Describe a wave, as the term is understood in physics. Define simple harmonic mo
ID: 1566467 • Letter: D
Question
Describe a wave, as the term is understood in physics. Define simple harmonic motion. Define resonance. What does it mean to measure sound in decibels? Describe the Doppler effect. Give an example of a transverse wave. Give an example of a longitudinal wave. The pendulum of an astronomical observatory clock swings in a very small arc. Why? The suspension of one wheel set (a so-called 'truck') on semi-tractor trailer supports one sixth of the weight of the vehicle. If the stiffness (k) of one wheel set is equal to 1.89 times 10^5 N/m and the frequency of the oscillations after hitting a small bump is 1.28 Hz, what is the mass the assembly is supporting? [The mass of the whole vehicle is six times this, but we just need the mass supported by one assembly.] An Airbus A321 jet liner has cabin noise level of 10^-4.2 W/m^2. What is this intensity in decibels? [Caution. You may have to express 10^-4.2 as 10^-4.2 for it to work on a TI or other calculator.]Explanation / Answer
1. Wave motion is the motion of disturbance caused. The energy of the disturbance travels with the wave without the particles associated with wave moving forward.
Example is sound wave, where the vibrations in air column travel as a sound wave. The air layers oscillate remaining at one place and the oscillation disturbs the nearby air layer which then vibrates and disturbs layer adjacent to it and so on.... the sound wave travels.
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2. Simple harmonic motion is a straight line motion where the force on a particle is directly proporional to its displacment from a fixed point and is directed towards this fixed point on the line.
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