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Here input energy of 893 J was absorbed by the machine and give us a successful work of 450 J. From the rest 443 J are expelled as heat.
So efficiency = (successful work done)/(Energy input)*100%
So the efficiency of the machine is 50.39%.
Always the efficiency of the machines are less than 100% due to the losses like heat, sound, vibration etc. If we use the expelling heat for another work we can increase the efficiency of the whole system.
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