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The mechanical advantage of a level is the ratio of the output force to the input force.
The mechanical advantage of a wheel and axle is the ratio of the radius of the wheel to the radius of the axle.
Efficiency= Mechanical Advantage Speed ratio X100 Mechanical advantage divided by speed radio X (times) 100
Engine efficiency is increased though compression ratio by allowing a more thermodynamic energy to be converted into mechanical energy. Energy transfer is the key to efficiency.
If the ratio of similarity is 310, then the ratio of their area is 96100.