HW-Ch8 - HW-CH89th Edition CH8 Problems: 20, 40, 84, 1078th...

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Unformatted text preview: HW-CH89th Edition CH8 Problems: 20, 40, 84, 1078th Edition CH8 Problems: 26, 38, 70, 7720.A pendulum consists of a 2.0 kg stone swinging on a 4.0 m string of negligi-ble mass. The stone has a speed of 8.0 m/s when it passes its lowest point.(a) What is the speed when the string is at 60oto the vertical? (b) Whatis the greatest angle with the vertical that the string will reach during thestone’s motion? (c) If the potential energy of the pendulum-Earth systemis taken to be zero at the stone’s lowest point, what is the total mechanicalenergy of the system?40.The potential energy of a diatomic molecule (a two-atom system likeH2orO2) is given byU=Ar12&Br6;whereris the separation of the two atoms of the molecule and A and Bare positive constants. This potential energy is associated with the forcethat binds the two atoms together. (a) Find theequilibrium separation{that is, the distance between the atoms at which the force on each atomis zero. Is the force repulsive (the atoms are pushed apart) or attractiveis zero....
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This note was uploaded on 05/14/2011 for the course ECON 101 taught by Professor Asdaf during the Spring '11 term at Universidad de San Buenaventura Bogota.

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