Posted by clueless on Wednesday, November 10, 2010 at 7:10pm.
mass is irrelevant for pendulum, cancels
Figure out how high the child is above the low point when the chains are 31 deg from vertical
h = 3 (1 - cos 31)
U at top = m g h
Ke at bottom = U at to
(1/2) m v^2 = m g h
v = sqrt (2 g h)
thanks!
If the speed of the child at the lowest position is 2.50 m/s, what is the mechanical energy lost due to friction?
If the speed of the child at the lowest position is 2.50 m/s, what is the mechanical energy lost due to friction?
mechanical energy lost= PE at top-1/2 m vb^2 where vb is the speed at the bottom
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