The surface energy of a liquid drop

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The surface energy of a liquid drop is u. It is sprayed into 1000 identical drops. What will be the total surface energy?

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A fast moving train cross a person standing near a railway track

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When a fast moving train cross a person standing near a railway track, the person has a tendency to fall towards the train. This is because

a) a gravitational force
b) of dizziness related to vestibular system dysfunction
c) vibrations of air created by the train
d) a fast moving train creates large velocity of air between the person and the train
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A yacht drops anchor

yacht

A yacht drops its anchor overboard. What happens to the water
level?

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A ball fell into a vessel

BallVessel A wooden ball fell into a high cylindrical vessel. The diameter of the vessel and the diameter of the ball is 5 cm and 4 cm respectively. Can you get the ball without touching the vessel?

 

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The stream of water.

faucet2Why does the stream of water flowing from a faucet often get more narrow as the water falls?

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What is the density of the material from which the object is made?

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In the vessel are two immiscible liquids with densities ρ1 and ρ2 and layers of thickness h1 and h2 respectively. From the surface of liquid is lowered a streamlined object which reaches the bottom right at the moment when its speed becomes zero. What is the density of the material from which the object is made?

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