Physics
The modulus of rigidity is the ratio of

Volume stress to volume strain
Shearing stress to shearing strain
Longitudinal stress to longitudinal strain
Tensile stress to tensile strain

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases with depth
Because streamlining is required
To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure

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