Subject: Science, Topic: Density. Would you mind helping me answer question 6 from the pink box please? Please don't answer these "Measuring the density of a liquid". This is other than General Physics. If you can't find the answers, you may try to research. Thank you for your help.
13 DENSITY . PHYSICS Measuring the density of an irregularly shaped solid The density of an irregularly shaped solid, such as a pebble, can be found in the following way. The mass of the pebble is found by placing it on a top-pan balance, as for a solid of a regular shape. The volume is found by pouring water into a measuring 6 The mass of a pebble was cylinder until it is about half full. The volume of the water 38.4g. The original volume of is read on the scale and then the pebble is carefully water in the measuring cylinder lowered into the water on a thin string. When the pebble 00 was 50 cm' and the combined is completely immersed in the water, the volume of the volume of water and pebble water is read again on the scale. The volume of the pebble was 84 cms. What is the density is found by subtracting the first reading from the second. 250.009 of the rock in the pebble? The density of the pebble is found by dividing the mass of the pebble by its volume. Figure 13.4 Finding the mass of a measuring cylinder and the liquid t contains measuring cylinder Table 13.2 shows the densities of some liquids. 2nd reading Table 13.2 The densities of some liquids 1st reading Liquid Density/kg/m3 water mercury 3550 water at 4 .C 1000 _pebble corn oil 900 turpentine 860 Figure 13.3 Measuring the volume of a pebble paraffin oil 800 methylated spirits 790 Measuring the density of a liquid The density of a liquid is found in the following way. 1 A measuring cylinder is put on a balance and its mass Floating and sinking found (A). When a piece of wood is placed in water, the wood floats. 2 The liquid is poured into the measuring cylinder and its This is due to the difference in the densities of the wood and volume measured (). the water. From Tables 13.1 and 13.2 you can see that wood 3 The mass of the measuring cylinder and the liquid it is less dense than water. When two substances, such as a contains is found (B). solid and a liquid or a liquid and a liquid, are put together 4 The mass of the liquid is found by subtracting A from B. the less dense substance floats above the denser substance. 5 The density of the liquid is calculated by dividing the When full-fat milk is poured into a container, such as a mass of the liquid by its volume: Figure 13.5 Liquids of different densities bottle, the cream, which contains fat and is less dense than the more watery milk, rises to the top. density = B - A form layers when they are mixed V
