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When effort is applied parallel to an inclined frictionless plane making an  angle theta  with horizontal surface, then mechanical advantage of system is a) sin theta b) tan theta c) cot theta d) cosec theta
Asked by acv27joy | 20 May, 2018, 08:41: PM
answered-by-expert Expert Answer
If surface is frictionless then input work is equal to output work.
Thus, work done by effort= work done on the load
 
 
From the above figure,
 
F × AC = W × BC 
 
W over F equals space fraction numerator A C over denominator B C end fraction fraction numerator begin display style B C end style over denominator begin display style A C end style end fraction equals space sin theta T h u s comma space W over F space equals fraction numerator 1 over denominator sin theta end fraction space rightwards double arrow M e c h a n i c a l space a d v a n t a g e space equals space W over F space equals fraction numerator 1 over denominator sin theta end fraction space equals space cos e c theta
Correct option is d) 
Answered by Shiwani Sawant | 21 May, 2018, 10:47: AM

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