Progress Sums: 1,2,3,4,5..., -1,-2,-3,-4,-5... It can be found using the formula: Sn=(n²a₁+n)/2. Progress Sum: 1,3,6,10,15..., -1,-3,-6,-10,-15... It can be found using the formula: Sn= ((n+a₁)³-(n+a₁))/6. Progress Sum: 1,4,9,16,25..., -1,-4,-9,-16,-25... It can be found using the formula: Sn= a₁(n+a₁)(n²a₁+0.5n)/3. (Where n - is the number of summable terms, a₁ - is the first term of the progression).

The main property of the neutral zone of a permanent magnet is the presence of a directional force of motion (magnetic self-motion) with a pronounced attraction, in relation to any main pole of another magnet. When the magnetic field of the neutral zone moves parallel to the magnetization axis of the permanent magnet along the plane of the conducting circuit - an electric current arises.

Collision of gas molecules is the source of energy. We assemble a simple galvanic cell (analogous to the well-known battery). We place two electrodes with a potential difference in a NaCl solution. With a fixed load of the external circuit, we discharge the cell. Without breaking the external circuit, we cover the galvanic cell with a glass flask. In the mixture of atmospheric air located under the flask, we increase the percentage of carbon dioxide several times by introducing carbon dioxide under the flask. We record the restoration of the cell charge.