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Related Concept Videos

Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
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Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now? 
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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Transformations modify the graphical representation of a function without changing its fundamental form. One common transformation is reflection, which flips the graph across a designated axis. When the vertical coordinates of all points are multiplied by the negative one, the entire graph is mirrored over the horizontal axis. This transformation reverses the vertical orientation of peaks and troughs, akin to signal inversion in electrical systems, where a waveform is flipped, but the timing of...
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Related Experiment Video

Updated: May 6, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
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A twist in the tale.

Rishi Malhotra1, Rejoo Daniel, Sanja Besarovic

  • 1Hull Royal Infirmary, Hull, Yorkshire, UK.

BMJ Case Reports
|October 29, 2013
PubMed
Summary

A pediatric gastric volvulus, initially misdiagnosed as gastroenteritis, required surgical intervention including laparotomy and gastropexy. This case highlights the critical need for prompt diagnosis and management of this rare condition in children.

Area of Science:

  • Pediatric Surgery
  • Gastroenterology
  • Medical Imaging

Background:

  • Gastric volvulus is a rare condition where the stomach twists on itself.
  • It can present with non-specific symptoms, leading to delayed diagnosis.

Observation:

  • A 4-year-old girl presented with symptoms mimicking gastroenteritis, including retching and abdominal colic.
  • Progressive pain and epigastric distension prompted further investigation.

Findings:

  • Computed tomography (CT) scan revealed gastric volvulus.
  • Urgent laparotomy was performed to decompress the stomach and repair a lesser curvature perforation.
  • Complications included sepsis and reperforation, necessitating a second laparotomy with gastropexy.

Implications:

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  • This case underscores the importance of considering gastric volvulus in pediatric patients with persistent abdominal symptoms.
  • Prompt surgical intervention is crucial for managing gastric volvulus and its complications.
  • Long-term jejunal feeding may be required, emphasizing the severity and recovery challenges.