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Give reason
1) The efficiency of a practical machine is less that 100%.
1) The efficiency of a machine can be increased by using lubricants in the movable parts. ​

Respuesta :

aniilsah555

Explanation:

  • The efficiency of a practicle machine is less than 100% because some of the applied force is wasted due to oovercoming friction.
  • The efficiency of a machine can be increased by using lubricants in the movable parts because lubricants helps to reduce friction.

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