The ninth grade physics formula solution teacher teaches

Buoyancy Formula 1. F = g buoyancy F unit: Newton (n) weight of drained water g unit: Newton (n) 2. F = ρ gvliquid density: ρ unit: kilogram per cubic meter (kg / M & sup3;) gravity formula: G unit: Newton per kilogram (n / kg) volume of drained liquid: unit: V cubic meter (M & sup3

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8. The deformation formula of liquid pressure How to calculate the pressure, how to calculate other physical quantities according to the pressure, you have to give me
9. Liquid pressure formula P = f / S = g / S = mg / S = meat VG / S There is no problem, but the next step is p = f / S = g / S = mg / S = meat VG / S = meat SHSG / S = meat GH My question is: Meat VG / S = meat SHSG / S is also v = sh, in other words, this formula should only be used in regular container liquid pressure, in other words, if the liquid is in irregular container liquid (such as cone), it can not be used But the teacher said it was universal, Note: the so-called liquid pressure is only related to height and liquid density, which is derived from P = GH, so this definition can not be used to explain this formula If the secondary formula is correct, according to P = f / S = g / S = mg / S = meat VG / S = meat SHSG / S = meat GH, it can also be deduced that the pressure of solid is also related to height and density, in other words, it has nothing to do with volume and bottom area! According to you, it's liquid pressure: P = f / s But the solid pressure is also p = f / s In other words, as long as the formula is applicable to liquid pressure, it must also be applicable to solid pressure But the formula of fact doesn't work! Also, for example, put a piece of wood in a container with half a cup of water, and find out the pressure change of water on the bottom According to P = meat GH, we find that meat G is constant, h is larger and pressure is larger But according to P = f / S = g / S = mg / s, m, G and s are constant, so the pressure is constant The two contradict each other Ask for advice
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13. 1. A and B measure the length of the same object with two scales. The result measured by a is 6.50dm, and that measured by B is 0.648m A. The graduation value of the scale used by two people is the same. B. The graduation value of the scale used by two people is different. C. one of the two results must be wrong D. A's reading is more accurate than B's 2. When measuring the length of an object with a smaller scale, the measured value is compared with the real value () A. The measured value is greater than the real value B. the measured value is less than the real value C. the measured value is equal to the real value D. it cannot be judged 3. When we ring the ancient bell, we will find that after stopping the impact on the bell, the bell's "lingering sound" does not stop. The main reason is () A. The echo of the bell B. the big clock is still vibrating C. the big clock stops vibrating D. people's hearing is prolonged 4. What's the reason why people can speak? What's the reason why people can hear? 5. When playing guitar, the finger moves back and forth on the string to change the pitch by changing (). This research method uses the () method
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