hw 17 sol

# hw 17 sol - Patel(pnp223 homework 17 Turner(92160 This...

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Patel (pnp223) – homework 17 – Turner – (92160) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points Use the potential energy vs . position plot shown below to answer the Following two ques- tions. x U ( x ) Z Y V Which oF the points represented in the di- agram above correspond to equilibrium posi- tion(s)? 1. Point V only. 2. Points Z and V only. 3. Point Z only. 4. Points Z and Y only. 5. Point Y only. 6. Points Y and V only. 7. Points Z , Y and V . correct Explanation: The equilibrium positions are positions at which the net Force on the object is zero. The Force on the object is just the slope oF the potential energy plot. One can see that the slope is zero at points Z , Y and V . 002 (part 2 oF 2) 10.0 points Which oF the points represented in the dia- gram above correspond to stable equilibrium position(s)? 1. Points Z , Y and V . 2. Points Z and V only. correct 3. Point Y only. 4. Point Z only. 5. Points Y and V only. 6. Point V only. 7. Points Z and Y only. Explanation: Stable equilibrium positions are Found at the local minima oF the potential energy plot. One can see that the energy minima Fall at points Z and V . Point Y is an unstable equilibrium point. 003 (part 1 oF 3) 10.0 points Two objects are connected by a light string passing over a light Frictionless pulley as shown in the fgure. The 6 . 2 kg object is released From rest at a point 5 . 36 m above the ±oor. The acceleration oF gravity is 9 . 8 m / s 2 . 5 . 36 m ω 6 . 2 kg 2 . 37 kg ²ind the speed oF each object just as they pass each other.

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hw 17 sol - Patel(pnp223 homework 17 Turner(92160 This...

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