Provide the most accurate response to the following questions.
Which of the following vectors is parallel to \(\vec {p}(1)?\)
\(\vector {1,0}\) \(\vector {0,1}\) \(\vector {1,1}\) \(\vector {1,-1}\) \(\vector {-1,1}\) more than one of these.
Which of the following vectors is parallel to \(\vec {p}'(1)?\)
\(\vector {1,0}\) \(\vector {0,1}\) \(\vector {1,1}\) \(\vector {1,-1}\) \(\vector {-1,1}\) more than one of these.
Which of the following vectors is orthogonal to \(\vec {p}'(2)?\)
\(\vector {1,0}\) \(\vector {0,1}\) \(\vector {1,1}\) \(\vector {1,-1}\) \(\vector {-1,1}\) more than one of
these.
Which of the following vectors is parallel to \(\vector {y(3),-x(3)}?\)
\(\vector {1,0}\) \(\vector {0,1}\) \(\vector {1,1}\) \(\vector {1,-1}\) \(\vector {-1,1}\) more than one of these.
Make sure you understand the logic behind each response.
- Note that \(\vec {p}(1)\) will extend from the origin to the point associated to \(\vec {p}(1)\), so any vector with an \(x\)-component of \(0\) and a nonzero \(y\)-component will be parallel to \(\vec {p}(1)\).
- Note that \(\vec {p}'(1)\) will be a tangent vector to the curve at the point associated to \(\vec {p}(1)\). From the image, the \(x\) and \(y\) components of such a vector should be approximately equal.
- Note that \(\vec {p}'(2)\) will be a tangent vector to the curve at the point associated to \(\vec {p}(2)\). From the image, the \(x\)-component of such a vector can be nonzero, but the \(y\)-component should be \(0\). Thus, a vector orthogonal to this will have nonzero \(y\)-component, but its \(x\)-component should be \(0\).
- Note that \(\vec {p}(3)\) will extend from the origin to the point associated to \(\vec {p}(3)\). From the image, it looks like \(x(3) \approx -y(3)\) so any vector parallel to \(\vector {y(3),-x(3)}\) will have approximately the same \(x\) and \(y\) components.