Med Term 7 Flashcards

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physics

A Flea's Jump The resilin in the body of a flea has a force constant of about $24 \mathrm{~N} / \mathrm{m}$ , and when the flea cocks its jumping legs, the resilin associated with each leg is compressed by approximately $0.12 \mathrm{~mm}$ . Given that the flea has a mass of $0.56 ~\mathrm{mg}$ , and that two legs are used in a jump, estimate the maximum height a flea can attain by using the energy stored in the resilin. (Assume the resilin to be an ideal spring.)

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chemistry

From cathode ray experiments, J. J. Thomson estimated that the mass of an electron was “about a thousandth” of the mass of a proton. How accurate is that estimate? Calculate the ratio of the mass of an electron to the mass of a proton.

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earth science

Compare and Contrast How are plateaus and mountains alike? How are they different?

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physics

A certain loudspeaker system emits sound isotropically with a frequency of $2000 \mathrm{~Hz}$ and an intensity of $0.990 \mathrm{~mW} / \mathrm{m}^{2}$ at a distance of $6.10 \mathrm{~m}$ . Assume that there are no reflections. (a) What is the intensity at $30.0 \mathrm{~m}$ ? At $6.10 \mathrm{~m}$ . what are (b) the displacement amplitude and (c) the pressure amplitude?