- #1

fball558

- 147

- 0

**speed of chain??**

## Homework Statement

A chain of metal links with total mass M = 6 kg is coiled up in a tight ball on a low-friction table. You pull on a link at one end of the chain with a constant force F = 69 N. Eventually the chain straightens out to its full length L = 1.0 m, and you keep pulling until you have pulled your end of the chain a total distance d = 3.6 m.

Consider the point particle system:

What is the speed of the chain at this instant?

## Homework Equations

sqrt((2FA)/M) where F is force (69 n)

A is change in center of mass aka center of mass final - center of mass inital (this is where I am having some troubles)

M is mass (6 kg)

## The Attempt at a Solution

i not sure what A is for this equation. i tried 3 different ways as followes and i am wrong all 3 times

first

i figured that it would be 3.6 becuae it moved this far when i do the formula i get

9.09945

then i figured 3.6 + 1.0 (from length of chain) use formula using 4.6

and get 10.28591

finally i did half of length plus the 3.6 distance to get 4.1

did formula and got 9.7101

all these are wrong and I am out of ideas if you have one let me know

thanks