Question

What do u mean by Effeciency of wheel and axle is 75%.​

Answer 1

Answer:

Solution: A machine that is 75% efficient means that 75% of the work input is obtained as the useful output and the remaining 25% has been lost in overcoming the friction.

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Answer 2

Answer:

It means 75% of our effort is converted into useful work and the rest 25% is wasted to overcome frictional and gravitational force in wheel and axle machines.

Explanation:

Efficiency

• It is defined as the percentage ratio of work output to the input work.
• It is denoted by a Greek word, eta (η), and calculated as,

        η=Output work/Input work x 100%

or, η= LxLd/ExEd x100%   [Output work=LxLd/Input work=ExEd]

or, η= $\frac{L/E}{Ed/Ld}$  x100%   [L/E=Mechanical advantage and Ed/Ld=Velocity ratio]

∴ η= M.A/V.R x100%

• The efficiency is expressed in percentage(%).
• In practice, no machine is 100 % efficient since the value of mechanical advantage(M.A) is always lesser than the velocity ratio (V.R).
• A machine that has 100% efficiency is called a perfect or ideal machine.

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