MT2ans - ASTR 1010 Mid-Term Exam 2 Answers Version 1 and...

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Check, check, check that your answers make sense ASTR 1010 Mid-Term Exam 2 – October 15, 2007 - Answers Version 1 and Version 2 are the same – just different numbering of the questions – this is Version 1. 1 On a scale where the Sun is about the size of a grapefruit and the Earth is about 15 meters away from the Sun, about how big is the whole solar system in this scale model? (Assume the solar system ends at Pluto). A. about 100 meters B. about a kilometer C. about the size of Boulder County D. about the size of Colorado E. About the distance across the United States You did a lab on the model solar system where the Sun and AU was about this size. How far did you walk to get to Pluto? It was more than 100 meters (300 feet). And less than the size of Boulder County, no? 2. The diagram above shows Jupiter among the constellations at midnight. In which constellation will Jupiter be when the planet sets? A. Cancer B. Gemini C. Taurus D. Jupiter will not set E. Cannot tell from the information provided This is a variation on a question from MT1. Jupiter is far from the Sun – does not move much relative to the stars each night. So, the apparent motion is just the rotation of the Earth – the stars and Jupiter appearing to move over the day together. 3. Our solar system formed… A. relatively shortly after the Big Bang B. very recently – less than a tenth of the way back in time to the Big Bang C. about 1/3 of the way back in time to the Big Bang D. about 2/3 of the way back in time to the Big Bang E. before the Big Bang Big Bang happened about 14 billion years ago – our solar system formed about 4.5 billion years ago. 4. Stellar parallax is not visible to the naked eye. Which one of the following changes would make the greatest difference in making parallax easier to detect? A. make the Earth's orbit much larger. B. greatly increase the rate of precession – precession means wobble of the Earth’s spin axis – the other P-word C. make the Earth move much faster in its current orbit – When you hold your finger up at arms length and blink, blinking faster does not make the parallax bigger, does it? D. significantly change the tilt of Earth's rotation axis – does not change the parallax. E. get away from streetlights. – sure would be easier to see objects – but does not increase the parallax. Looking at stars from perspectives that are farther apart makes the parallax bigger. Try not just blinking but also moving your head left and right synchronous with blinking left and right.
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