High school physics can only be used to find the formula of uniform variable speed linear motion
Motion of projectile
Uniform circular motion
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- 2. What is the derivation formula of sinusoidal AC RMS? Such as the title
- 3. Elementary mathematical derivation method of sinusoidal alternating current RMS
- 4. Why is the RMS of sinusoidal alternating current equal to twice the root of the peak?
- 5. I don't know if it's right that I use calculus to deduce the effective value of sine alternating current I use calculus to deduce the voltage and current RMS of sinusoidal alternating current. I don't know if the process is correct
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- 7. The frequency of a sinusoidal alternating current is 50 Hz, the effective value is 5 A, and the initial phase is - II / 2 I hope the answer is more detailed
- 8. The instantaneous value expression of a sinusoidal AC voltage is u = ten times root sign two sin314tv, and the effective value of its voltage is?
- 9. It is known that the effective value of AC voltage is 220 V and the frequency is 50 Hz. When t = 0, the instantaneous value is 110 V, then the expression of the instantaneous value of the voltage is given
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- 11. The useful corollary vt2-vo2 = 2As is derived? Is the formula vs / 22 = (VO2 + vt2) / 2 also derived?
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- 18. 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
- 19. 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
- 20. 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?