Machine Design
The creep in the belt is due to

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

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Machine Design
A woodruff key is

Fitted in pairs at right angles
A tapered key with head at one end
All of these
Capable of tilting in a recess milled out in the shaft

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