A man drags an m kg crate across a floor...

A man drags an m kg crate across a floor by pulling on a rope inclined at angle `theta` above the horizontal. If the coefficient of static friction between the floor and crate is then the tension required in the rope to start the crate moving is :

`(mu_(s)mg)/((sin theta-mu_(s)costheta))`

`(mu_(s)mg)/((sin theta+mu_(s)costheta))`

`(mu_(s)mg)/((cos theta-mu_(s)sintheta))`

`(mu_(s)mg)/((cos theta+mu_(s)sintheta))`

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