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QAIPM-2001-Ph-2908: NEET 2001 Physics - Class 11 AIPM-2001-Ph-2908 Solution: 250 N force is required to raise 75 kg mass from a pulley. If…
250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3 m. the efficiency of pulley system will be
Multiple Choice Options
- A 0.25
- B 0.333
- C 0.75
- D 0.9
Step-by-Step Verified Solution
Load W = Mg = 75 _ 10 = 750 N
Effort (P) = 250 N
_ Mechanical advantage
= l o a d e f f o r t = W P = 750 250 = 3
Velocity ratio
= d i s t a n c e t r a v e l l e d b y e f f o r t d i s t a n c e t r a v e l l e d b y l o a d = 4
Efficiency ( _ ) = 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
= ( 3 / 4 ) _ 100 = 75 %