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Related Concept Videos

Projectile Motion: Example01:18

Projectile Motion: Example

The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on level...
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PPE Use in Healthcare Settings II: Doffing01:10

PPE Use in Healthcare Settings II: Doffing

The sequence of removing or doffing PPE starts with the gloves, as they are the most contaminated. Next is removal of the face shield or goggles, as they would interfere with removing other PPE. Then remove the gown, followed by the mask or respirator. Perform hand hygiene between steps if hands become contaminated and immediately after removing all PPE. Generally, the outside front and sleeves of the isolation gown, the goggles or the mask, the respirator, and the face shield are contaminated.
Projectile Motion01:20

Projectile Motion

An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called projectile motion, and the object itself a projectile. The parabolic path followed by the projectile is called the trajectory. Some common examples of projectile motion are the launching of fireworks, a golf ball in the air, meteors entering the Earth's atmosphere, and the firing of bullets.
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The Extrinsic Apoptotic Pathway01:17

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The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
Design Example: Flow Through a Fire Extinguisher01:12

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Shooting through clothing in firearm suicides.

Petr Hejna1, Miroslav Safr

  • 1Institute of Legal Medicine, Charles University, Prague, Czech Republic. hejnap@lfhk.cuni.cz

Journal of Forensic Sciences
|March 6, 2010
PubMed
Summary

Suicide victims rarely remove clothing before firearm injury. Finding bullet holes in clothing does not automatically rule out suicide, but removing clothing strongly suggests self-inflicted wounds.

Area of Science:

  • Forensic Pathology
  • Ballistics Analysis

Background:

  • Empirical observations suggest suicide victims remove clothing before firearm injury.
  • Presence of bullet defects in clothing has historically raised suspicion of homicide or accidental discharge.

Purpose of the Study:

  • To investigate the frequency of clothing removal at the entry wound site in fatal suicidal firearm injuries.
  • To re-evaluate the evidentiary value of clothing defects in determining the manner of death.

Main Methods:

  • Retrospective study of fatal firearm injuries.
  • Analysis of 43 cases with gunshot wounds to the thorax (1980-2007).
  • Examination of clothing at the entry wound site.

Main Results:

  • Only 9% (4 out of 43) of suicide victims removed clothing from the entry wound site.

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  • Bullet defects in clothing were not a reliable indicator to exclude suicide.
  • Clothing removal was a strong indicator of suicide.

    • Conclusions:

    • The assumption that suicide victims remove clothing is largely unfounded.
    • Clothing defects should not be solely relied upon to dismiss suicide.
    • Absence of clothing at the wound site is a significant indicator of suicide.