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A disk with moment of inertia I1 rotates about a frictionless vertical axle with angular speed wi. A second disk, this one having moment of inertia I2 and initially not rotating, drops onto the first disk. Because of friction between the surfaces, the two eventually reach the same angular speed wf.
(a) calculate wf.
(b) calculate the ratio of the final to the initial rotational energy?
Traditional slingshots of old were made from camel hair and are, on average, about 80 cm in length. How long would it take to reach this speed
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A 30-g silver teaspoon at room temperature 200C is placed into 200 g of hot tea 1000C. No heat escapes the spoon-tea system. You assume that the specic heat of tea is the same as that of water.
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A lady is pulling her luggage that has a mass of 24 kg. What is the total power exerted on the luggage by the lady
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