Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

[(√P1 + √P2)/2]²
[⅟₂ × (P1 + P2)] + Pc
⅟₂× (P1 + P2)
P1 + P2

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Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley decreases
The power transmitted will decrease
The coefficient of friction between the belt and pulley increases
The power transmitted will increase

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