A top has a rotational inertial of 0.0035 kgm2 and is spinning at a frequency of 68 rpm. Determine the rotational kinetic energy of the top. Express your answer in mJ.
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A top has a rotational inertial of 0.0035 kgm2 and is spinning at a frequency of 68 rpm. Determine the rotational kinetic energy of the top. Express your answer in mJ.
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- A pulley with an unknown mass has a 0.3m radius that is initially at rest. The rotational inertia of the pulley is 0.35 mr^2. A 10 kg box hangs from a rope that is wrapped around the pulley that is also initially at rest. The box accelerates downward a distance of 10m and reaches a velocity of 8 m/s. Calculate the mass of the pulley. Answers must use the correct SI units.A propeller is modeled as five identical uniform rods extending radially from its axis. The length and mass of each rod are 0.829 m and 2.71 kg, respectively. When the propellor rotates at 589 rpm (revolutions per minute), what is its rotational kinetic energy ??A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric cars. The gasoline burned in a 270-mile trip in a typical midsize car produces about 1.64 x 109 J of energy. How fast would a 11.4-kg flywheel with a radius of 0.238 m have to rotate to store this much energy? Give your answer in rev/min.
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