- Need Help With Classical Mechanics 1 (38.08 KiB) Viewed 21 times
need help with classical mechanics
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answerhappygod
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need help with classical mechanics
need help with classical mechanics
4.4** A particle of mass m is moving on a frictionless horizontal table and is attached to a massless string, whose other end passes through a hole in the table, where I am holding it. Initially the particle is moving in a circle of radius r, with angular velocity 0), but I now pull the string down through the hole until a length r remains between the hole and the particle. (a) What is the particle's angular velocity now? (b) Assuming that I pull the string so slowly that we can approximate the particle's path by a 1 AN P (a) (b) Figure 4.24 (a) Problem 4.2. (b) Problem 4.3 Problems for Chapter 4 151 circle of slowly shrinking radius, calculate the work I did pulling the string. (c) Compare your answer to part (b) with the particle's gain in kinetic energy.
4.4** A particle of mass m is moving on a frictionless horizontal table and is attached to a massless string, whose other end passes through a hole in the table, where I am holding it. Initially the particle is moving in a circle of radius r, with angular velocity 0), but I now pull the string down through the hole until a length r remains between the hole and the particle. (a) What is the particle's angular velocity now? (b) Assuming that I pull the string so slowly that we can approximate the particle's path by a 1 AN P (a) (b) Figure 4.24 (a) Problem 4.2. (b) Problem 4.3 Problems for Chapter 4 151 circle of slowly shrinking radius, calculate the work I did pulling the string. (c) Compare your answer to part (b) with the particle's gain in kinetic energy.
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