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**1. Homework Statement**

A 0.5 kg bead slides on a curved wire, starting

from rest at point A as shown in the figure.

The segment from A to B is frictionless, and

the segment from B to C is rough. The point

A is at height 6.9 m and the point C is at

height 1.6 m with respect to point B.

The acceleration of gravity is 9.8 m/s^2 :

http://img376.imageshack.us/img376/2720/motion8pj.gif [Broken]

the image for this problem is fig.2

If the bead comes to rest at C, find the change

in mechanical energy due to friction as it

moves from B to C. Answer in units of J.

**2. Homework Equations**

mgh=energy of grav.

Force*displacement=diss. energy

**3. The Attempt at a Solution**

First, I set mgh at point A to mgh at C + diss energy:

(.5)(9.8)(6.9)=.5(9.8)+diss.

diss=26J

the answer above is not right, am i misunderstanding the question?

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