Question

the surface area of the upper surface of a submarine is 200m square. if the submarine is 70m below water calculate total force on its surface
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Answer 1

Answer:

Surface area (A) of upper surface= 200 m2

Pressure due to air=  x  x g = 0.75m x 13600 kg m-3 x 10 ms-2 = 1,02,000 Pa.

Pressure due to sea water only= x  x g = 70m x 1040 kg m-3 x 10 ms-2

                                          = 7,28,000 Pa.

Therefore, total pressure (P) acting on the surface of submarine= ( 7,28,000 + 1,02,000) = 8,30,000Pa.

Total force acting on the submarine= P x A = 83000 x 200

                                                  = 166,000,000 N.

Explanation:

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