A resistance of 1400 N is being overcome by a simple machine of velocity ratio 7 and efficiency of 90% .Find the
a) mechanical advantage
b) effort required to overcome the resistance

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Solution

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$e f f i c i e n c y = \frac{m e c h a n i c a l a d v a n t a g e}{v e l o c i t y r a t i o} m e c h a n i c a l a d v a n t a g e = \frac{90}{100} \times 7 = 6.3 M e c h a n i c a l a d v a n t a g e = \frac{L o a d}{e f f o r t} e f f o r t = \frac{1400}{6.3} = 222.22 N R E G A R D S$

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