4. Give reasons for the following.
(a) people often encounter problems like nose bleeding when they reach high altitude.
(b) A boys weighs only 10 kg on the moon, while his weight on the earth is 60kg.
(c)Womens are advised not to wear high-heeled shoes.
(d) Divers have to wear special suits before diving into a deep sea.
(e) We do not feel air pressure although there is a tall column of air above us.
Answers
Answer:
a)At high altitudes, there is very less oxygen. This makes the air drier. As a result the climate of our nose also gets drier along with the air, this makes the blood vessels exposed in your nose to explode and hence at higher altitudes, people often encounter problems like nose bleeding.
b)this is because of gravitational force, gravitational pull on earth is more than that of on moon, the gravitation on moon is 0.16g and the gravitation on earth is 1g. so, anything that weighs on earth will weigh much lighter when on moon.
c)Answer: when the women wear the heels know the posture of their legs may cause much the front portion to stress more. there would be more pain in all the joints of the foot.
d)The pressure exerted by water deep under the sea is much greater than at the sea level. Hence, the deep sea divers wear special suits which protect them from extreme pressure of water. These suits contain buoyancy compensators to combat the weight of their diving equipment and the pressure of water at great depths.
e)The reason we don't feel air pressure although there is a tall column of air above us is because the blood pressure of our body counterbalances the air pressure which is 1 atm at sea level.
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