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\begin{document}
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\exametitle{Calculo Vetorial}{Ficha 2}{\today}
\begin{questao}{}
\noindent Calcule o integral de superfície
$$
I=\int\int_{z=\sqrt{x^2+y^2}, \; 1 \leq \sqrt{x^2+y^2} \leq 3} x^2 z dS.
$$
\end{questao}
\begin{questao}{}
\noindent Calcule o integral de superfície
$$
I=\int\int_{z=\sqrt{x^2+y^2}, \; 2 \leq \sqrt{x^2+y^2} \leq 4} x^2 z dS.
$$
\end{questao}
\begin{questao}{}
\noindent Calcule o integral de superfície
$$
I=\int\int_{z=\sqrt{x^2+y^2}, \; 3 \leq \sqrt{x^2+y^2} \leq 5} x^2 z dS.
$$
\end{questao}
\begin{questao}{}
\noindent Calcule o integral de superfície
$$
I=\int\int_{z=\sqrt{x^2+y^2}, \; 2 \leq \sqrt{x^2+y^2} \leq 3} x^2 z dS.
$$
\end{questao}
\begin{questao}{}
\noindent Calcule o integral de superfície
$$
I=\int\int_{z=3(x^2+y^2)^{-2}, \; x^2+y^2\leq 9} (1+144 (x^2+y^2)^{-5})^{-2} (x^2+y^2)^{-6}dS.
$$
\end{questao}


\end{document}
