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# HW #7 - homework 07 FONTENOT BRIAN Due Mar 3 2008 4:00 am...

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homework 07 – FONTENOT, BRIAN – Due: Mar 3 2008, 4:00 am 1 Question 1, chap 8, sect 1. part 1 of 3 10 points A 3 kg block collides with a massless spring of spring constant 94 N / m attached to a wall. The speed of the block was observed to be 1 . 3 m / s at the moment of collision. The acceleration of gravity is 9 . 8 m / s 2 . How far does the spring compress if the sur- face on which the mass moves is frictionless? Answer in units of cm. Question 2, chap 8, sect 1. part 2 of 3 10 points The maximum distance to which the spring was compressed was observed to be 13 . 9345 cm. What is the kinetic coe±cient of friction between the block and the ²oor? Question 3, chap 8, sect 1. part 3 of 3 10 points Given: The coe±cient of static friction be- tween the ²oor and the block is 0 . 594033. Does the block remain at rest or does it bounce back o³ the spring once the spring is fully compressed? 1. cannot be determined 2. bounces back 3. stays at rest Question 4, chap 8, sect 2. part 1 of 2 10 points A bead slides without friction around a loop-the-loop. The bead is released from a height h from the bottom of the loop-the-loop which has a radius r . h r Which of the following diagrams best rep- resents the kinetic energy of the bead versus time? 1. t K 2. t K 3. t K 4. t K 5. t K

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homework 07 – FONTENOT, BRIAN – Due: Mar 3 2008, 4:00 am 2 6. t K Question 5, chap 8, sect 2. part 2 of 2 10 points Which of the following could represent the gravitational potential energy of the bead ver- sus time? 1. t U 2. t U 3. t U 4. t U 5. t U 6. t U Question 6, chap 8, sect 2. part 1 of 1 10 points Use the potential energy vs . position plot shown below to answer the following question. A particle is released from point A and moves in the potential U ( x ). Suppose the mechanical energy of the system is conserved. x U ( x ) V T Y A At which position(s) will the kinetic energy of the particle have its maximum value? 1.
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HW #7 - homework 07 FONTENOT BRIAN Due Mar 3 2008 4:00 am...

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