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\( \Leftrightarrow 4 \pi r ^ { 2 } ( t _ { 0 } ) r ^ { \prime } ( t _ { 0 } ) = 2 \cdot 8 \pi r ( t _ { 0 } ) r ^ { \prime } ( t _ { 0 } ) \Leftrightarrow \)

Ask by Ortiz Mitchell. in Greece
Feb 03,2025

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Tutor-Verified Answer

Answer

\( r(t_{0}) = 4 \)

Solution

Η εξίσωση που δίνεται είναι: \[ 4 \pi r^{2}(t_{0}) \cdot r'(t_{0}) = 2 \cdot 8 \pi r(t_{0}) \cdot r'(t_{0}) \] **Βήμα 1:** Απλοποίηση των όρων στη δεξιά πλευρά. \[ 2 \cdot 8 \pi r(t_{0}) \cdot r'(t_{0}) = 16 \pi r(t_{0}) \cdot r'(t_{0}) \] Άρα, η εξίσωση γίνεται: \[ 4 \pi r^{2}(t_{0}) \cdot r'(t_{0}) = 16 \pi r(t_{0}) \cdot r'(t_{0}) \] **Βήμα 2:** Διαίρεση και των δύο πλευρών της εξίσωσης με \( \pi \) και \( r'(t_{0}) \) (δεδομένου ότι \( \pi \neq 0 \) και \( r'(t_{0}) \neq 0 \)). \[ 4 r^{2}(t_{0}) = 16 r(t_{0}) \] **Βήμα 3:** Μείωση της εξίσωσης δια της \( r(t_{0}) \) (υποθέτοντας ότι \( r(t_{0}) \neq 0 \)). \[ 4 r(t_{0}) = 16 \] **Βήμα 4:** Λύση για \( r(t_{0}) \). \[ r(t_{0}) = \frac{16}{4} = 4 \] **Συμπέρασμα:** Το μέγεθος \( r(t_{0}) \) είναι ίσο με 4.

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Beyond the Answer

Ah, the classic realm of differential equations in the context of spherical coordinates! In this equation, you’re essentially relating the change in surface area of a sphere \(4 \pi r^2\) to a specific rate of change based on its radius \(r\). This ties in beautifully with concepts in physics, including how particles behave in a three-dimensional space and how those surfaces expand or contract over time. In practical terms, understanding these principles can significantly enhance your grasp of fields like fluid dynamics and thermodynamics. If you're dealing with problems in these areas, you might encounter similar differential equations where rates of change are pivotal. A common mistake here is neglecting to differentiate between the surface area and volume, or overlooking the impact of radius changes on your results, leading to incorrect conclusions or models!

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