NATS 1720 Lecture Notes - Lecture 7: Damping Ratio, Q Factor, Linear Density
30 Nov 2015
School
Department
Course
Professor
Document Summary
> depends on elasticity (of string) (eg: tension, pressure) v elasticity intertia (vwave = velocity of wave) eg: stretched string vwave= tension linear massdensity (1. 4) pressure mass density ( per unit volume) Vwave= eg: piano string: linear density = 0. 006 kg/m. 0. 006 kg/m = 408m/s (1. 4) 101,325 pa eg: sound in air (at 20 c) = 343 m/s v (t )=331 m/ s( 0 c )+0. 6 xt ( c) > work - what is accomplished when some mass changes its state of motion under the influence of a force. Energy = ability of a system to do work (units of joules) => many forms of energy: kinetic energy. > stored in a system, but not in kinetic form; is converted to kinetic energy if one (or more) constraints are removed. > associated with disordered motion of molecules in an object. Two rules for energy transformation: energy cannot be created or destroyed.
