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A full-term fetus typically has a mass of 3.50 $\mathrm{kg}$ . (a) What pressure does the weight of such a fetus create if it rests on the mother's bladder, supported on an area of 90.0 $\mathrm{cm}^{2} ?$(b) Convert this pressure to millimeters of mercury and determine if it alone is great enough to trigger the micturition reflex (it will add to any pressure already existing in the bladder).

(a) $p=3810 \mathrm{N} / \mathrm{m}^{2}$(b) $p=28.7 \mathrm{mm} \mathrm{Hg}$

Physics 101 Mechanics

Chapter 11

Fluid Statics

Fluid Mechanics

Rutgers, The State University of New Jersey

Simon Fraser University

Hope College

McMaster University

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We're told that a full term fetus typically has a mass of 3.5 kilograms, and we want to find out what pressure does. The weight of this such fetus creative rests on the mother's bladder, supported on an area of 90 square centimeters. So I've drawn here. Here's our fetus. Use the bladder. It's resting on the bladder. Obviously, there's the weight of the fetus acting the bladder and then, obviously the rest of the woman's body reacting till the platter in place. Now we have that. The pressure is simply the force divided by the area over which it acts, and the force is the weight of the baby. The area is what was given to us, so the way that the baby is 3.5 kilograms, the massive baby is 3.5 kilograms gets wait, times that by gravity. Then we divide by 90 times 10 to the minus forthe meter square, and we wind up with 3.8 killer Pascal's. And if we walked out in millimetres of Mercury, we can use our conversion factor, and we get that that is 28 millimeters America. And in the look in the chapter. They say that basically that you have to you feel like you have to urinate when your bladder pressure is over 25 millimeters of mercury. So yes, um, alone be great enough to trigger the make sure ish and mature Ishan reflects.

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