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Unformatted text preview: Lab 127 Torque, Inertia and Rotational Kinetic Energy November 13, 2010 Mario DeLaPaz Kui Chen Phys 111A Objective : Part I. To determine the rotational inertia of rotating bodies I by measuring their angular acceleration a and compare this measurement with the rotational inertia computed from physical measurements. Part II. To compute the energy loss of the system and compare the mechanical energy of the system at two points in time. Theoretical Background = F*r 1 Rotational inertia : I = mr 2 Newtons Law of rotation : net = I Rotational energy (kinetic) : K r = I 2 Procedure First take the physical measurements of the disk and, using the formula of Inertia I = MR 2 , compute the rotational energy of the steel disk. Be sure to use SI units for the rotational inertia. The bottom disc will be stationary on the base plate while the top steel disc will float on the lower one. It is the latter disc, which will be the rotationally accelerated mass. The torque is applied by means of a string, which is which will be the rotationally accelerated mass....
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