Question

Give reasons for the following statements-

(a) School bags are provided with wide straps to carry them

(b) Mountaineers may suffer from nose bleeding at high altitudes.

(c) Airplanes have pressurized cabins for passengers safety while flying high in the atmosphere.​

Answer 1

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a) It Divides the force along All Shoulder.

b) Because of Lack Of atmosphere And air.

c) Because to maintain pressure in plane.

Answer 2

(a) Schools bags are provided with wide straps. On carrying them on our shoulders, the area under these straps enlarges, exerting a small pressure. It is due to this small pressure we feel comfortable carrying our bags on our shoulders.

(b) Nosebleeds can be caused by being up in a very high altitude. As you climb higher, the amount of oxygen in the air decreases. This makes the air thinner and dryer, which can in turn cause the inside of your nose to crack and bleed.

(c) Airplanes are pressurized because the air is very thin at the altitude they fly. The average passenger jet has a cruising altitude of about 30,000 to 40,000 feet. At this altitude humans can’t breathe very well and our body gets less oxygen. This is called hypoxia and can cause slower thinking, dimmed vision, and death. Another effect of a depressurized cabin can be “the bends.” This is the same thing scuba divers can get if they resurface too quickly. A dramatic drop in pressure can cause excess nitrogen to come out of the blood stream as gas bubbles. This can result in joint pain, paralysis, and death. To prevent all of these complications, the cabins of many aircraft are pressurized to near sea level pressure, which makes breathing in an airplane about the same as breathing at sea level.

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