Determine-the-speed-with-which-block-B-rises-in-figure-if-the-end-of-the-cord-at-A-is-pulled-down-with-a-speed-of-2-m-s-

Question Number 20344 by Tinkutara last updated on 25/Aug/17

Determine the speed with which block

B rises in figure if the end of the cord at

A is pulled down with a speed of 2 m / s .

Commented by Tinkutara last updated on 25/Aug/17

Commented by ajfour last updated on 25/Aug/17

0.5 m / s .

i f b l o c k r i s e s b y y, t h e n E g o e s

u p b y y, a n d C c o m e s d o w n b y y .

l e n g r h o f r o p e t h a t a v a i l a b l e f o r

p u l l = 4 y = x (s a y)

n o w 4 (\frac{d y}{d t}) = \frac{d x}{d t}

4 v_{b l o c k} = 2 m / s

v_{b l o c k} = 0.5 m / s .

Commented by Tinkutara last updated on 25/Aug/17

Thank you very much Sir!

Answered by Tinkutara last updated on 27/Aug/17

Commented by Tinkutara last updated on 27/Aug/17

This is my try! Please do not delete

your own solution ajfour Sir .

Commented by Tinkutara last updated on 27/Aug/17

Total length of string

= 3 x + 4 (y - x) = 4 y - x = C

Differentiating w . r . t time,

4 v_{B} = v_{A}

\Rightarrow v_{B} = 2 \div 4 = 0.5 m / s