Задача 40929.

The period of small vertical oscillation ball suspended on a light spring in the air is equal to 1s. When submerged ball in a viscous liquid during its oscillation increased by 20%. Find the coefficient of damping of oscillations.

Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.