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Related Concept Videos

Impulse01:13

Impulse

According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the total...
Impulse-Momentum Theorem00:49

Impulse-Momentum Theorem

The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
By writing Newton's second law of motion in terms of the momentum of an object and the external force acting on it, and simultaneously using the definition of the impulse vector, it can be shown that the total impulse on an object is equal to its net...
Design Example: Automobile Ignition System01:14

Design Example: Automobile Ignition System

The automobile's ignition system plays a vital role by ensuring the timely ignition of the fuel-air mixture in each cylinder. This ignition is facilitated by a spark plug, which is composed of two electrodes separated by an air gap. A spark forms across this air gap when a substantial voltage is generated between the electrodes, leading to the ignition of the fuel.
One can generate a large voltage using a car battery of 12 volts with the help of inductors. Inductors are known for opposing rapid...
Conservation of Momentum: Problem Solving01:30

Conservation of Momentum: Problem Solving

Solving problems using the conservation of momentum requires four basic steps:
Conservation of Linear Momentum for a System of Particles01:28

Conservation of Linear Momentum for a System of Particles

In the dynamic realm of billiards, a fascinating interplay of forces governs the motion of cue balls and stationary balls. When the cue ball collides with a stationary ball, linear momentum is exchanged. The cue ball imparts a fraction of its linear momentum to the stationary ball, causing the cue ball to decelerate while initiating the motion of the stationary ball.
The impulsive force at play during this interaction is of extremely short duration, rendering its impulse negligible. When...
Impulse Response01:17

Impulse Response

The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...

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Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
08:38

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Published on: September 1, 2011

Impulse noise generated by starter pistols.

Deanna K Meinke1, Donald S Finan, Jacob Soendergaard

  • 1Audiology and Speech-Language Sciences, University of Northern Colorado, Greeley, Colorado 80639, USA. Deanna.Meinke@unco.edu

International Journal of Audiology
|February 5, 2013
PubMed
Summary

Starter pistols generate high sound pressure levels, posing a significant noise-induced hearing loss risk for sports officials. Even a few shots from a .22 caliber pistol exceed safe exposure limits for unprotected ears.

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Area of Science:

  • Audiology
  • Occupational Health
  • Acoustics

Background:

  • Sports officials and athletes are exposed to impulsive noise from starter pistols.
  • Understanding the acoustic characteristics of starter pistols is crucial for assessing hearing risk.

Purpose of the Study:

  • To quantify the sound pressure levels (SPL) and maximum permissible exposures (MPE) from .22 and .32 caliber starter pistols.
  • To evaluate the risk of noise-induced hearing loss for individuals near starter pistol use.

Main Methods:

  • Acoustic measurements of starter pistols firing blanks compared to firearms.
  • Analysis of sound directionality, distance, peak SPL, and L(eqA8).
  • Calculation of MPE for unprotected ears based on acoustic metrics.

Main Results:

  • Starter pistols produce peak SPLs exceeding 140 dB.
  • MPEs are as low as five for .22 caliber and 25 for .32 caliber pistols.
  • Impulsive sounds result in unacceptably small MPE numbers for those near the shooter.

Conclusions:

  • Starter pistol noise poses a significant hearing risk to unprotected sports officials.
  • While direct risk to athletes at a distance may be low, cumulative noise exposure is a concern.
  • Hearing protection should be considered for officials and others in close proximity to starter pistols.