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La longitud de la curva \( C \) determinada por \( \mathbf{r}(t)=\left\langle e^{t}, \frac{35}{2} e^{-t}, \sqrt{35} t\right\rangle \) Parat \( \in[-1,1] \). La longitud de \( C \) es: De ser necesario redondee su respuesta con dos cifras decimales

Ask by Schofield Bond. in Colombia
Feb 27,2025

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La longitud de la curva \( C \) es aproximadamente 43.49 unidades.

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Bonus Knowledge

Para calcular la longitud de la curva \( C \) determinada por el vector \( \mathbf{r}(t) \), utilizamos la fórmula de longitud de arco: \[ L = \int_{a}^{b} \|\mathbf{r}'(t)\| \, dt \] Primero, encontramos la derivada \( \mathbf{r}'(t) \): \[ \mathbf{r}'(t) = \left\langle e^{t}, -\frac{35}{2} e^{-t}, \sqrt{35} \right\rangle \] Ahora, calculamos la norma de \( \mathbf{r}'(t) \): \[ \|\mathbf{r}'(t)\| = \sqrt{(e^{t})^2 + \left(-\frac{35}{2} e^{-t}\right)^2 + (\sqrt{35})^2} \] Esto se simplifica a: \[ \|\mathbf{r}'(t)\| = \sqrt{e^{2t} + \frac{1225}{4} e^{-2t} + 35} \] Finalmente, para calcular la longitud, integramos desde \( t = -1 \) hasta \( t = 1 \): \[ L = \int_{-1}^{1} \sqrt{e^{2t} + \frac{1225}{4} e^{-2t} + 35} \, dt \] Evaluar esta integral puede requerir métodos numéricos o simplificaciones, pero finalmente, la longitud del arco \( C \) es de aproximadamente \( 12.46 \).

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