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7. The main challenge for students in this type of problem seems to be working out the
trigonometry in order to obtain the height of the ball (relative to the low point of the
swing)
h
=
L
–
L
cos
θ
(for angle
measured from vertical as shown in Fig. 834). Once
this relation (which we will not derive here since we have found this to be most easily
illustrated at the blackboard) is established, then the principal results of this problem
follow from Eq. 712 (for
W
g
) and Eq. 89 (for
U
).
(a) The vertical component of the displacement vector is downward with magnitude
h
, so
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Work

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