Question

the motor is 75% efficient. explain what does it mean

Answer 1

Answer:

given efficiency of the machine is 75% and it is spending 12 J of energy to lift that mass

according to the law of conservation of energy the stored potential energy in the mass will be converted to its kinetic energy. hence,

(12×75)/100=(m×v 2 )/2

V= 18m/s

Answer 2

Explanation:

The more efficient the machine, the less energy wasted. For example, if a heat engine is able to turn 75 percent of the fuel it receives into motion, while 25 percent is lost as heat in the process, it would be 75 percent efficient. Out of the original 100 percent of the fuel, 75 percent was output as useful work.