Solving a problem in physics, section 62, point 74 wave

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74. The oscillation circuit includes a capacitor C = 20 nF, coil inductance L = 0,15 Mr and resistance R = 5,0 Ohm. The circuit supports sustained oscillations at the natural frequency. The amplitude of the voltage across the capacitor Um = 4,0 V. Determine the average power w, consumption of the circuit.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)