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- A hoist furnished with 90kW lifts 500kg to height of 12 m in 20 s. Find the efficiency of this machine. (Show solution)A force of 85 N is applied to the rim of the wheel can lift a load of 700 N through the use of wheel and axle. The diameters of the wheel and axle are 40 cm and 6 cm l, respectively. Determine the AMA, IMA and efficiency of the machine.Calculate the mechanical advantage.
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