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Unformatted text preview: ECE 473/TAM 413 Homework Assignment #1 Due: Friday, September 5, 2008 at the beginning of class Note : A good sketch involves scaling wherein the interesting features of the graph nicely occupy the available paper area, with appropriate labeling of the axes. 1. Atmospheric pressure (1 atm = 101,325 Pa) represents simply the weight of all the air above you, where weight is mass times acceleration due to gravity. (a) If g = 9.8 m/s 2 , then determine the mass (in kg) of air that lies in the vertical column standing about each square meter of the Earth’s surface. (b) If the density of air remained constant at 1.21 kg/m 3 all the way to the top of the atmosphere and then abruptly dropped to zero, then determine the altitude of the upper boundary. 2. Problem 1.3.2 in Kinsler et al. 3. For a harmonic oscillator, let a massless spring have stiffness s = 10 kN/m. (a) How much mass would have to be added in order to obtain a natural frequency of 500 Hz? (b) How much resistance could the system have and still retain onehalf of its original amplitude after vibrating...
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This note was uploaded on 09/19/2009 for the course NPRE 402 taught by Professor Ragheb during the Spring '08 term at University of Illinois at Urbana–Champaign.
 Spring '08
 RAGHEB

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