phys203 - homework 10_Solutions

# phys203 - homework 10_Solutions - Milky Way Galaxy 3 Three...

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Homework 10 1. Herschel classified nebulae into several categories as follows: I. Bright Nebulae II. Faint Nebulae III. Very faint Nebulae IV. Planetary Nebulae V. Very large Nebulae VI. Very compressed and rich star clusters VII. Compressed clusters of small and large (i.e., faint and bright) stars VIII. Coarsely scattered clusters of stars a. In general, three classifications were used: hot gas clouds, globular star clusters, and candidate galaxies. 2. Hubble established that Andromeda is a galaxy outside the Milky Way by using Cepheid variables in order to determine distances in space. This method uses the period of variation of stars, which is closely related to luminosity to find distances. Furthermore, Hubble examined the red shift of light from galaxies and found that it increases in a direct ratio to how far from earth each galaxy is. This all helped him to determine in 1924, that Andromeda is far outside the

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Unformatted text preview: Milky Way Galaxy. 3. Three reasons why a pendulum could not work on an ocean voyage are as follows: I. The metal in the pendulum would expand and contract with changes in temperature, which affected the accuracy of its time keeping. II. Pemdulum’s are also meant for placement on a stable and still wall. The rough thrashing of the ocean and the tumultuous waves rendered the pendulum significantly useless. III. The period of a pendulum depends on g, which changes slightly, depending on distance from equatior. 4. A = (2П)^2(R of Eath)/t^2 g = 9.8m/s^2 = [(2П)^2(6.37*10^6m)( X )(1day)^2(1hour)^2(1min)^2]/ [(1day)^2(24hrs)^2(60min)^2(60sec)^2] Solve for x… you find that X = 291.50; therefore, the earth needs to rotate 291.50 times per day in order to have a centripetal acceleration at the equator equal to g. 5. 6. 7. 8. 9. 10....
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## This homework help was uploaded on 02/20/2009 for the course PHYS 203 taught by Professor Padamsee, h during the Spring '08 term at Cornell.

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phys203 - homework 10_Solutions - Milky Way Galaxy 3 Three...

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