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EXERCISES  AND PROBLEMS ssm Solution is in the Student Solutions Manual. www Solution is available on the World Wide Web at: http://www.wiley.comlcollege/hrw Ilw Solution is available on the Interactive LeamingWare Impulse and Linear Momentum 1A cue stick strikes a stationary pool ball. with an average force 50 N over a time of 10 ms. If the […]

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REVIEW & SUMMARY Collisions In a collision, two bodies exert strong forces on each other for a relatively short time. These forces are internal to the two-body system and are significantly larger than any external force during the collision. Impulse and Linear Momentum Applying Newton’s second law in momentum form to a particle-like body involved in a collision leads to […]

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Sample Problem Two skaters collide and embrace, in a completely inelastic collision. Thus, they stick  together after as suggested. (a) What is the velocity V of the couple after they collide? SOLUTION: One Key Idea here is the assumption that the two skaters form a closed, isolated system. (b) What is the velocity  of the center of […]

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Collisions in Two Dimensions When two bodies collide, the impulses of one on the other determine the directions in which they then travel. In particular, when the collision is not head on the  bodies do’ not end up traveling along their initial axis. For such two dimensional collisions in a closed, isolated system, the total linear momentum must […]

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Sample Problem Two metal spheres, suspended by vertical cords, initially just touch, as shown in . Sphere  with mass m, = 30 g, is pulled to the left to height hI· = 8.0 em, and then released from rest. After swinging down, it undergoes an elastic collision with sphere 2, whose mass 2 = 75 g. What is the […]

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Moving Target Now that we have examined the elastic collision of a projectile and a stationary target, let us examine the situation in which both bodies are moving before they undergo an elastic collision. Note that the assignment of subscripts 1 and 2 to the bodies is arbitrary. If we exchange those subscripts in, we end up with the […]

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Elastic Collisions in One Dimension As we discussed , everyday collisions are inelastic but we can approximate some of them as being elastic; that is, we can approximate that the total kinetic energy of the colliding bodies is conserved and is not transferred to other forms of energy. 1. Equal masses which we might call a pool player’s result. It […]

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Sample Problem A karate expert strikes downward with his fist (of mass ml 0.70 kg), breaking a 0.14 kg board . He then does the same to a 3.2 kg concrete block. (a) Just before the object (board or block) breaks, what is the energy stored in it? SOLUTION: The Key Idea here is that we can treat […]

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Sample Problem The ballistic pendulum was used to measure the speeds of bullets before electronic timing devices were developed. The version shown in Fig. 10-11 consists of a large block of wood of mass M = 5.4 kg, hanging from two long cords. A bullet of mass m = 9.5 g is fired into the block, coming quickly to […]

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Velocity of Center Of Mass A closed, isolated system, the velocity of the center of mass of the system cannot be changed by a collision because, with the system isolated, there is no net external force to change it. To get an expression for v;,om, let us return to the two body system and one-dimensional collision. Shows, in a […]