Question

a machine has an efficiency of 70 percent, how much work does the machine do when 20000 j of work is done on it a. 14000 b. 20600 c. 1400000 or c. 2860000

Answer 1

a. 14000

Step-by-step explanation:

Given parameters:

Efficiency of the machine = 70%

Work done on machine = 20000J

Unknown:

Work done by machine = ?

Solution:

Efficiency of a machine is determined by;

Efficiency =
`(Work done by machine)/(Work done on machine) x 100`

70 =
`(Work done by machine)/(20000)` x 100

70 =
`(work done by machine)/(200)`

Work done by machine = 70 x 200 = 14000J