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A pendulum 18in. in length swings 72 degrees from left to right. what is the horizontal distance between where the pendulum begins and ends?

Guest Mar 2, 2017
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 #1
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We can use the Law of Cosines to solve this.....the horizontal distance, D, is given by:

 

D   =  sqrt  [ 18^2 + 18^2  - 2(18)(18)cos(72) ]  ≈ 21.16 inches

 

 

cool cool cool

CPhill  Mar 2, 2017
 #2
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wow

AlexanderTheGreat  Mar 2, 2017

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