The authors of this book - Lenin and Nobel Prize laureate Academician L.D. Landau and Professor A.I. Kitaygorodsky - in an accessible form set out the beginnings of a general course in physics. It is noteworthy that the questions of the atomic structure of matter, the theory of lunar tides, the theory of shock waves, the theory of liquid helium and other similar questions are presented together with the classical sections of mechanics and heat.