Physics: Amachine uses 1000 j of electric energy to raise a heavy mass, increasing its potential energy by 300 j. what is the efficiency of this process? 35%100%85%70%30%

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Amachine uses 1000 j of electric energy to raise

jones501324

17.01.2022

30 %

Explanation:

The efficiency of a machine is defined as:

$\epsilon = \frac{E_{useful}}{E_{input}}$

where

$E_{useful}$ is the useful output energy

$E_{input}$ is the energy in input

In this problem,

- The useful output energy is the increase in potential energy of the mass, so 300 J

- The energy in input to the machine is 1000 J

Therefore, the machine's efficiency is

$\epsilon = \frac{300 J}{1000 J}=0.30$

In percentage,

0.30 x 100 = 30 %

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