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Anonymous users2024-02-06You're so lazy.
Go flip through the books yourself.
You can review your knowledge.
You can find the formula again.
If you want to learn well, be diligent.
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Anonymous users2024-02-051. The velocity formula of uniform linear motion:
Find velocity: v=s t
Find the distance: s=vt
2. The speed formula of variable speed linear motion: v=s t
3. The relationship between the weight and mass of an object: g=mg
g = 4, the definition of density.
Find the density of a substance: =m v
Find the mass of the substance: m = v
Find the volume of the substance: v=m
4. Calculation of pressure.
Definition: p=f s (the substance can be applied in any state) liquid pressure: p= gh (h is the depth).
Find the pressure: f=ps
Find the force area: s=f p
5. Calculation of buoyancy.
Weighing method: f float = g—f
Formula method: f float = g row = v row g
Floatation method: F float = g object (v row v object).
Suspension method: F float = g matter (V row = V matter).
6. Leverage balance condition: f1l1=f2l2
7. Definition of work: w=fs
8. Power definition: p=w t
For the case of uniform linear motion: p=fv
f is power) 9, mechanical efficiency: =w useful w total.
For lifting objects:
w useful = gh (h is the height).
W total = FS10, bevel formula: FL = gh
11. Endothermic and exothermic conditions when the temperature of the object changes.
Q aspiration = cmδt
t=t-t0）
Q amp = cmδt
t=t0-t）
12. Calculation of the heat emitted by fuel combustion: q discharge = qm
13. Thermal equilibrium equation: q suction = q discharge.
14. Heat engine efficiency: =w useful
q put. q-amp=qm).
15. Current definition: i=q t
q is the amount of electricity, and the unit is coulombs.
16. Ohm's law: i = u r
Deformation voltage: U=IR
Deformation resistance: r=u i
17. The characteristics of the series circuit: (taking the series connection of two pure resistive electrical appliances as an example) the relationship between voltage: U=U1+U2
Relationship of current: i=i1=i2
Relation of resistance: r=r1+r2
18. Characteristics of parallel circuits: (taking the parallel connection of two pure resistive electrical appliances as an example) the relationship between voltage: u=u1=u2
Relationship of current: i=i1=i2
The relationship of resistance: 1 r = 1 r1 + 1 r2
19. Calculation of electric work: w=uit
20. The definition of electric power: p=w t
Common formula: p=ui
21. Joule's law: q amp = i2rt
For purely resistive circuits: q amp = i2rt
u2t/r=uit=pt=uq=w
22. Calculation of the total power of the lighting circuit: p=p1+p1+......
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Anonymous users2024-02-04Hope it helps.
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Anonymous users2024-02-031. Physical properties of matter.
1.Mass of the object.
Define units and conversions.
Measuring Tools Pallet balances (construction, use).
Definitions, Units, Formulas.
2.Density of a substance Measurement of density (solid, liquid).
Application of density knowledge.
3.Specific heat capacity of a substance (definition, application).
4.Other physical properties of matter: hardness, state, transparency, heat transfer, electrical conductivity.
2. Mass is a physical property of an object, independent of shape, state, position.
3. Special methods for mass measurement: accumulation method (more is less) (1) Different objects composed of the same substance have the same ratio of mass to volume.
2) Objects composed of different substances have different ratios of mass to volume.
4. Density: The mass of a substance per unit volume.
1 Unit of density:
Kilogram m3 (kg m3), gram centimeter3 (g cm3) 1g cm3 = 10 3 kg m3
2 Formula: = m v
3 The density of some substances.
1) Density of water: kg m3
Expression: The mass of 1 cubic meter of water is kg
2) Copper, iron, aluminum.
3) Salt water, water, alcohol.
4 Density measurement.
1) Different substances of the same mass absorb different amounts of heat when they are raised to the same temperature.
2) Different substances of the same mass absorb the same heat and raise different temperatures.
5. Specific heat capacity: the amount of heat absorbed (released) by the increase (decrease) of the temperature of a certain object per unit mass1.
1 Definition: c=q m(t-t0).
2 units: joules (kg) j kg ) reads as: joules per kilogram of degrees Celsius.
3 Specific heat capacity of water: j kg).
Representation: The temperature of water with a mass of 1 kg rises 1 The amount of heat absorbed is.
You look at the encyclopedia and the library, which has it.
Counterclockwise, Ray, Jane. Love hopes that you are most precious.
Feelings can't be forced, in fact, I think you should analyze the main problem of your breakup at that time, why wait, mainly depends on you, do you think your relationship is worth keeping, do you want to keep, or whether it is necessary to keep. If you feel that you still care about the relationship between you, you can try to change it, make up for the mistakes of the past together, let go of the stones in your heart, and feel the good times you used to have again. If you feel that he doesn't care about the relationship anymore and doesn't matter in your heart anymore, then don't force it too much.
1. Regular keyboard shortcuts.
button purpose. >>>More
Title: Songs from a Secret Garden.
The first album released by the world-famous band Secret Garden, Songs from a Secret Garden >>>More