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18 polaris the north star doesnt appear to move in

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18. Polaris, the North Star, doesn't appear to move in the sky because*a) it lies directly over the northern axis of the Earthb) the stars are fixed relative to each otherc) it is too nearby for the motion to be discernibled) it is located directly overhead of everyone on Earth19. The gravitational force between two bodies is:
20. The Doppler effect causes light emitted from a body moving awayfrom the observer to be21. Electromagnetic emissions in the ultraviolet part of the spectrum have
22. The Sun is primarily composed ofa) liquid hydrogen*b) hydrogen gasc) helium gasd) oxygen and nitrogen
23. Explain any one of Kepler's laws of planetary motion in terms ofNewton's law of gravitational force. 10 points24. Name three astronomical observations made by Galileo. Why wereeach important?25. Show the three nuclear reactions which convert 6 protonsinto Helium 4 (2 protons plus 2 neutrons) plus 2 protons.Why do these processes cause energy in the form of heatto be produced?3
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Term
Fall
Professor
WINGERT
Tags
Astronomy, Neutron, Light, Electromagnetic spectrum, Fundamental physics concepts

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