Velocidades em Movimento de Blocos

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64 
 
PROBLEM 11.51 
Slider block B moves to the right with a constant 
velocity of 300 mm/s. Determine (a) the velocity 
of slider block A, (b) the velocity of portion C of 
the cable, (c) the velocity of portion D of the 
cable, (d) the relative velocity of portion C of the 
cable with respect to slider block A. 
 
SOLUTION 
 
From the diagram ( ) 2 constantB B A Ax x x x+ − − = 
Then 2 3 0B Av v− = (1) 
and 2 3 0B Aa a− = (2) 
Also, we have constantD Ax x− − = 
Then 0D Av v+ = (3) 
(a) Substituting into Eq. (1) 2(300 mm/s) 3 0Av− = 
 or 200 mm/sA =v 
(b) From the diagram ( ) constantB B Cx x x+ − = 
 Then 2 0B Cv v− = 
 Substituting 2(300 mm/s) 0Cv− = 
 or 600 mm/sC =v 