Physics 3221 Problem Set 2 • Due Wednesday, September 15, 5:00 p.m. You may either hand in your assignment in class or place it in the folder my mailbox. • Please remember to be clear and concise. Show any work necessary to follow your arguments; however, do not include your “scrap work.” • Reading: Sections 1.9–1.11 and 1.13–1.14 of Marion and Thornton . You’ll need to brush up on vectors if you are rusty. Problems 1–4 require you to make order of magnitude estimates. The objective is not to get a precise number, but rather a quick and reasonably accurate estimate which uses information which is readily available to you. It is important to be clear about your assumptions when making these estimates. If needed, draw ﬁgures! 1. A neutron star consists almost entirely of neutrons which are packed densely (no space between them). To order of magnitude, what is the density of a neutron star? How does it compare to the earth’s density? 2. The radiant energy from the sun at the earth’s surface is about 1
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