A machine with 80% efficiency does 4,000 J of work. Using the machine how much work did you do?
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0.8 x = 4,000
To find out how much work you did using the machine, you can use the formula:
Work done = Input energy * Efficiency
Since the machine has an efficiency of 80% or 0.8, and it has done 4,000 J of work, we can rearrange the formula to solve for the input energy.
Input energy = Work done / Efficiency
Substituting the given values into the equation:
Input energy = 4,000 J / 0.8
Input energy = 5,000 J
Therefore, you did 5,000 J of work using the machine.