The expression of Ohm's law in AC circuit is?

If it is pure resistance, the expression is the same, r = u / I, but here u and I are functions of time and change with time

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1. What is the mathematical expression of Ohm's law of the whole circuit?
2. The mathematical expression of Ohm's law is______ The units of the three physical quantities I, u and R in the formula are______ 、______ 、______ ．
3. What is full circuit? And mathematical expression of Ohm's law
4. How to understand Archimedes principle
5. The usage of five laws of Archimedes' principle on F floating When will f-float = g-row be used? F floating = ρ liquid GV discharge when to use? When is f float = f lower surface - f upper surface = f2-f1 row used? F-float = G-F when to use? When is f-float = g-row used? Help me make it clear If there are any other formulas, let's be clear~
6. Why does Archimedes principle f float = g row I understand the derivation process of the formula. Don't tell the story of the crown
7. Archimedes' principle can be expressed by the formula F floating = P liquid GV. What is v discharge liquid? Detailed point! A question a question answer!
8. On the physical problems of Archimedes principle There is a metal ball hanging at the lower end of the spring dynamometer. The indication of the spring dynamometer is 10N. If half of the metal ball is immersed in water, the indication of the spring dynamometer is 8N. If the metal ball is completely immersed in water, what is the indication of the spring dynamometer?
9. Archimedes principle problem g row = f float = m row g right, so m row and so on are not equal to the mass of the object put in? There is a question: put a 10 cm long solid cube gently into a beaker full of water (here I ask the first question, is it completely submerged?). When the wood block is still, 600 g of water will overflow from the beaker (the second question is as our teacher said: F floating = g row = m row, g = ρ liquid (here the liquid is water) GV row, then = 1 × 10 & # 179; kg / M & # 179; 8 N / kg × 1000 × 10 ^ - 6 is equal to 9.8 N, but it can be calculated with m row g = 0.6 kg × 9.8 N / kg = 5.88 n. who can tell me how this is all the same? The density of water is the same. The volume of water discharged is the same. The first one is 1.0 × 10 & # 179; × 1000 × 10 ^ - 6 = 1 kg. The second one is 600 g = 0.6 n. why is it different!)
10. The calculation of rational number in junior high school 1）23-17-｛-7｝+｛-16｝（2）（+24）+（-14）+（-16）+（+8）（3）2/3-1/8-（-1/3）+（-3/8）（4）（41）+（-23）+（-34）+0 (5)1/2+（-2/3）-（-4/5）-（-1/2）
11. Summary of Liberal Arts Physics in senior high school (concept + formula) Because it is a liberal arts, so test concept more The relative calculation is less Just draw a conclusion according to the formula But my foundation is very weak I can't sum it up
12. In the experiment of using free falling body method to verify the law of conservation of mechanical energy, the formula for calculating the velocity of the nth point is
13. Law of conservation of physical and mechanical energy In the following motions, the mechanical energy conserved is () 1. An object moving at a constant speed on a smooth horizontal plane 2. An object moving in a circular motion at a uniform speed 3. An object that slides along a smooth slope 4. Throwing a moving object horizontally (please write down why it is right and why it is wrong)
14. What are the common formulas of the law of conservation of mechanical energy?
15. What is the reason for the small air resistance when a dense object falls (in the experiment to verify the law of conservation of mechanical energy)?
16. Please use Newton's law and kinematics related knowledge to obtain the law of conservation of mechanical energy through theoretical derivation
17. The condition of the law of conservation of mechanical energy A piece of wood slides down a smooth slope. Because only gravity does work, the mechanical energy of the piece is conserved If the inclined plane is not smooth and the block is subject to friction, and a force F is applied to the block in the opposite direction and equal to the friction force, then can the mechanical energy of the block be considered to be conserved?
18. What is the main content of the law of conservation of mechanical energy in senior one
19. What is the content of the law of conservation of mechanical energy
20. The content of the law of conservation of mechanical energy