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A 0.33- kg pendulum bob is attached to a string 1.2 m long and hangs vertically as shown in Figure 1. What is the change in the pendulum bob’s gravitational potential energy as it swings from the lowest point of the pendulum to a point that is 35 degree to the vertical?

  • physics -

    Figure from the geometry the change in vertical height.

    PE=mgh

  • physics -

    can you give the solution?

  • physics -

    Yes, I could.

    I will be happy to check your work, but you need to do your own thinking. Answer grazers learn nothing.

  • physics -

    p=mgh
    p=.33*9.8*(1.2-1.2*cos35)
    P=70.2M

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