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A particle is pulled a distance lup a ro...

A particle is pulled a distance `l`up a rough plane inclined at an angle `alpha` to the horizontal by a string inclined at an angle `beta` to the plane `(beta + lt 90^@)`. If the tension the string is T, the normal reaction between the partical and plane is N, the frictional force is F, and the weight of the particle is `w`. write down expression for the work done by each of forces.

Text Solution

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The correct Answer is:
A, B, C
`W_(T) =(T) (l)cos beta`
.
`W_(N) = (N) (l)cos 90^@ =0`
`W_(W) =(W)(l) (90 + alpha) =-W l sin alpha`
`W(f) =(F) (l) cos 180^@ =- Fl`.
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