3-2 review knowledge points and formulas

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• 1. Knowledge points and related formulas of gravitation and spaceflight in senior high school physics
• 2. What is the difference between Q in I = q / T and Q in I = (qnsvt) / T What do Q and Q stand for
• 3. In the microscopic expression of current: I = NESV, s refers to the cross-sectional area. In the definition formula: I = q / T, it is said that it has nothing to do with the cross-sectional area. What is the reason?
• 4. The total energy released in the internal and external circuits is determined by () A. Electromotive force of power supply B. current through power supply C. terminal voltage D. sum of internal and external resistance
• 5. In a complete circuit, if a section of wire has no resistance, that is, no voltage, then from the micro point of view, in the circuit, the electrons moving along the direction of the electric field form a current, and the voltage of that section of wire depends on the work done by the electrostatic force. With the change of electric potential energy, as long as the electrons move in a directional direction, there must be voltage. Isn't that contradictory?
• 6. The storage ring of Beijing Electron Positron Collider (BEPC) is an approximate circular orbit with a circumference of 240m. When the current generated by electrons flowing at the speed of 110% of the speed of light is 10mA, the number of electrons running in the ring is (known speed of light C = 3 × 108 & nbsp; m / s, electronic charge e = 1.6 × 10-19 & nbsp; c) () A. 5×1010B. 5×1011C. 1×102D. 1×104
• 7. Why does the voltage at both ends of option D decrease? My analysis is: in Figure B, if the resistance is R and the total resistance is ignored, it is R / 3. Compared with figure B, the resistance in Figure C is 3R / 2 and the resistance increases, so the total current decreases, the voltage in the power supply decreases, the terminal voltage increases, ur1 decreases, and the voltages of R2 and D increase and are equal
• 8. Senior high school physics compulsory 1 Chapter 2 Formula Please, as long as the second chapter of the formula, with some explanation, thank you
• 9. What is the formula of the first section of compulsory Physics 1 in senior high school? Just in high school, I was very busy, so I didn't pay much attention to physics. Who gave me all the formulas? I'm really in a hurry now. The first chapter was pulled down. Thank you. It's better to write down the meaning of each letter. Thank you. There's a reward Thank you!
• 10. All the formulas of physics compulsory one in Senior High School
• 11. The expressions of the two basic equations for the magnetic field of a steady current in vacuum are
• 12. All formulas of magnetic field
• 13. Solution: sine alternating current effective value Emax = root 2E effective, integral derivation process
• 14. Proving the relationship between the effective value and the peak value of the sinusoidal alternating current by integration Such as the title
• 15. Maximum and effective value of alternating current (sine) The derivation of the relationship between maximum and effective value
• 16. How to get the image effective value of sine alternating current Is the maximum divided by the root 2 half cycle or one cycle?
• 17. On the homeostasis expression of alternating current When to use EM = coswt, when to use EM = sinwt?
• 18. On the formula of alternating current What is the meaning of sin ω t in the formula of alternating current e = e (m) sin ω t? Is it sin ω * t or sin ω t?
• 19. Derivation of several effective value calculation formulas of alternating current Sinusoidal alternating current U = um / √ 2, Sinusoidal half wave alternating current U = um / 2, Sinusoidal unidirectional pulsating current U = um / √ 2, Rectangular pulsating current U = √ (T / T) um, Asymmetric alternating current √ (1 / 2 * (U1 ^ 2 + U2 ^ 2))
• 20. How is the maximum value of alternating current EM = NBS ω derived?