Machine Design
When the speed of belt increases,

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

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf
Permit each leaf to act as an overhanging beam
Make M/I constant throughout the length of the leaf

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