1- I use a rope 2.00m long to a swing a 10.0 kg weight aroundmy head. The tensio

Question

1- I use a rope 2.00m long to a swing a 10.0 kg weight aroundmy head. The tension in the roper is 20.0 N. In half a revolutionhow much work is done by the rope on the weight. 2-A very light cart holding a 300 N box is moved at constantvelocity across a 15 m level surface. What is the net force done inthe process? 1- I use a rope 2.00m long to a swing a 10.0 kg weight aroundmy head. The tension in the roper is 20.0 N. In half a revolutionhow much work is done by the rope on the weight. 2-A very light cart holding a 300 N box is moved at constantvelocity across a 15 m level surface. What is the net force done inthe process?

Explanation / Answer

a) work done by rope on weight is zero... as the force applied by rope is always perpendicular to thedisplacement of weight(as its a circular motion)......force of ropeis working as a centripetal force.......and as the displacement ofweight is perpendicular to force applied by rope its work done iszero u can also see this by formula where work done = f s cos where is the angle between force and displacement hence        work done = f s cos 90                         = 0 b) it is similar to above question cart is applying force on block equal to its weight normalto surface and its displacement is perpendicular to it so again work done= f s cos = f s cos90 = 0 i hope everything is clear to u know......

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