23物理(国外英文资料).doc

23物理(国外英文资料) The theory of knowledge compilation of middle school physics A physical quantity: 1, current: I - A, 2 - ampere voltage: U - V - V 3, resistance: R ohm - Omega 4, (electric) power (electricity): W - J - Joule 5, (electric) power: P - Watt - W, 6 - J - Q: Joule heating 7, quality: m - kg - Kg 8, volume: V - m3 cubic meters 9, density: P - Kg/m3 - 10 kilograms per cubic metre, gravity: G - Newton - N 11, pressure: P - Pascal - Pa 12, pressure: F - Newton - N 13, the force area: S square meters, 14 square meters, V meters per second speed: m/s 15, distance: s meters - 16, M - S - time: T seconds 17, buoyancy: F floating - Newton - N 18, efficiency: ETA - no unit 19, the wavelength lambda - M - 20: m, frequency: F - Hertz - Hz 21, T - S - second cycle: Two, the formula 1, current: I=U/R, voltage: U=IR 2 3, 4, resistance: R=U/I power: W=UIt=I2Rt=U2t/R=Pt 5, 6: P=UI=I2R=U2/R=W/t, electric power: Q=I2Rt (Q=W) 7, density: P =m/V 8, quality: m= P V 9, volume: V=m/ P 10, speed: v=s/t 11, s=vt: 12, journey time: t=s/v 13, G=mg: 14, solid gravity pressure: p=F/S 15, liquid pressure: p= P GH 16, F: =G -F float buoyancy pull liquid row gV =G = P (suspended or floating) =F up -F down 17, power: W=FS power: P=W/t=Fv, 18 19, efficiency: /W 20, ETA =W total heat: Q=cm t=mq=Vq The relationship between the 21, wavelength, wave velocity, frequency, cycle: v= x f= x /T Three, unit conversion 1, current: 1mA=103A 1 A=10 ~ 6 A 2, voltage: 1KV=103V 1MV=106V 3, density: 1g/cm3=103Kg/m3 4, volume: 1L=1dm3=103m3 1mL=1cm3=106 M3 5, quality: 1t=103Kg 1g=10 3Kg 1mg=106 kg 6, size: 1cm2=104m2 1mm2=106m2 1dm2=10-2m2 7, length: 1m=10dm=100cm=103mm=106 m=109nm 8, time: 1h=60min=3600s 9, speed: 1m/s=3.6km/h 1km/h= (1/3.6) m/s 10, power: 1Kw h=1 =3.6 * 106J? Four, constant 1, g=9.8N/Kg=10N/Kg 2, the speed of light (electromagnetic wave) (in vacuum): c=3 * 108m/s 3, speed of sound (in the air): V=340m/s 4 yuan charge: e=1.6 * 1019C 5, the density of water: water =1.0 103kg/m3 * P 6, 1 stand