Final answer:
The question is about calculating the amount by which a wrestler's upper arm bone shortens when they stand on one hand, involving Physics concepts like stress, strain, and Young's modulus at the High School level.
Step-by-step explanation:
The subject of this question is related to Physics, specifically to the area concerning the biomechanics of the human body and the elastic properties of materials. The question is likely at a High School level, as it combines concepts from both biology and physics that are generally covered in high school curricula.
It requires understanding the relationship between force applied to an object, in this case, the upper arm bone represented as a uniform rod, and its resulting deformation. This falls under the topic of stress, strain, and Young's modulus, which are part of the study of mechanics within Physics. To answer this question accurately and provide the requested calculations, knowledge of Hooke's law and the formula for Young's modulus is necessary.