3. Give reasons for the following statements-
(a) 'Snow shoes' are more effective than ordinary shoes for walking on
snow.
(b) Porters place a large round piece of cloth on their heads when they
carry heavy loads.
(c) A sharp knife cuts vegetables and fruits more effectively than a blunt
knife.
(d) School bags are provided with wide straps to carry them.
(e) It is much easier to burst an inflated balloon with a needle than
(directly) with the finger.
(f) Mountaineers may suffer from nose bleeding at high altitudes.
(g) Airplanes have pressurised cabins for passenger safety while flying high
in the atmosphere.
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Give reasons for the following
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Answers
here is my answer...
Explanation:
All of the above situation have same reason pressure increases due to the surface area..
We wear snow shoes rather than normal shoes because snow shoe's base is wider which helps to walk in soft snow
school bags r produced with large straps because if we have thin straps the weight will be expressed on our shoulder whereas wide straps balances the weight
Answer:
1.Snow shoes with spikes are more effective for walking on snow than ordinary shoes because they create more friction as compared to ordinary one which is necessary for walking on a slippery surface as snow.
2.The round piece of cloth on their heads increases the area on which the force (weight of the load) will act. We know that, the pressure is inversely proportional to area. Therefore, increase in area reduces the pressure and this helps the porter to carry the heavy load easily.
3.➡️When the surface area is lesser, the sharp knife can easily cut through the fruit or vegetable making it easy to cut. A sharp knife cuts vegetables and fruits more efficiently than a blunt knife. ... Sharp knife exerts more pressure than a blunt one.
4.So That the area of contact increase and pressure will be lower...
5.Pressure depends upon applied force and Area on which the force act.
Pressure depends upon applied force and Area on which the force act.one needle has very small surface area therefore more pressure be applied on the inflated balloon than the finger and therefore it is much easier to burst inflated balloon with a needle than finger.
6.As the altitude increases the atmospheric pressure decrease. And the air becomes thinner and there will be very less oxygen at high altitude. So due to which the blood vessels present inside our their nose bursts and starts bleeding. This is why mountaineers suffer from nose bleeding!
7.To avoid such kind of problems, airplanes have pressurized cabins. To maintain the air pressure inside the cabin, compreesed air is generally bled off from the engines. This air is very hot, about 250 degree celcius. ... The cabin altitude of a typical commercial aircaft is 6000 to 8000 feet, while flying at 36000 feet.
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