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Q1. A 750 gram grinding wheel 25.0 cm in diameter is in the shape of a uniform solid disk. (We can overlook the small hole at the center). When it is in use, it turns at a consant 220 rpm about an axle perpendicular to its face through its center. As the power switch is turned off, you observe that the wheel stops in 45.0 s with constant angular acceleration due to friction at the axle. What torque does friction exert even as this wheel is slowing down?
Q2. With what tension should a rope with length 3.00m and mass 0.135kg be stretched for transverse waves of frequency 43.0Hz to have a wavelength of 0.720m?
Calculate the period T and the tension in the string F as a function of the angle. Compute the moment of inertia of this system for an axis that passes through the combined center of mass and is perpendicular to the plane of the rings.
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The pilot of the spaceship measures the length of the moving ship as 30 meters. Establish its length as measured by a person on earth.
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