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Frequency Range of Human Hearing

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Frequency Range of Human Hearing. Edited by Glenn Elert - Written by his students. An educational, Fair Use. Cutnell, John D. and Kenneth W. Johnson. Physics. 4th ed. New York: Wiley, 1998: 466. Experiments have shown that a healthy young person hears all sound frequencies from approximately 20 to 20,000 hertz. Ear Microsoft Encarta Encyclopedia. The maximum range of human hearing includes sound frequencies from about 15 to about 18,000 waves, or cycles, per second. New York: Grolier, 1967: 285. The huma...

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Center of Mass of a Human

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Center of Mass of a Human. Edited by Glenn Elert - Written by his students. An educational, Fair Use. The purpose of this experiment is to locate the center of mass of people, to determine whether the center of mass is different for males and females, and to calculate the ratio of a person's center of mass to his/her height. Sigma;τ = rF. Lay two 2 x 4 wooden beams of approximately 243 cm (8 ft) length side by side across two scales so that the ends of each beam are situated at the center of each scale.

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Index of Refraction of Diamond

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Index of Refraction of Diamond. Edited by Glenn Elert - Written by his students. An educational, Fair Use. Serway, Raymond A. The Law of Refraction College Physics. Pacific Grove, CA: Thompson, Brooks/Cole. 2003: 692. Material properties of a diamond. Wikipedia. May 2005. Diamond has a high refractive index (2.417) and moderate dispersion (.044). All About Jewels Glossary R. Enchantedlearning. May 2005. Bayerl, Raymond J. Diamond: A many-faceted substance. Northville, 1979: 2. Jamin Bennett - 2005.

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Speed of a Falling Raindrop

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Speed of a Falling Raindrop. Edited by Glenn Elert - Written by his students. An educational, Fair Use. Corbert, John H. Physical Geography Manual. 1974 5th ed. N.p.: Kendall/Hunt, 2003. 127. A large drop of about 5 mm (3/16 in.) diameter reaches a maximum speed of about 9 m/sec. Climate. Encyclopedia Britannica. 2007, Encyclopedia Britannica Online. 25 May 2007. Beard, K.V. Terminal Velocity and Shape of Cloud and Precipitation Drops. Pdf] Journal of the Atmospheric Sciences. See graph 1 below]. Rain is...

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Diameter of an Atom

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Diameter of an Atom. Edited by Glenn Elert - Written by his students. An educational, Fair Use. Henry F. Holtzclaw and William R. Robinson. General Chemistry. Lexington, MA: Heath, 1988: 98. The diameter of an atom is of the order of 10. March, Robert H. Atom. USA: World Book Encyclopedia, 1995: 870. The diameter of an atom ranges from about 0.1 to 0.5 nanometer. Metcalf, Williams, and Castka. Modern Chemistry. New York: Holt, Rinehart and Winston, 1980: 43. The diameter of a nucleus is about 10. All the...

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Frequency of Hummingbird Wings

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Frequency of Hummingbird Wings. Edited by Glenn Elert - Written by his students. An educational, Fair Use. Rauzon, Mark J. Hummingbirds. Ulster, PA. Grolier. 1997: 12-13. Other hummers have been clocked at 200 beats per second. Forshaw, Joseph. Encyclopedia of Birds. New York. Smithmark, 1991: 496. The extremely rapid wing beat (22-78 beats per second), coupled with a rotation of the outer hand portion of the wing and a powdered upstroke permits hummingbirds to hover in front of flowers during foraging.

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Mass of US Beef Consumption

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Mass of US Beef Consumption. Edited by Glenn Elert - Written by his students. An educational, Fair Use. Rehberg, Tracy. The Range of Reason. California News, November 2005. In 2003, Americans consumed 64.9 pounds of beef per person. 294 kg per person per year. Yin, Sandra. Meat Market. American Demographics, 2004. Beef consumption fell to 63 pounds in 2001, 29 percent lower than the high of 89 pounds per person in 1976. 286 - 40.4 kg per person per year. 304 kg per person per year. Kg per person per year).

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Energy of a 1.5 V Battery

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Energy of a 1.5 V Battery. Edited by Glenn Elert - Written by his students. An educational, Fair Use. American Radio Relay League. The AARL Handbook. 1999: 11.20 11.22. Capacity may vary from 35 mAh for some of the small hearing-aid batteries to more than 100 Ah for a size 28 deep-cycle. 0189 J 540 kJ. Assuming 1.5 V). Duracell (Original Equipment Manufacturers pages). The formula for determining cell energy is:. Current Expressed in amperes. Electromotive force expressed in volts. Time expressed in hours.

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Number of Ants in the World

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Number of Ants in the World. Edited by Glenn Elert - Written by his students. An educational, Fair Use. McGavin, George C. Smithsonian Institution's Animal. Occurrence: 9,000 spp. worldwide; in virtually all regions except in Antarctica and on a few oceanic islands. Ant, any member of the approximately 8,000 species of the insect family Formicidae (order hymenoptera). Holldobbler, Bert and Edward O. Wilson. Journey to the Ants: A Story of Scientific Exploration. Ants belong to a family called the Formici...

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Area of Earth's Land Surface

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Area of Earth's Land Surface. Edited by Glenn Elert - Written by his students. An educational, Fair Use. Coble, Charles R; Murray, Elaine G; Rice, Dole R. Earth Science. Englewood Cliffs, NJ: Prentice-Hall, 1987: 102. Surface Area: Land area, about 148,300,000 sq km, or about 30% of total surface area; water area, about 361,800,000 sq km, or about 70% of total surface area. 148,300,000 km. Science Desk Reference American Scientific. New York: Wiley, 1999: 180. 150,000,000 km. 148,847,000 km.