八年级暑假答案语文,物理（Eighth grade summer vacation answer language, physics）.doc

八年级暑假答案语文,物理（Eighth grade summer vacation answer language, physics） One, practice one Increase water alcohol 0.29 1.93 g/cm3 gold left right 34.4 * 10 ^ 3 1 a cubic meters of the quality of the copper content of 8.9 * 10 ^ 3 kg little big 0alcohol water 2:1 4.00 balanced nut right 78.2 DACAACCA Balance - V1 V2 V1 m/V2 Two thin strands of copper and iron are attached to a beaker with water, and the liquid level is iron The volume of water quality air density/volume 52 mark 20 2.6 * 10 ^ 3 2. Do it (1) find out the quality of soap from the soap box. (2) fill the bowl with water and put it in an empty bowl. Gently place the soap in the water in the bowl and soak it in the water, then use the soup bowl to catch the spilled water. (3) fill the bottle with the overflow with a funnel and read the volume of water. (4) the density of soap is rho = m/V Analysis: (1) not equal (2) due to pour all the water in the bowl cant do, also on the funnel to touch some of the water, so the measurement of small water volume V, quality m is accurate, according to the formula of rho = m/V, the measured density will be larger. Small fat is wrong Three, check 1. The same volume of iron is heavier than cotton 2. The gap between wires. 3. A little Four, think about it /testdetail/7104/ 5. Read The volume of an object varies with the temperature Exercise 2 One, practice one Nucleus can be divided up great big no no 4.73 * 10 ^ 2 * 12 10 ^ 7 there is a gap between molecular attraction between molecules The molecules are doing the unruleless movement silk negative charge to do the unrulable movement in the unoccupied places smoking electrons, atoms, organisms, earth, solar system slightly There is an attractive attraction between the molecules and there is a gap between the molecules that have no rules CCBCBCC ACD 2. Do it There is a gap between the air and the carbon dioxide in the glass below the glass Three, check One light year = 9.4605284 * 10 ^ 15 meters 1 astronomical unit = 149,