Why does Archimedes principle f float = g row I understand the derivation process of the formula. Don't tell the story of the crown
Can be verified from the experiment, first you can use the weighing method to measure the buoyancy of submerged objects in the water, and then weigh out the gravity of the discharged water, and then compare the secondary values
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- 1. 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!
- 2. 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?
- 3. 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!)
- 4. 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)
- 5. A = four fifths × B = C × seventy-five percent = e / two thirds = D / three fifths. Arrange a, B, C, D, e from small to large
- 6. The value range of function y = (4-cos ^ x-3sinx) / (2-sinx)
- 7. 3,3,8,8 addition, subtraction, multiplication and division equals 24 The more the better, 3Q
- 8. A quadratic polynomial about X, when x = 1, the value of the polynomial is - 1. What is the sum of the coefficients of this polynomial?
- 9. How many square feet is one square meter
- 10. It is known that a, B, C and D are rational numbers, where the positions of a, B, C and D on the number axis are shown in the figure, and the value of | A-B | - 2 | B-C | + | C + D | a. The distance of b.c.d is uncertain, which is probably the case. The number axis can't draw b d 0 C a Please hurry up!! Thank you!
- 11. 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~
- 12. How to understand Archimedes principle
- 13. What is full circuit? And mathematical expression of Ohm's law
- 14. The mathematical expression of Ohm's law is______ The units of the three physical quantities I, u and R in the formula are______ 、______ 、______ .
- 15. What is the mathematical expression of Ohm's law of the whole circuit?
- 16. The expression of Ohm's law in AC circuit is?
- 17. 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
- 18. 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
- 19. 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)
- 20. What are the common formulas of the law of conservation of mechanical energy?