A block and tackle system has the its efficiency is 50% . The velocity ratio (VR) of the system is .

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Solution

The correct options are
B $4$
C $6$
Given,
Efficiency = $50$ %
Effort = $T$
Free body diagram of the system
Load = $Load = 4 \times T = 4 T$
We know that -
$M . A = \frac{Load}{Effort}$ $\Rightarrow M . A = \frac{4 T}{T} = 4$
$Efficiency η = \frac{M . A}{VR} \Rightarrow \frac{50}{100} = \frac{4}{VR} VR = 8 .$

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A block and tackle system has the its efficiency is 50% . The velocity ratio (VR) of the system is .

The correct options are B 4 C 6Given, Efficiency = 50% Effort = T Free body diagram of the system Load = Load = 4×T =4T We know that - M.A=LoadEffort⇒M.A=4TT=4 Efficiency η=M.AVR⇒50100=4VRVR=8.