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Reprinted from 624543205 at 08:23 on May 2, 2010 Reading (loading. ..) Comments (0) Category: Personal Diary
physical quantity (units) of the deformation rate formula formula Note V (m / S) v = S: distance / t: time, gravity G (N) G = mg m: mass g: 9.8N/kg or 10N/kg density ρ (kg/m3) ρ = m / V m: Quality V: volume of joint force F (N) in the same direction: F co = F1 + F2 in the opposite direction: F co = F1-F2 in the opposite directions, F1> F2 buoyancy F float (N) F = G floating objects, as the G-G, as: an object F in the liquid gravity buoyancy float (N) F = G objects floating this formula applies only to floating or suspended objects floating buoyancy F (N) F = G floating row = m g = ρ fluid gV Pai Pai Pai G: m gravity of liquid arranged row: row to open the quality of the liquid fluid ρ: density of the liquid V row: row to open the volume of liquid (that is immersed in the liquid volume) leverage equilibrium F1L1 = F2L2 F1: Power L1: Power arm F2: Resistance L2: arm drag things fixed pulley F = G S = h F: pull the rope free end of the G materials are: the gravity of objects S: the distance to move the free end of the rope h: object rising from the movable pulley F = (G material + G round) S = 2 h G objects: objects of gravity G round: movable pulley gravity pulley F = (G material + G round) S = nhn: by moving pulley rope The number of segments mechanical work W (J) W = Fs F: force of s: to move in the direction of the force with a total distance of useful work W total power W = G W are the total property h W = Fs for pulley mechanical efficiency during upright η = × 100% power P (w) P = W: power t: time pressure p (Pa) P = F: Pressure S: area of the liquid pressure force p (Pa) P = ρgh ρ: density of the liquid h: depth of (from surface to the point of the vertical distance requirements) heat Q (J) Q = cm △ tc: the specific heat of material m: Quality △ t: change in value of the fuel combustion temperature, the heat released Q (J) Q = mq m : Quality q: heat value of common formulas and important points the physical one. Physics formula unit) formula Remarks formula deformation series circuit current I (A) I = I1 = I2 = ... ... current equal everywhere in series circuit voltage U (V) U = U1 + U2 + ... ... series circuit from the partial pressure of the role of series circuit resistance R (Ω) R = R1 + R2 + ... ... parallel circuit current I (A) I = I1 + I2 + ... ... a current equal to distributors and current of each branch of the (shunt) parallel circuit voltage U (V) U = U1 = U2 = ... ... parallel circuit resistance R (Ω) = + + ... ... Ohm's Law I = current in the circuit and the voltage proportional to the resistance is inversely proportional to the current definition of Type I = Q: charge (Coulomb) t: Time (S) electric power W (J) W = UIt = Pt U: voltage I: current t: time P: electrical power electrical power P = UI = I2R = U2/RU: Voltage I: Current R: resistance of electromagnetic wave velocity and wavelength, the relationship between frequency of C = λν C: physical unit name symbol name symbol formula mass m kg kg m = pv temperature t ° C ° C speed v m / s m / sv = s / t p density kg / m ? kg / m? p = m / v force (gravity) F Newton (cattle) NG = mg pressure P Pascal (Pa) Pa P = F / S work W joules (coke) JW = Fs power P watts (W) w P = W / t current of I amps ( An) AI = U / R voltage U V (V) VU = IR resistance of R ohms (EU) R = U / I electric power W J (coke) JW = UIt electric power P watts (W) w P = W / t = UI Joule heat Q (coke) JQ = cm (tt °) specific heat c J / (kg ° C) J / (kg ° C) vacuum speed of light 3 × 108 m / sec g 9.8 N / kg of 15 ° C in air Velocity 340 meters / second compilation of high school physics formula】 【mechanical part 1, speed: V = S / t 2, gravity: G = mg 3, density: ρ = m / V 4, pressure: p = F / S 5, the liquid pressure: p = ρgh 6, buoyancy: (1), F float = F'-F (pressure difference) (2), F float = G-F (as gravity) (3), F float = G (floating, suspended ) (4), Archimedes: F = G floating row = ρ fluid gV row 7, the levers equilibrium condition: F1 L1 = F2 L2 8, the ideal slope: F / G = h / L 9, the ideal pulley: F = G / n 10, the actual wheel: F = (G + G action) / n (vertical) 11, power: W = FS = Gh (the objects held high) 12, power: P = W / t = FV 13, the principle of work: W Hand = W machine 14, the actual machine: W total = W a + W additional 15, mechanical efficiency: η = W a / W the total 16, pulley efficiency: (1), η = G / nF (vertical direction) (2), η = G / (G + G action) (the vertical direction excluding friction) (3), η = f / nF (horizontal) 【thermal part of the】 1, heat: Q smoking = Cm (t- t0) = CmΔt 2, heat: Q release = Cm (t0-t) = CmΔt 3, calorific value: q = Q / m 4, stove and heat efficiency: η = Q effective use of / Q fuel 5, the heat balance equation : Q release = Q absorption 6, thermodynamic temperature: T = t +273 K Electricity Part】 1, current intensity: I = Q power / t 2, Resistance: R = ρL / S 3, Ohm's Law: I = U / R 4 , Joule's law: (1), Q = I2Rt universal formula) (2), Q = UIt = Pt = UQ power = U2t / R (pure resistance formula) 5, the series circuit: (1), I = I1 = I2 (2), U = U1 + U2 (3), R = R1 + R2 (4), U1/U2 = R1/R2 (partial pressure of the formula) (5), P1/P2 = R1/R2 6,
pandora jewelry, parallel circuit: (1) I = I1 + I2 (2), U = U1 = U2 (3), 1 / R = 1/R1 +1 / R2 [R = R1R2 / (R1 + R2)] (4), I1/I2 = R2/R1 (shunt formula) ( 5), P1/P2 = R2/R1 7 constant resistance: (1), I1/I2 = U1/U2 (2), P1/P2 = I12/I22 (3), P1/P2 = U12/U22 8 power Power: (1), W = UIt = Pt = UQ (universal formula) (2), W = I2Rt = U2t / R (pure resistance formula) 9 electric power: (1), P = W / t = UI (S & P appropriate formula) (2), P = I2R = U2 / R (pure resistance formula) used physical】 【1, the speed of light: C = 3 × 108m / s (vacuum) 2, sound velocity: V = 340m / s (15 ℃ ) 3, the human ear distinguish Echo: ≥ 0.1s 4, the acceleration of gravity: g = 9.8N/kg ≈ 10N/kg 5, the standard atmospheric pressure: 760 mm of mercury column height = 1.01 × 105Pa 6, the density of water : ρ = 1.0 × 103kg/m3 7, the water's freezing point: 0 ℃ 8, the water's boiling point: 100 ℃ 9, the water heat capacity: C = 4.2 × 103J / (kg ? ℃) 10, per charge: e = 1.6 × 10-19C 11, a battery voltage: 1.5V 12, a lead-acid battery voltage: 2V 13, the body's safe voltage: ≤ 36V (not higher than 36V) 14, power circuit voltage : 380V 15, the family circuit voltage: 220V 16, unit conversion: (1), 1m / s = 3.6km / h (2), 1g/cm3 = 103kg/m3 (3), 1kw ? h = 3.6 × 106J
Collection of high school physics formula quantities (units) of the deformation rate formula formula Note V (m / S) v = S: distance / t: time, gravity G (N) G = mg m : Quality g: 9.8N/kg or 10N/kg density ρ (kg/m3) ρ = m / vm: Quality V: volume of joint force F (N) in the same direction: F co = F1 + F2 in the opposite direction: F co = the opposite direction of F1-F2, F1> F2 F buoyancy float (N) F = G floating objects, as the G-G, as: an object F in the liquid gravity buoyancy float (N) F = G objects floating this formula applies only to objects floating or F suspension buoyancy float (N) F = G floating row = m g = ρ fluid gV Pai Pai Pai G: m gravity of liquid arranged row: row to open the quality of the liquid fluid ρ: density of the liquid V row: row of open liquid volume (the volume of the immersion liquid) equilibrium leverage F1L1 = F2L2 F1: Power L1: Power arm F2: Resistance L2: arm drag things fixed pulley F = G S = h F: pull the rope free end of the G materials are: objects of gravity S: rope free end of the moving distance h: object rising from the movable pulley F = (G material + G wheels) / 2 S = 2 h G objects: objects of gravity G round: movable pulley gravity pulley F = ( G objects + G round) S = nhn: by moving pulley rope segments mechanical work W (J) W = Fs F: force s: in the direction of the force to move the distance of useful work W a = G material h total power W Total W Total = Fs for pulley mechanical efficiency during upright with η = W / W × 100% of total power P (w) P = w / t W: power t: time pressure p (Pa) P = F / s F: pressure S: area of the liquid pressure force p (Pa) P = ρgh ρ: density of the liquid h: depth (from surface to the point of the vertical distance requirements) heat Q (J) Q = cm △ tc: m specific heat capacity of substances : Quality △ t: changes in value of the fuel combustion temperature heat released Q (J) Q = mq m: Quality q: heat value of the common formula and important points the physical one. Physics formula (units) formula Remarks formula deformation series circuit current I (A) I = I1 = I2 = ... ... current equal everywhere in series circuit voltage U (V) U = U1 + U2 + ... ... series circuit from the partial pressure of the role of series circuit Resistance R (Ω) R = R1 + R2 + ... ... parallel circuit current I (A) I = I1 + I2 + ... ... a current equal to distributors and current of each branch of the (shunt) parallel circuit voltage U (V) U = U1 = U2 = ... ... parallel circuit resistance R (Ω) 1 / R = 1/R1 +1 / R2 + ... ... Ohm's law I = U / I circuit current and voltage proportional to the resistance is inversely proportional to the current definition of Type I = Q / t Q: charge (Coulomb) t: Time (S) electric power W (J) W = UIt = Pt U: voltage I: current t: time P: electrical power electrical power P = UI = I2R = U2/RU: Voltage I: Current R: resistance of electromagnetic wave velocity and wavelength, the relationship between frequency of C = λν C: velocity (the velocity of electromagnetic waves is constant, equal to 3 × 108m / s) λ: wavelength ν: frequency of a few values need to remember : a. The propagation of sound in air speed: 340m/sb light in a vacuum or air velocity: 3 × 108m/sc. The density of water: 1.0 × 103kg/m3 d. Specific heat capacity of water: 4.2 × 103J / (kg ? ℃) e. A battery voltage: 1.5V f. Home circuit voltage: 220V g. Safe voltage: no more than 36V
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