Explanation
The presence of impurities either on the liquid surface or dissolved in it considerably affect the force of surface tension depending upon the degree of surface tension depending upon the degree of contamination. A highly soluable substance like sodium chioride when dissolved in water increase the surface tension. But the sparing soluable or substance like phenol when dissolved in water reduces the surface tension of water.
When a drop of Liquid is poured on a glass, plate, the shape of the drop also is governed the force of gravity for every small drops the potential energy due to gravity is insignification. Compared to that due to surface tention. Hence, in this case the shape of the drop is determined by sufrace tension alone and drope becomes spherical.
Initially on heating temprature rises from -100C to 00 C Then ice melt and temprature does not rise After the whole ice has melted temprature begins to rise until reaches 1000 C Then it becomes constant as at the boiling point will not rise.
As the both points are al the surface of liquid and these points are in the open atmosphere. So, both point possess similar pressure and equal to 1 atm. Hence, the pressure difference will be zero.
When we move from centre to circumference, the velocity of liquid goes on decreasing and finally becomes zero.
When cross-section of duct is decreased, the velocity of water increased and in accordance with Bernoulli’s theorem, the pressure P decreased at that place.
When the height h2 is decreased further upward force on the block will also decrease while downward force will remain same. Thus, block will be in contact with the wall of tank.
A torque is acting on the wall of the dam trying to make it topple. The bottom is made very broad so that the dam will be stable.
A stream lined body has less resistence due to air.
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