Air has mass, why does it not fal1 down due to gravity? the pressure from below

Question

Air has mass, why does it not fal1 down due to gravity? the pressure from below gives a force equal and opposite to the weight The pressure from above gives a force equal and opposite to the weight The pressure from below gives a force equal and opposite to the combination of the weight and the force from the pressure from above The pressure above a lake is 101300Pa. The density of water is 1000kg/m^3, what is the pressure 1 m below the surface? 9810Pa 101300 - 98lOPa 101300 + 9810Pa None of the above

Explanation / Answer

9. Ans(C)

10. Using bernoulli's equation,

P + rho*g*H + rho*v^2/2 = constant

here using P + rho * g * h = constant for at surface and 1mbelow.

101300 + (1000 * 9.81 * 1) = P + (1000 * 9.81 * 0)

P = 101300 + 9810 = 111110 Pa

Ans(C)

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