Water and Oxygen.
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Answer:
ideal machine is the machine in which input work is equal to output work....
output work is the work or energy that comes out of a process.
The work or energy supplied to a machine.
Yes . Cracking knuckles can even de-shape your fingers . In an older age , your joints could become weaker as compared to a normal person who practices less cracking of knuckles . It damages the hand's ligament .
