中考物理知识总结(国外英文资料).docVIP

中考物理知识总结(国外英文资料) Physics review data for middle school entrance examination in 2014 Junior physics knowledge: constants 1. light (electromagnetic wave) travels fastest in vacuum, c=3 * 105Km/s=3 * 108m /s. Light travels more slowly in other transparent materials than in air 2.15 degrees of air speed of sound: 340m/s, vibration, sound, sound transmission needs medium, sound can not spread in vacuum. Sound travels most rapidly in solids, followed by liquids and slowest in gases. 3. water density: 1 * 103Kg/m3=1g/cm3=1.0Kg/dm3. The boiling point of water at 1 Standard atmospheres: 100 degrees C, and the melting point of ice is O DEG c, The specific heat of water is 4.2 * 103J/ (Kg DEG C). 4.g=9.8N/Kg, 10 N/Kg for special instructions 5. a standard atmospheric pressure =76cmHg==760mmHg=1.01 * 105Pa=10.3m high water column. 6. several voltage values: 1 section of dry cell 1.5V, one lead battery 2V. Lighting circuit voltage 220V, safety voltage is not higher than 36V. 7.1 kwh =1 kWh (KWH) =3.6 * 106J. 8. common small power appliances: electric lamp, TV, refrigerator, electric fan; Common high power appliances: air conditioner, induction cooker, rice cooker, microwave oven, electric iron. Junior physics knowledge: an international unit of physical quantity The length (L or s): m (m) time (T): second (s) area (S): 2 meters (M2) volume (V): 3 meters (M3) speed (V): M / S (m/s) temperature (t degrees Celsius (c): (this is) common unit) quality (m): kg (Kg) density (P): 3 kg / M (Kg/m3). Force (F): Newton (N) power (energy, electric power, electricity) (W) (J): Joule power (power) (P): Watt (W) pressure (P): Pascal (Pa) mechanical efficiency (ETA) heat (electric) (Q) (J: J) specific heat (c): MJ / kg (J/Kg degrees C) calorific value (q) or J/m3:J/kg (I): Ampere current (A) voltage (U): V (V) (R): ohmic resistance (Q). Physics knowledge in junior high school: physics formula Speed of 1. v=s/t; 2. =m/v density; P GH 3. pressure P=F/s=; 4. row F=G = P buoyancy liquid gV =G (suspe