The 12-lb disk A has a radius rA = 6 inches and an initial angular velocity ω0 = 750 rpm in a clockwise direction. The 30-lb disk B has a radius rB = 10 inches and is at rest. A force F of magnitude 5 lb is then applied to bring the discs into contact. If the coefficient of kinetic friction is ?? = 0.25 between the surfaces that are in contact between the two discs and the friction of the bearings on the shafts on which discs A and B rotate is ignored, determine: a) The magnitude y sense of angular acceleration of each disc just when contact between the discs begins. b) The magnitude and direction of the final angular velocity of each disc, assuming that at the end the discs roll without sliding against each other. Consider that the axes on which the discs A and B rotate are at the same level and that the horizontal bar on which the guide slides on which the force F is applied is smooth.
The 12-lb disk A has a radius rA = 6 inches and an initial angular velocity ω0 = 750 rpm in a clockwise direction. The 30-lb disk B has a radius rB = 10 inches and is at rest. A force F of magnitude 5 lb is then applied to bring the discs into contact. If the coefficient of kinetic friction is ?? = 0.25 between the surfaces that are in contact between the two discs and the friction of the bearings on the shafts on which discs A and B rotate is ignored, determine: a) The magnitude y sense of angular acceleration of each disc just when contact between the discs begins. b) The magnitude and direction of the final angular velocity of each disc, assuming that at the end the discs roll without sliding against each other. Consider that the axes on which the discs A and B rotate are at the same level and that the horizontal bar on which the guide slides on which the force F is applied is smooth.
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