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Describe the wheel and axle machine . Write down the relationship between the radii of...

Describe the wheel and axle machine . Write down the relationship between the radii of the wheel and axle and the force ratio. Using such a machine a load of 400N can be raised by a force of 80N applied to rim of the wheel. The radii of the wheel and axle are 32cm and 4cm respectively. Calculate the force ratio (mechanical advantage), the velocity ratio and efficiency of the machine?
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