Hai quả cầu kim loại có bán kính r bằng nhau và bằng 2,5 cm đặt cách nhau 1 m, điện thế của các quả cầu lần lượt là 1200 V và -1200 V. Tính điện tích của mỗi quả cầu.

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Which of the following is the result of the nuclear weak force? the instability of large nuclei the repelling force between positively charged protons the structure of the atom certain types of nuclear decay

Convection occurs when thermal energy is transferred by the movement of