midterm1-11f-solns - laboratory is observed to be Doppler...

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Answer Key Testname: MIDTERM1 - 11F - MC 1) A 2) E 3) C 4) C 5) D 6) C 7) C 8) C 9) D 10) D 11) D 12) A 13) A 14) C 15) C 16) C 17) A 18) D 19) E 20) C 21) A 22) A 23) A 24) B 25) B 26) B 27) C 28) B 29) A 30) C 31) A 32) D 33) B 34) B 35) C 36) E 37) A 8
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SHORT ANSWER. Answer the question(s), showing the work of any computations needed. 38) An object of mass 1 kg falls in the earth's gravitational acceleration of about 10 m/s 2 . Neglecting air resistence, and starting from rest, what is its speed after 5 seconds? b How would this change if the object had a mass of 2 kg? 38) 39) A planet orbits a star with mass of 3 times the solar mass at a distance of 3 AU. In earth years, about how often would beings on this planet celebrate birthdays? 39) 8
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40) A binary star system has a parallax of 1/10 arcsec. a. What is the distance to the system in parsec? b. If the two stars of the binary orbit each other with Fxed spatial separation of 5 AU, what is the apparent angular size of their orbit in arcsec? 40) 41) A spectral line that normally has a wavelength of 300 nm in the
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Unformatted text preview: laboratory is observed to be Doppler shifted to a wavelength of 301 nm in the spectrum of a star. a. Is the star moving toward or away from the observer? b. What fraction of the speed of light is this star moving? c. Given that the speed of light is 300,000 km/s, compute the star's speed in km/s. 41) 9 42) A star has an effective surface temperature that is twice that of the sun, but the same diameter. a. In terms of the solar luminosity Lsun, what is the star's luminosity L (i.e. total energy output per unit time)? b. Recalling that the sun has it spectral energy peak at a wavelength of about 500 nm, what would be the wavelength of peak energy of this star? 42) 10...
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midterm1-11f-solns - laboratory is observed to be Doppler...

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