Problem 511 | Friction

Problem 511
Find the least value of P required to cause the system of blocks shown in Fig. P-511 to have impending motion to the left. The coefficient of friction under each block is 0.20.
 

Two blocks connected by a cord

 

Solution 511

 
Mandris

May i know how you differentiate P?
Thank you

Jhun Vert
Jhun Vert's picture

Use the formula $d\left( \dfrac{c}{v} \right) = \dfrac{-c \, dv}{v^2}$.

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