V. Answer in brief.
1 on what factors the pressure exerted by the
liquid depends on?
2. Why does a helium balloon float in air?
3. Why it is easy to swim in river water than in
sea water?
4. What is meant by atmospheric pressure?
5. State Pascal's law.
Answers
Answer:
1. Pressure within a liquid depends only on the density of the liquid, the acceleration due to gravity, and the depth within the liquid. The pressure exerted by such a static liquid increases linearly with increasing depth.
2. Helium balloons also work by the law of buoyancy. ... The helium balloon displaces an amount of air (just like the empty bottle displaces an amount of water). As long as the weight of the helium plus the balloon fabric is lighter than the air it displaces, the balloon will float in the air.
3. It is because sea water contains more amount of salt as compared to river/fresh water as a result its density increases and hence the buoyant force increases which makes it easier to swim in sea water.
4. atmospheric pressure. [ ăt′mə-sfîr′ĭk ] The pressure at any location on the Earth, caused by the weight of the column of air above it. At sea level, atmospheric pressure has an average value of one atmosphere and gradually decreases as altitude increases. Also called barometric pressure.
5.Pascal's law states that the pressure exerted anywhere in a confined incompressible liquid is transmitted equally in all directions irrespective of the area on which it acts and it always acts at right angles to the surface of containing vessel.