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Related Concept Videos

Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

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Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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Hazard Ratio01:12

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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
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Hazard Rate01:11

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The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Survey Safety01:28

Survey Safety

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Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
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Social Facilitation01:04

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Not all intergroup interactions lead to negative outcomes. Sometimes, being in a group situation can improve performance. Social facilitation occurs when an individual performs better when an audience is watching than when the individual performs the behavior alone. This typically occurs when people are performing a task for which they are skilled.
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Related Experiment Video

Updated: Mar 17, 2026

Modified Drop Tower Impact Tests for American Football Helmets
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Coed Football: Hazards, Implications, and Alternatives.

H B Falls

    The Physician and Sportsmedicine
    |July 27, 2016
    PubMed
    Summary

    This study examines male-female differences in football to determine safety for teenage girls. It concludes football is too dangerous for most girls and proposes equal preparticipation screening for all players.

    Area of Science:

    • Sports Medicine
    • Pediatric Sports Safety
    • Gender Differences in Athletics

    Background:

    • Investigates the safety of coed participation in tackle football for adolescent females.
    • Addresses concerns regarding physical disparities between teenage boys and girls in contact sports.

    Purpose of the Study:

    • To evaluate the risks associated with teenage girls playing football with boys.
    • To determine if current participation levels pose a significant danger due to physiological differences.

    Main Methods:

    • Analysis of existing data on male-female differences in size, speed, and strength.
    • Review of injury risks in adolescent football.

    Main Results:

    • Significant physiological differences exist between adolescent males and females in size, speed, and strength.

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  • These differences suggest tackle football poses a high risk of injury for most girls.

    • Conclusions:

    • Tackle football is deemed too dangerous for the majority of teenage girls.
    • A standardized preparticipation screening program with equal requirements for both sexes is recommended to mitigate risks.