Calculate the efficiency for each machine, then answer the question. machine a has an input work of 1,000 j and an output work of 250 j. machine b has an input work of 500 j and an output work of 350 j. machine c has an input work of 200 j and an output work of 150 j. which machine is the most efficient?

Explanation:

Efficiency is defined as the measure of amount of work done by a system.

Mathematically,        

         Efficiency =

                          =

                          = 25%

  Efficiency =

                          =

                          = 70%

  Efficiency =

                          =

                          = 75%

Thus, we can see that efficiency is maximum in machine C, therefore, machine C is the most efficient.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

i dont know but

explanation:

whoever your teacher is, deserves a raise for using pokemon as an example