ICSE Class 10 Physics 2015 Solved Paper

A block and tackle system has V.R. =5.

Question : 38

Total: 74

Rohan exerts a pull of 150‌Kgf . What is the maximum load he can raise with this pulley system if its efficiency =75% ?

Solution:

Given : V.R. =5, Effort =150‌kgf, Efficiency =75%
‌ Efficiency ‌=‌

‌ M.A. ‌

‌ V.R. ‌

×100
75‌=‌

‌ M.A. ‌

×100
‌ M.A. ‌‌=‌

75×5

100

=3.75
‌ But ‌‌ M.A. ‌‌=‌

‌ Load ‌

‌ Effort ‌

3.75‌=‌

‌ Load ‌

150‌kgf

‌ Load ‌‌=3.75×150
‌=562.5‌kgf.

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