Question

7)
. The physical quantities such as mechanical advantage
and efficiency of machine has no units, but are pure numbers.
Explain
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Answer 1

Answer:

 A simple machine is a mechanical device that makes our life easier. ... of physical quantities, the mechanical advantage is unit less ... The efficiency of a machine is 50 %.

Answer 2

Answer:

A simple machine is a mechanical device that makes our life easier , of physical quantities, the mechanical advantage is unit less , the efficiency of a machine is 50% .