1, classical mechanics

(1) Solving the multi-degree-of-freedom motion problem of objects: In solving the multi-degree-of-freedom mechanical problems, the equations of motion can be solved by mathematical and physical methods, so as to determine their velocities and positions at various times.

(2) Solving the problem of orbital motion: In orbit, the state of an object is controlled by its momentum and energy, and its motion law can be solved by mathematical and physical methods, thus drawing the shape of the orbit.

2. Thermodynamics

(1) heat transfer problem: The changes of temperature field and energy field can be analyzed by mathematical and physical methods, and the temperature distribution of heat transfer can be solved, thus the temperature field of the grid shell can be obtained.

(2) Mass transfer: Due to the change of physical field in heat flow system, the physical field can be analyzed by mathematical and physical methods, so as to solve the flow distribution law of velocity field and concentration field in mass transfer problem.

3. electromagnetism

(1) electrostatic field problem: Because gravity, magnetic force and electrostatic field are often considered together in electromagnetism, the potential distribution on the surface of an object can be solved by mathematical and physical methods, so as to judge the properties of the surface of the object.

(2) The problem of rotating electromagnetic wave: The four directional fields of rotating electromagnetic wave can be solved by mathematical and physical methods, so as to analyze the change characteristics of waveform and decay acceleration.

4. Solid state physics

(1) lattice structure analysis: Mathematical and physical methods can determine the parameter relationship among ions, atoms and molecules in lattice structure, thus solving the properties of crystals in normal state.

(2) Analysis of electronic states: The energy levels of ions can be deduced by mathematical and physical methods, and the trajectories of electrons can be analyzed, so as to solve the different electronic states of crystals.

5, fluid mechanics

(1) Turbulence research: The distribution characteristics of velocity field and pressure field can be solved by mathematical and physical methods, so as to determine the distribution of fluid at the boundary.

(2) Acoustics research: The propagation characteristics of waves in fluid can be deduced by mathematical and physical methods, so as to analyze the effects of different sound fields.