Machine Design
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to

(1/2) × [M + √(M² + T²)]
(1/2) × √(M² + T²)
√(M² + T²)
M + √(M² + T²)

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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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