Machine Design
The rated life of a bearing varies

Directly as load
Inversely as square of load
Inversely as fourth power of load
Inversely as cube of load

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open and crossed belt drives transmit same power
Power transmission does not depend upon open and crossed types of constructions
Open belt drive transmits more power than crossed belt drive
Crossed belt drive transmits more power than open belt drive

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