I have the answer for (a) 960 N/m 2 but I chose to leave it just in case it may

Question

I have the answer for (a) 960 N/m2 but I chose to leave it just in case it may help for part (b)

I'm thinking (b) is pretty simple, I know P=F/A and F=mg so I would be looking for m using m=PA/g, but I don't know what to use for the area. I know the force would only be applyed to the top part, and that area would be A=?r2, but the pressure I have (960 N/m2) is supposed to be the same all around the surface of the siringe and not just at the top. I thought of using the surface area, but still, the mass would only apply a force on A=?r2. What should I do?

Please tell me if my reasoning is wrong, and work out the problem regardless of if my thinking is right or wrong in order to get the points.

Let's first consider one air bubble underwater (therefore, there is only one surface associated with the bubble). Assume that the pressure outside of the bubble is 1 atm. What is the difference between the inside pressure and the outside pressure? The tension coefficient of airwater interface is known as gamma = 7.2 times 10-2 N/m.

Explanation / Answer

your reason is right

F = P*A

m*g = P*A

m = P*A/g

= 960*pi*0.15^2*10^-6/9.8

= 6.924*10^-6 kg

= 6.924 milli gram

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