P2207_fall10_lecture18 - 0.5 m B. 1 m C. 1.5 m D. 2 m E....

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R h Lecture 18
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Today: Potential energy diagrams Stable and unstable equilibrium Oscillations, simple harmonic motion
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A mass m is connected to a rigid massless rod of length L . The mass is released from the vertical as shown. What is its speed v at the bottom of its motion? m +y L v = ? A. gL B. (gL) 1/2 C. (2gL) 1/2 D. (4gL) 1/2
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A block , initially at rest, slides down a frictionless slide. At the bottom of the slide the block comes to a stop in a distance d=1m on a surface with friction ( k =0.5 ). What is the height h of the slide? h = ? A.
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Unformatted text preview: 0.5 m B. 1 m C. 1.5 m D. 2 m E. Not sure h=? friction frictionless d=1m A block of mass m is dropped from a height h onto a spring with spring constant k , as shown. If the spring compresses a maximum distance y , from what height h was the block dropped ? m h y k h = ? A. k y /mg B. k( y) 2 / 2mg C. k( y) 2 / 2mg - y D. Not sure U(x) x 1 J Consider the potential energy curve U(x) shown below: Stable equilibrium? Unstable equilibrium? 1. E=0 J : Turning points? 2. E=1 J : Turning points?...
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P2207_fall10_lecture18 - 0.5 m B. 1 m C. 1.5 m D. 2 m E....

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