The motion of a small disc, constrained to lie on a perfectly smooth horizontal table, is analysed by rotating observers. The differential equations, involving both Coriolis and centrifugal accelerations, are completely solved for some specific boundary conditions. Interesting paths are obtained compared with the straight line followed in the inertial frame.
The normalization of the gluon condensate and of renormalon-related power corrections in QCD is computed under the assumption that their "perturbative" part dominates over any eventual extra contribution from the non-trivial vacuum. The calculation is performed in the infrared finite coupling framework, assuming an infrared fixed point is present in the perturbative coupling down to low values of N f . The freezing perturbative coupling is reconstructed using a Banks-Zaks expansion approach. Parameter-free predictions of the low energy moments of the coupling, which determine the process-independent part of the power corrections, are obtained for a number of choices of the running coupling.
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