1. She is in a position that is neutrally buoyant…so that she can continue to br

Question

1. She is in a position that is neutrally buoyant…so that she can continue to breathe through her mouth. Believing that 70% of her body is composed of water, and 25% is composed of denser materials (bones, teeth, etc.) with a specific gravity of 1.1, what is the specific gravity of the remaining 5% of her body/internal composition?

2. An aneurism is a region of an artery that has ballooned out. That region is at risk of rupture and can be extremely dangerous. Determine the increase/change in pressure in mmHg in an aneurism downstream/below a 1.0-cm-diameter artery that has ballooned out to a diameter of 5.0 cm. The individual is standing up straight. The blood pressure in the blood vessel just up-stream from the aneurism is 100 mmHg. The blood flow rate is 2.5 l/min.

Explanation / Answer

Specific gravity = density of sample / density of water

So, specific gravity of water = 1 ( 70% of the body)

specific gravity of denser materials = 1.1 ( 25% of the body)

Now, remaining 5% should have specific gravity so that its balances the excess specific gravity

70 % * 1.0 + 25 % * 1.1 + 5% * X = 100 % * 1.0

X = 0.5

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