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    natdogg334 Posts: 2, Reputation: 1
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    #1

    Mar 22, 2010, 11:58 AM
    h = R(1-Cos(theta))
    Using trigonometry and Fig. 2 in the ballistic pendulum write-up, show that the height h the pendulum rises after capturuing the ball is given by: h = R(1-cos(theta))
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    natdogg334 Posts: 2, Reputation: 1
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    #2

    Mar 22, 2010, 12:00 PM

    I thought that h = R(1-cos(theta)) was the same as h=Rsin(theta) which wouldn't make sense because h/R is not equal to sin(theta)... h is the vertical and theta is at the top...
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    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Mar 22, 2010, 02:33 PM

    Note that is NOT the same as . If that was true then you would have , but recall that actually:
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