Machine Design
The creep in the belt is due to

Stresses beyond elastic limit of belt material
Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions
Material of belt

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Maximum at the centroidal axis and zero at the outer surface of the member
Maximum at both the centroidal axis and outer surface of the member
Zero at both the centroidal axis and outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member

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