The proposed fourth edition of the Collection differs significantly from all previous editions primarily in its volume, since the number of tasks included in the Collection has been almost doubled. The content was enriched and the level of tasks increased. According to the degree of difficulty, the statements and solutions of the problem cover a wide range: from the most elementary to the tasks that stand at the level of original scientific research, the implementation of which is possible on the basis of in-depth knowledge of the general course of physics.