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Q.

Ships and submarines mainly work on ______________.

Choose the correct option.

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a

Newton's first law of motion

b

Bernoulli's principle

c

Snell's law

d

Archimedes principle

answer is B.

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Detailed Solution

Ships and submarines work on the Archimedes principle.

  • According to Archimedes' principle, If a body is wholly or partially submerged in a fluid at rest it is acted upon by an upthrust buoyant force in the upward direction whose magnitude is equal to the weight of the fluid displaced by the body. It has the following applications-
    A submarine has a large ballast tank, which is used to control its position and depth from the surface of the sea. 
  • A submarine submerges by letting water into the ballast tank so that its weight becomes greater than the buoyant force. 
  • Conversely, it floats by reducing water in the ballast tank.-thus its weight is less than the buoyant force.
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