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Q1. Consider a motor that exerts the constant torque of 25.0 N cdot m to a horizontal platform whose moment of inertia is 50.0 kg cdot m^2. Imagine that the platform is firstly at rest and the torque is applied for 12.0 rotations. Neglect friction. What is the rotational kinetic energy of the platform K_rot,f at the end of the procedure described above?
Q2. On a very muddy football field, a 100 linebacker tackles a 75 halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.9 north's and the halfback is sliding with a velocity of 7.9 east's.
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A 28.0 {rm kg} child plays on a swing having support ropes that are 2.20 {rm m} long. A friend pulls her back until the ropes are 45.0^circ from the vertical and releases her from rest.
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