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A spherical pressure vessel is made of thin magnesium plate 0.25 cm thick. The main diameter of the sphere is 600 cm and allowable stress in tension is 900 kg/cm2. The safe internal gas pressure for the vessel would be

[A].	0.5 kg/cm2	[B].	1.5 kg/cm2
[C].	3.0 kg/cm2	[D].	4.77 kg/cm2
[E].	5.5 kg/cm2

Answer: Option B

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