1.

To open the lid of bottle, 50 N force is needed, Siri wanted to open the lid with her maximum effort of 10 N, which of the following openers is suitable for doing it?

Answer» Correct Answer - `E_(A)=10N,E_(B)=12.5N,E_(C)=10 N,` Either A or C.
`M_(A)=(10)/(2)=5`
`M_(B)=(8)/(2)=4`
`M_(C)=(15)/(3)=5`
`E_(A)=(L)/(MA)=(50)/(5)=10N`
`E_(B)=(L)/(MA)=(50)/(4)=12.5N`
`E_(C)=(L)/(MA)=(50)/(5)=10N`
She can use opener A or C to open the lid.


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