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When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
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Quality of Water01:19

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In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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Density and Archimedes' Principle01:05

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When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
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Waterborne.

Kwesi Reynolds

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    |October 14, 2017
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    Summary
    This summary is machine-generated.

    This photo essay documents the Flint water crisis, highlighting residents' struggles and the city's recovery efforts. It underscores the environmental injustice faced by citizens as a human rights violation.

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    Area of Science:

    • Environmental Science
    • Public Health
    • Human Rights

    Background:

    • The Flint water crisis involved the contamination of the municipal water supply with lead.
    • This contamination led to significant public health concerns and community distress.

    Purpose of the Study:

    • To visually document the human impact of the Flint water crisis.
    • To illustrate the concept of environmental injustice through photographic evidence.
    • To frame the crisis as a violation of fundamental human rights.

    Main Methods:

    • The study utilizes a collection of photographs taken by a Flint resident who is a photographer and cinematographer.
    • The images capture various aspects of the crisis, including citizen struggles and community meetings.
    • The visual narrative includes documentation of repair efforts within the city.

    Main Results:

    • The photographs provide a powerful visual record of the citizens' lived experiences during the crisis.
    • The collection illustrates the multifaceted challenges faced by the Flint community.
    • The images serve as evidence of environmental injustice and its human cost.

    Conclusions:

    • The Flint water crisis represents a severe case of environmental injustice with profound human rights implications.
    • Visual documentation is a critical tool for understanding and communicating the impact of such crises.
    • Addressing environmental injustice is crucial for protecting public health and human rights.