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%

30 %

Explanation:

The efficiency of a machine is defined as:

where

is the useful output energy

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

In percentage,

0.30 x 100 = 30 %

an obstruction

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ratio of distance traveled to time interval

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source of diverging light rays either luminous or illuminated

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explanation: