Answer the following questions:
1. Explain how the convection currents arise as a result of variations in density of liquids and gases with temperature.
2. State some of the practical applications of relative density.
3. Explain the variation of density in solids, liquids and gases due to the change in temperature.
4. What are the factors that affect the time period of a pendulum?
5. A car moving on a crowded road is an example of non-uniform motion. Explain.
Answers
1) ans) The convection currents tend to move a fluid or gas particles from one place to another. These are created as a result of the differences occurring within the densities and temperature of a specific gas or a fluid. ... Due to this temperature difference, the hot fluids tend to rise, whereas cold fluids tend to sink.
2) ans). Following are the uses of relative density:
It is used for determining the density of unknown substance from the known density of another substance.
It is used by geologist to find out the mineral content into the rock.
Testing purity of a substance (example gold).
3) ans). The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. ... This causes it to rise relative to more dense unheated material.
4) ans). The only things that affect the period of a simple pendulum are its length and the acceleration due to gravity. The period is completely independent of other factors, such as mass.
5) ans). a car driven on any city road is an example of non-uniform motion because city roads are usually full of traffic and you have to apply brakes,change the speed and even wait for the traffic signals so as the definition says when a body does not covers equal distance in equal interval of time it is known as non-uniform .
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