Question

Find a vector function r that satisfies the indicated conditions. r(t)=6i+6tj+3t2k;r(0)=i2j+k\mathbf{r}^{\prime}(t)=6 \mathbf{i}+6 t \mathbf{j}+3 t^{2} \mathbf{k} ; \mathbf{r}(0)=\mathbf{i}-2 \mathbf{j}+\mathbf{k}

Solution

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Answered 1 year ago
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Calculate the indefinite integral of the vector function r(t)\mathbf{r}^{\prime}\left(t \right) to obtain the expression of r(t)\mathbf{r}\left(t\right).

r(t)=Cr(t)  dt=6  dt,6t  dt,3t2  dt=6t,3t2,t3+c\begin{align*} \mathbf{r}\left(t\right)&=\underset{C}{\int}\mathbf{r}^{\prime}\left(t \right)\;dt\\ &=\left\langle\int\limits_{}^{}6\;dt,\int\limits_{}^{}6t\;dt,\int\limits_{}^{}3t^2\;dt\right\rangle\\ &= \left\langle6t,3t^2,t^3\right\rangle+\mathbf{c} \end{align*}

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