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Unformatted text preview: Physics 105: Mechanics Fall 2009 Homework 5 Due Friday 10/2 Read sections 4.5-4.13 in the text. Do the following problems. 1. Do 4.HW.78. 2. Do 4.HW.79. 3. Do 4.HW.80. 4. Do 4.HW.81. 5. Consider two springs, both with negligible mass. The relaxed lengths of the two springs are equal ( L ), but one has stiffness k A and the other k B . (a) The two springs are connected in series. Derive an expression for the effective spring constant k series . (b) The two springs are connected in parallel. Derive an expression for the effective spring constant k parallel . Hint: generalize our discussions in class, where we considered identical springs in series and in parallel. 6. A penny is actually 97.5% zinc. A copper coating gives it its characteristic appearance. For the purposes of this problem, ignore the copper content and approximate the penny as pure zinc. A penny has a mass of 2.50 g, a diameter of 1.90 cm, and an average thickness of 1.23 mm. The atomic mass of zinc is 65 amu (or 65 g/mol).atomic mass of zinc is 65 amu (or 65 g/mol)....
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