable shear stress are reached at the same time. D. Based on the allowable normal stress. E. The allowable shear stress is not an important design consideration.
Engineering
1 answer:
noname [10]4 years ago
8 0

Answer:

B. Based on the allowable shear stress, but the allowable normal stress should always be checked to be sure it is not exceeded

Explanation:

Shear stress is analyzed to determine the shear forces along the lenght of the beam. This is represented in a shear force diagram. The beam cross sectional design is determined in such a way as to minimize the shear stress. Allowable normal stress should always be checked in a structure if failure is to be prevented.

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Answer:

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Explanation:

given data

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solution

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σ = 2.69 × 10^{-2} N/m

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now here we know relation between pressure difference and surface tension

so we can derive difference pressure as

2π×σ×r = Δp×π×r²    .....................1

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put here value

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Δp = 538

so the difference in pressure between the inside and outside of the droplets is 538 Pa

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