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Ans me 65 and 64 b
class 8
Answers
HEY MATE HERE IS YOUR ANSWER--
Q) why human body not crushed by the pressure exerted by atmosphere ?
Human bodies are used to air pressure. The air pressure in our lungs, ears and stomachs is the same as the air pressure outside of our bodies, which ensures that we don't get crushed. Our bodies are also flexible enough to cope when the internal and external pressures aren't exactly the same.
Q) how does the pressure of liquid depend on its depth ??
Density of the liquid, and the acceleration due to gravity. For any given liquid with constant density throughout, pressure increases with increasing depth. this is how the pressure of liquid depends on its depth.
Q) why the walls of dam are thicker from bottom but not from top ?
The dam. You can see from the diagram that the dam is much thicker at the bottom than it is at the top. This is because the pressure of the water is much greater deeper down and the dam needs to be thick at the bottom so that it is strong enough to withstand this larger pressure.
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