Using (t) and (-) sign.
and solved it.
from
a surface othe of the sea, a submarine
deep below
50 m. towards bottom of the sea . so after half an
hours. how many kilometre
distance cross by a
Submarine
Ans
two how many
Answers
Answer:
Imagine you’re hanging out with your friends on a Friday night, when your good friend Jacques texts you and asks you to join him on a trip to the bottom of the ocean. Jacques has a brand new submarine that he’s been itching to try out, and he wants you to come with him to check out some hydrothermal vents at the bottom of the Marianas Trench that he’s been talking about for weeks.
You don your itchiest wetsuit and climb aboard his submarine, which has suspiciously thick iron walls given how tiny and cramped it is inside. Jacques reminds you that the super-thick walls are necessary in order to survive the descent to the bottom of the Trench, since the external pressure down there is nearly 1000 times what you’re used to at sea level. The stiff walls hold the pressure inside constant even while the pressure outside increases. The walls themselves actually get compressed due to the gradually-increasing difference in pressure across them. The reason that they don’t collapse onto you and Jacques is that they compress (like springs), which counter balances the force arising from the pressure difference. So as the submarine dives deeper, the internal pressure (thankfully) stays the same… but the walls actually get thinner!
Figure of submarine walls compressing during descent
Figure of submarine walls compressing during descent
Recall that, at sea-level, you experience a pressure of about 101 kPa due to the weight of the Earth’s entire atmosphere sitting on top of you. Because air is not very dense this pressure only barely varies with elevation. For example, at the top of the Empire State Building the pressure is roughly 95 kPa. It’s only at colossal distances that the change in pressure becomes noticeable. At the top of Mount Everest the pressure is closer to 33 kPa. The decrease in pressure occurs simply because as you go higher there is less air above you pushing down on you.