Turntable Table Tennis
Glass is in the axis of rotation of platinum. The table will slide into a rolling friction ..?
Glass is in the axis of rotation of platinum. The table will slide into a rolling friction, y = 8.0 x 10 ^ -4 kg-m ^ 2 for the combination of table glass. The water flows slowly in the glass Precipitate on the axle. If the container is rotated at 2 revolutions per minute when it is empty, what is its speed when it contains 300 g of water? The inner radius is 3.5 cm.
Go too easy! The revolution speed is so slow that we can consider that the free surface is formed flat. You can check: z <w ^ 2 r ^ 2 / 2 g = w, 209 rad / s, r = 0.035m, g = z = height of the parabola 9.8m/s2 <0.3 mm – that is not worth considering. So now I just have to conserve energy. Calculate the kinetic energy of rotation before adding water, the calculation of the polar moment of inertia after adding water, and then calculate the new speed. Years. 1.8 rpm much more interesting now is that if you start the table at 270 rpm. Now the free surface makes the difference (241rpm vs 243.5 rpm) Work It Out!
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