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flemj
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Homework Statement
A 0.23kg pendulum bob is attached to a string 1.2 long at an angle of 30 degrees. What is the change in the gravitational potential energy of the system as the bob swings from point A to point B
U=
Homework Equations
.5 mv^2 = mgl
U=E+K
The Attempt at a Solution
in the picture it looks like a string attached to a roof with the ball at rest touching the roof and swinging down to a position 35 degrees below I am just not sure how you use the angle of 35 in the problem