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A puck on a frictionless air hockey table has a mass of 0.500 kg and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance of ri = 2.00 m from the hole with an angular speed of ?i = 3.00 rad/s. The cord is then pulled from below, shortening the radius to rf =1.00 m. What is the new angular velocity of the puck? {Hint: use conservation of angular momentum}
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On a vacation flight, you look out the window of the jet and wonder about the forces exerted on the window.
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If a 68.3 kg person were travelling at 0.960c (where c is the speed of light), what would be the ratio of the person's actual kinetic energy to the person's classical kinetic energy
A current of 23.0 mA is maintained in a single circular loop of 3.80 m circumference. Calculate the magnetic moment of the loop
calculate the fraction of energy lost in the resistor in the charging RC circuit. By integrating the power dissipated in the resistor and applying energy conservation between t=0 and t= infinity.
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A pencil is held perpendicular to the optical axis of a concave spherical mirror. The pencil is 85 cm from the center of the mirror, What is the magnification of the pencil's image
q1. the temperature of the glass surface of a 30 w light bulb is 75degc when the room temperature is 10degc. estimate
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