A block placed on a horizotnal surface i...

A block placed on a horizotnal surface is being pushed by a force F making an angle `theta` with the vertical. If the friction coefficient is `mu`. How much force is needed to get the block just started. Discuss the situation when `tan thetaltmu`.

`(mu)/("sin"theta-mu"cos"theta)`

`2(mu)/("sin"theta+mu"cos"theta)`

`(mu)/("sin"theta+mu"cos"theta)`

`(mu)/("cos"theta-mu"cosin"theta)`

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