Compare your results from (a) with the short period approximation and Phugoid approximation. How big are the errors in percent between the natural frequency and damping ratios calculated using the approximations and those calculated from the full EoM

Analyze the factors that influence the choice between the following pairs of processes to make the products indicated: i) sand casting versus die casting of an electric-motor housing ii) thread rolling versus machining of a bolt for high-strength application. (co3/c5)