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Q.

What internal pressure (in the absence of an external pressure) can be sustained by a glass spherical flask, if wall thickness is equal to $Δ r$ , radius of flask is r, and breaking stress of glass is $σ_{u}$ :

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a

$σ_{u} \frac{Δ r}{r}$

b

$\frac{1}{2} σ_{u} \frac{Δ r}{r}$

c

$4 σ_{u} \frac{Δ r}{r}$

d

$2 σ_{u} \frac{Δ r}{r}$

answer is C.

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What internal pressure (in the absence of an external pressure) can be sustained by a glass spherical flask, if wall thickness is equal to Δr , radius of flask is r, and breaking stress of glass is σu :