The drive wheel of the motorcycle is driven by a chain drive. The radius of the wheel is equal to R, the radius of the drive gear is equal to r. Determine the useful engine power if it is known that the motorcycle is moving at speed v, and the tension of the upper and lower sections of the chain are equal to F1 and F2. Perform a numerical calculation for R = 30 cm, r = 6 cm, v = 72 km/h, F2 - F1 = 500 k.

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