Solution of task 20.4.9 from the collection of Kepe OE
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20.4.9
The cargo 2 is attached to the rod 1 and moves in a vertical plane. The potential energy of the pendulum is P = 9.81 (1 - cosφ), the kinetic energy is T = 0.8φ2. Determine the kinetic potential at the time when the angle φ = 60 ° and the angular velocity φ = 1 rad / s. (Answer -4.11)