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Related Concept Videos

Types Of Collisions - I01:04

Types Of Collisions - I

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When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
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Types of Collisions - II01:19

Types of Collisions - II

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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision02:43

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The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
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Elastic Collisions: Introduction01:00

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An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
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Elastic Collisions: Case Study01:15

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Collisions in Multiple Dimensions: Introduction01:05

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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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[Leukemia caused by collision with a wild pig?]

Maximilian Zimmermann1, Gerd Bendas2, Georg Feldmann1

  • 1Medizinische Klinik 3, Centrum für Integrierte Onkologie (CIO) Köln-Bonn, Universitätsklinikum Bonn.

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A previously healthy woman developed neutropenic fever and agranulocytosis after self-medicating with metamizole. Prompt treatment led to full recovery, highlighting the risks of this medication.

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Area of Science:

  • Pharmacology
  • Hematology
  • Infectious Diseases

Background:

  • A 23-year-old woman presented with neutropenic fever, initially suspected to be acute leukemia.
  • She reported a recent traumatic event involving a pig carcass and subsequent back pain.

Observation:

  • Initial presentation included thrombocytopenia, severe neutropenia (0.04G/L), elevated C-reactive protein, procalcitonin, and creatinine.
  • The patient developed acute cholecystitis during hospitalization.

Findings:

  • Agranulocytosis was diagnosed, attributed to a single 1g dose of metamizole taken as self-medication.
  • Infectious complications arose during the episode of drug-induced agranulocytosis.

Implications:

  • This case underscores the potential for metamizole to cause severe agranulocytosis and infectious complications.
  • Careful consideration of the indication for metamizole is crucial, despite its utility.