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Physics 1A, Section 2

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Physics 1A, Section 2. October 28, 2010. Quiz Problem 49. Quiz Problem 49. Answer: {[k 3 + (k 1 -1 + k 2 -1 ) -1 ] -1 + k 4 -1 ] -1. Energy Conservation. Energy is conserved: K + U + heat + … = constant Sometimes, mechanical energy is conserved: - PowerPoint PPT Presentation

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Page 1: Physics 1A, Section 2

Page 2: Physics 1A, Section 2

Page 3: Physics 1A, Section 2

• Answer:

a)

b)

c) {[k3 + (k1-1 + k2

-1)-1]-1 + k4-1]-1

Page 4: Physics 1A, Section 2

Page 5: Physics 1A, Section 2

Page 6: Physics 1A, Section 2

Page 7: Physics 1A, Section 2

Page 8: Physics 1A, Section 2

• Answer:

• v = sqrt(2gh)

• F = -kx – mg, to the right

• W = -kxs2/2 – mgxs

• Wf = 2mgxs

• h’ = h – 2xs

• xs = [-mg + sqrt(2m2g2+2kmgh)]/k

Page 9: Physics 1A, Section 2

Monday, November 1:

• something to do with potential energy

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