Define efficiency of a simple machine? Do you think that in actual practice the efficiency of a machine is 100°/•? If not, explain the reason?

Explanation:

Part 1 :

The efficiency of a simple machine is defined as the ratio of useful work done by the machine ( output work ) to the total work put into the machine ( input work ).

Part 2 :

In practice , the work output of a machine is always less than the work input due to the effect of friction. Since, there is always some loss of energy in the machine , if the frictional force in machines increases , efficiency decreases. Because machines are not frictionless in practice , efficiency of a machine is never 100% or greater.

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there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.