Chapter 1 Sec. 4 Flashcards

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Verified questions

biology

Suppose the inner surface of a neuron cell membrane changes from being 60 mV more negative than the outer surface to being 50 mV more negative. Is the neuron closer to producing an action potential or farther from doing so? Explain.

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health

Collect several newspaper articles about accidents in and around your community. Try to identify each of the links of the accident chain and ways the chain might have been broken.

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chemistry

Calculate the pH of a formic acid solution that contains 1.35% formic acid by mass. (Assume a density of 1.01 g/mL for the solution.)

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engineering

Many recreation facilities use inflatable "bubble" structures. A tennis bubble to enclose four courts is shaped roughly as a circular semicylinder with a diameter of $30 \mathrm{~m}$ and a length of $70 \mathrm{~m}$ . The blowers used to inflate the structure can maintain the air pressure inside the bubble at $10 \mathrm{~mm}$ of water above ambient pressure. The bubble is subjected to a wind that blows at $60 \mathrm{~km} / \mathrm{hr}$ in a direction perpendicular to the axis of the semicylindrical shape. Using polar coordinates, with angle $\theta$ measured from the ground on the upwind side of the structure, the resulting pressure distribution may be expressed as

\frac{p-p_{\infty}}{\frac{1}{2} \rho V_w^2}=1-4 \sin ^2 \theta

where $p$ is the pressure at the surface, $p_{\infty}$ the atmospheric pressure, and $V_w$ the wind speed. Determine the net vertical force exerted on the structure.

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