QI. Answer in one word: -
1. Write the relationship between thrust, area and Pressure.
2. What happens to atmospheric pressure as we move towards the higher altitude?
3. Give one application of low pressure.
4. The pressure exerted by a given liquid increases with
Q II. Answer in brief: -
5. Define atmospheric pressure. Give one application of atmosphere Pressure.
6. Why Potters place a round piece of cloth on their heads when they carry heavy loads?
7. An elephant is standing on its four feet, exerting a force of 20000 Newton. The of four legs is 0.5-meter square. Calculate the pressure exerted by it on the surface.
Answers
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1)Both Thrust and Pressure are directly proportional to each other and derived the formula pressure is obtain by perpendicular force and area. They are practically same and thrust is defined as force acting perpendicular each other and divided by the unit area while pressure is applying by force.
2)pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.So, as we go up at higher altitude the pressure decreases.
3)A vacuum cleaner has a fan inside that creates a low pressure inside the device. Consequently, air and dirt particles are sucked into the device.
4)The pressure exerted by a liquid increases with increasing depth inside the liquid. The pressure exerted by a liquid is small just under the surface of the liquid.
5)That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. ... One atmosphere is 1,013 millibars, or 760 millimeters (29.92 inches) of mercury. Atmospheric pressure drops as altitude increases
Straw : When a man sucks up the fluid from straw the pressure inside is moderately low and accordingly atmospheric pressure outside powers up the fluid into straw.
6)Porters place a thick , round piece of cloth on their head when carry they have loads to increase the area of contact of the load with their head. Since the load now falls on a larger area of head, the pressure on head is reduced and it becomes easier to carry the heavy load.
7)force extered = 20,000 N
Area = 0.5 meters square
hence, force extered = F/A = (20,000/0.5) = PA = 40000 pa