ch07.problems
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CH07.Problems. JH.131. Position velocity acceleration force 2 times & position displacement Force & displacement work V= -10 t, a= -10, F= -10*5=-50 N; Xi= 10, Xf = 10-5*16, d = -80 m W = F . D = 4 000 J. K =1/2 m V^2, doubling V makes V^2 4 times higher, Vi Vf =2 Vi - PowerPoint PPT PresentationTRANSCRIPT
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CH07.Problems
JH.131
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• Position velocity acceleration force• 2 times & position displacement• Force & displacement work
• V= -10 t, a= -10, F= -10*5=-50 N;• Xi= 10, Xf= 10-5*16, d = -80 m• W = F . D = 4 000 J
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K =1/2 m V^2, doubling V makes V^2 4 times higher, Vi Vf=2 ViThus Ki Kf= 4 Ki
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Ws = ½ k (Xi^2 - Xf^2)
Or
Fs = -k X and Ws = - Fs * x Negative of the integral
Take two triangles: ½ 8 * (-80) + ½ (-4) * 40 = -240 N cm = - 2.4 JThen W = - integral =+2.4J
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