Answer :
15,000J/.15% = 100,000 J
If you want to check,
Multiply 100,000 by .15 and you get 15,000 J
If you want to check,
Multiply 100,000 by .15 and you get 15,000 J
Answer:100,000Joules
Explanation:
Efficiency of machines is the ratio of work done by machine (work output) to the work put in the machine (work input)
Efficiency = Work output/Work input
Given efficiency = 15%
Work output = 15,000Joules
Work Input = ?
Substituting in the formula of efficiency
15% = 15,000/Work Input
15/100 = 15,000/Work Input
15× Work input = 15,000×100
15 × Work input = 1,500,000
Work input = 1,500,000/15
Work input = 100,000Joules