lect 3 - 1/25/2010 Question11 The laws of physics developed...

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1/25/2010 1 Question 1 1 The laws of physics developed in laboratories on Earth are generally assumed to be valid A only in our galaxy A. only in our galaxy. B. everywhere in the universe. C. only in our solar system. D. only on Earth. Question 1 2 One important characteristic of a scientific theory is that it A. Need not have a connection with physical reality. B. Is mathematical. C. Consists of at least three separate hypothesis. D. Can be tested by observation. What is another way of saying "the moon subtends 0.5 degrees in the sky" A. The extent of the moon in the sky is about 30 arcminutes. Question 1 3 B. The moon is big C. The moon takes about 60 arcseconds to rise. D. The extent of the moon in the sky is about 30 arcseconds. E. The moon takes about 60 arcminutes to rise.
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1/25/2010 2 One astronomical unit is defined as the A. distance from which Earth-Sun distance will subtend an angle of one arcsecond. B mean distance between the Sun and the Earth Question 1 4 B. mean distance between the Sun and the Earth. C. distance traveled by light in one parsec D. distance traveled by one astronaut at the speed of light. E. distance traveled by light in one year. About how far would you need to travel in a spaceship (starting on Earth) before you found that the angular separation between the Earth and sun was about 1 arcsecond? Choose the closest answer. A. 1 light-year Question 1 5 B. 1 parsec C. 1 AU D. 3600 parsec E. Jupiter Question 1-6 From January to July, the position of star A, when viewed from an observer on Earth, appeared to move a certain amount with respect to the distant stars. In class we used the diagram below to determine how the observer's view would change throughout the year. Suppose Earth's orbital distance shrunk to 0.5 AU. Would star A move more or less with respect to the distant stars throughout the year? A. Less B. More
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1/25/2010 3 Question 1 7 Tycho Brahe proposed an experiment to determine if the Earth orbited the sun or if the sun orbited Earth by measuring if the angular separation of two distant stars changed throughout the year. His measurements showed that the angular separation of distant stars did not change throughout the year. Why did this not prove that the sun orbited Earth? A. The angular separation does change, but it was far too large of an angle to measure.
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This note was uploaded on 02/06/2011 for the course ASTR 113 taught by Professor Geller during the Spring '08 term at George Mason.

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lect 3 - 1/25/2010 Question11 The laws of physics developed...

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