In present paper the following effects in nonlinear oscillator with final dissipation are studied: stochastic resonance, stochastic synchronization and noise-induced chaos. It is shown that stochastic resonance and stochastic synchronization at final dissipation have the same regularities as in the case of overdamped oscillator but are observed at a lower noise level. Equivalent characteristics of potential profile are introduced on the basis of numerically obtained Kramers frequency dependence on noise intensity that allow to apply to considered model the analytical relations, obtained for a overdamped oscillator. It is found that noise-induced transition to chaos in the oscillator with final dissipation can not influence on the stochastic resonance and stochastic synchronization as it is observed in other region of parameter values.

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