Atmosphere exerts enormous pressure to our body but we do not feel it, why?

The mercury level decreases in the barometer as the altitude increases. Why?

A girl with high-heeled shoes makes much more depression on the sand than an elephant. Why?

All cutting instruments have the sharp edges. Why?

Find the density of an object if its mass is 8000 kg and volume is 1000 m^{3}.

A liquid exerts the pressure of 5000 pascals at the bottom of the vessel. If the depth of the liquid is 2 m, find its density.

The dimension of a certain tank is 3m × 2m × 2m. What is the pressure at the bottom of the tank if the tank is half filled? (Given, the density of water = 1000 kg/m^{3} and g = 10 m/s^{2})

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