On the construction site for a new skyscraper, a uniform beam of steel is suspen

Physics
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On the construction site for a new skyscraper, a uniform beam of steel is suspended from one end. If the beam swings back and forth with a period of 2.48 s, what is its length?

 m

Mar 31st, 2015


P=2.48s = 2 pi sqrt[1/3 ML^2/(Mg*L/2)] 
2.48s=2 pi sqrt[L^2/(3*g*L/2)] 
2.48s=2 pi sqrt[2L/3g] 

square both sides: 

6.1504=4 pi^2 (2L/3g)  

L=18.4512g/(8 pi^2)= 2.29m

Mar 31st, 2015

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