Answer :
Final answer:
The physical examination of the boy reveals that his head circumference is at the 99th percentile, indicating a larger head size compared to most children. His weight and length are at the 25th percentile, suggesting slower growth or a smaller build. The boy did not receive any vaccinations or medications after birth due to parental preference for a 'natural' newborn period. The family history is unremarkable, indicating no significant medical conditions or genetic factors.
Explanation:
Based on the given information, the physical examination of the boy reveals the following:
- Head circumference at the 99th percentile: This means that the boy's head size is larger than 99% of children in the reference population. A larger head circumference can sometimes be associated with conditions such as hydrocephalus or genetic syndromes, but further evaluation would be needed to confirm any underlying cause.
- Weight and length at the 25th percentile: The boy's weight and length are below average compared to the reference population. This could indicate slower growth or a smaller build, but it does not necessarily indicate a health problem on its own.
- No vaccinations or medications after birth: The boy's parents chose not to administer vaccinations or medications during the newborn period, likely due to a preference for a 'natural' approach. It is important to note that vaccinations are recommended to protect against various diseases and promote overall health.
- Unremarkable family history: The boy's family history does not indicate any significant medical conditions or genetic factors that could impact his health.
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vFinal answer:
The statement in the question is false. The state of stress can be uniquely defined by six stress components acting on three mutually perpendicular planes.
Explanation:
The statement in the question is false. The state of stress can be uniquely defined by six stress components acting on three mutually perpendicular planes, not three mutually parallel planes. These planes are often referred to as the x, y, and z planes. The stress components include normal stresses and shear stresses acting on each plane.
By considering the stress components on these three planes, engineers and scientists can fully describe the state of stress within a material. This information is crucial for analyzing the mechanical behavior of materials and designing structures that can withstand the applied forces.
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