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  • i wonder if my brain still works?

    A simple physics problem.
    If Tarzan has a mass of 80kg and he swings from a 15m vine which is intially horizontal and swings down to Jane who has a mass of 60kg, how high is the highest branch they can reach? (ignore friction/resistance) Usethe fact that energy intial = energy final

  • #2
    8.57 meters? Potential energy initial = potential energy final (assuming 100% potential energy is converted to kinetic energy, then 100% transfered back to potential energy)

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    • #3
      mmm...thats not what i got, but my brain is practicly fried

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      • #4
        wow, im just learning this in physics class.

        the initial woudnt be the same as the final becuase mass was added at the bottem of the swing (jane) right?

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        • #5
          correct, but the height is different, thereby making the two equal

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          • #6
            Here's what I figure:

            P.E. initial = 80 kg * 15 m * 9.8 m/s^2 = 11760 Joules

            Therefore, 11760 Joules = (mass final kg) * (height final meters) * 9.8 m/s^2
            11760 Joules = (80+60 kg) * X meters * 9.8 m/s^2

            Solve for X: 11760/((80+60)*9. = 8.57 meters


            Maybe I'm making this too simple?

            edit: for some reason there's a smily face in place of what should be an 8

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            • #7
              i do believe you are right. some how i ended up with 20m as my answer but i think that is incorrect.

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              • #8
                i don't believe this...

                ...NOT for a second...

                Are you guys telling me that Tarzan was doing these calculations in his head and yodeling at the same time? And how the heck was he doing ANY calcuations at all after he grabbed hold of Jane?

                GOOD GRIEF...

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                • #9
                  They'll be going nowhere.

                  You see, Jane is not a swinger. Much to the frustration of Tarzan, who has begger her several time to try it. Jane simply insists on being a one man lady.

                  No swinging for her.

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                  • #10
                    LMAO mithuth !!!!!

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                    • #11
                      LOL!

                      10 char.

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                      • #12
                        Math people scare me. Like my friend Jim who does algebra in his head whilehe's driving to keep from getting bored.

                        Ya'll give me the heebie geebies.


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                        • #13
                          ha...well the correct answer is in fact 8.57...m, some how i only divided by jane's weight and not the both of them together

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                          • #14
                            Originally posted by Schulzy190
                            ha...well the correct answer is in fact 8.57...m, some how i only divided by jane's weight and not the both of them together
                            I knew that...

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