Pushing force making an angle theta to t...

Pushing force making an angle `theta` to the horizontal is applied on a block of weight W placed on a horizontal table . If the angle of friction is `phi` , magnitude of force required to move the body is equal to :

`(W cos phi)/(cos ( theta-phi))`

`(W sin phi)/( cos ( theta +phi ))`

`(W tan phi )/( sin ( theta - phi))`

`(W sin theta)/( tan ( theta - phi )`

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