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# HW_7 - P112 Spring 2008 Homework#7 Reading 6.5 7.2-7.5...

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P112 Spring 2008 Homework #7 Reading: 6.5, 7.2-7.5, 8.1-8.3 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. A force of 800 N stretches a certain spring a distance of 0.200 m. a) What is the potential energy of the spring when it is stretched 0.200 m? b) What is its potential energy when it is compressed 5.00 cm? 2. Consider the graph of the potential energy of a nucleus. a) are there any points of stable, unstable or neutral equilibrium? b) Where is the force maximum in magnitude? c) Where is the force attractive? Where is it repulsive? d) Draw a graph of the force F versus position r e) If the proton has kinetic energy of 1.0 fJ when far away (r>>10 fm), how close could it get to r=0? f) If the proton is inside the nucleus (r<2fm) with a kinetic energy of 1.0 fJ, how much more kinetic energy would it need to escape? g) How much kinetic energy would it then have when it gets far away (r>>10 fm) 3. A 2.00-kg package is released on a 53.1 0 incline, (see Fig.7.43 in the book), 4.00 m from a long spring

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HW_7 - P112 Spring 2008 Homework#7 Reading 6.5 7.2-7.5...

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