work out everything within the brackets first. then work out rest of equation.
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27 divided by (2 x 5 -7) = 27/10-7 =27/3 = 9
I usually start with the definition of work: Work = force * distance so... Force = work / distance Distance = work / force So, no. You had it backwards.
efficiency
Work for what?
If a machine has 100 percent efficiency, the output work = the input work. That's actually basically what the efficiency of a machine is - output work / input work * 100.