Submarine is cruising through the ocean at a depth of 50m. Submarine goes

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EinsteinInTraining

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into an area of freshwater. It will:? A. Keep going as if nothing happened
B. Start to rise because of the change in density
C. Start to sink because of the change in density
D. Be crushed by the change in density
 
It will start sinking as the fresh water is less dense than the ocean water.

the answer is C
 
I'm sure that you don't care about the reasoning for the answer, but just in case you do... Archimedes principle states that the buoyant force of water is equal to the weight of the water displaced by the object in the water. Since salt water is more dense than fresh water, the moment the submarine crosses over from salt water to fresh water, the buoyant force decreases so the sub will sink. Answer is (c).
 
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