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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
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.
Homework Equations
mgh=energy of grav.
Force*displacement=diss. energy
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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