Asked by medha painuly | 14th Oct, 2014, 12:22: PM
Let m be the mass of an object tied to a string of length l. A variable force F is applied to bob.
Let θ be the angle with vertical as shwon in figure.
Accroding to work - Energy theorem,
Change in P.E.=Work done
At pont A P.E. is zero , when it comes at pont B P.E. is maximum
hence work done W=mgL(1-Lcosθ)
Answered by Priyanka Kumbhar | 16th Oct, 2014, 09:28: AM
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