Let $C$ be the part of the graph $y=\frac{1}{x}\ (x>0)$. Take a point $P\left(t,\ \frac{1}{t}\right)\ (t>0)$ on $C$.

(i) Find the equation of the tangent $l$ at the point $A(1,\ 1)$ on the curve $C$.

(ii) Let $m$ be the line passing through the point $P$ and parallel to $l$.  Denote $Q$ be the intersection point of the line $m$ and the curve $C$ other than $P$. Find the coordinate of $Q$. 

(iii) Express the area $S$ of the part bounded by two line segments $OP,\ OQ$ and the curve $C$ for the origin $O$ in terms of $t$.

(iv) Express the volume $V$ of the solid generated by a rotation of the part enclosed by two lines passing through the point $P$ and pararell to the $y$-axis and passing through the point $Q$ and pararell to $y$-axis, the curve $C$ and the $x$-axis in terms of $t$.

(v) $\lim_{t\rightarrow 1-0} \frac{S}{V}.$
1. **Finding the equation of the tangent \( l \) at the point \( A(1, 1) \) on the curve \( C \):**

   The curve is given by \( y = \frac{1}{x} \). To find the equation of the tangent line at \( A(1, 1) \), we first need to find the derivative of \( y \) with respect to \( x \):
   \[
   \frac{dy}{dx} = \frac{d}{dx} \left( \frac{1}{x} \right) = -\frac{1}{x^2}
   \]
   At the point \( A(1, 1) \), the slope of the tangent line is:
   \[
   \left. \frac{dy}{dx} \right|_{x=1} = -1
   \]
   Using the point-slope form of the equation of a line, \( y - y_1 = m(x - x_1) \), where \( m \) is the slope and \( (x_1, y_1) \) is the point of tangency:
   \[
   y - 1 = -1(x - 1)
   \]
   Simplifying, we get:
   \[
   y = -x + 2 \quad \text{or} \quad x + y = 2
   \]

2. **Finding the coordinates of \( Q \):**

   The line \( m \) passing through the point \( P(t, \frac{1}{t}) \) and parallel to \( l \) has the same slope as \( l \), which is \(-1\). Therefore, the equation of \( m \) is:
   \[
   y - \frac{1}{t} = -1(x - t)
   \]
   Simplifying, we get:
   \[
   y = -x + t + \frac{1}{t}
   \]
   The intersection point \( Q \) of the line \( m \) and the curve \( C \) other than \( P \) satisfies both \( y = \frac{1}{x} \) and \( y = -x + t + \frac{1}{t} \). Setting these equal:
   \[
   \frac{1}{x} = -x + t + \frac{1}{t}
   \]
   Multiplying through by \( x \) to clear the fraction:
   \[
   1 = -x^2 + (t + \frac{1}{t})x
   \]
   Rearranging, we get a quadratic equation:
   \[
   x^2 - (t + \frac{1}{t})x + 1 = 0
   \]
   Solving this quadratic equation using the quadratic formula \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \), where \( a = 1 \), \( b = -(t + \frac{1}{t}) \), and \( c = 1 \):
   \[
   x = \frac{t + \frac{1}{t} \pm \sqrt{(t + \frac{1}{t})^2 - 4}}{2}
   \]
   Simplifying the discriminant:
   \[
   (t + \frac{1}{t})^2 - 4 = t^2 + 2 + \frac{1}{t^2} - 4 = t^2 - 2 + \frac{1}{t^2}
   \]
   Thus:
   \[
   x = \frac{t + \frac{1}{t} \pm \sqrt{t^2 - 2 + \frac{1}{t^2}}}{2}
   \]
   Since \( P(t, \frac{1}{t}) \) is one root, the other root must be \( \frac{1}{t} \). Therefore, the coordinates of \( Q \) are:
   \[
   Q \left( \frac{1}{t}, t \right)
   \]

3. **Expressing the area \( S \) in terms of \( t \):**

   The area \( S \) is the area bounded by the line segments \( OP \), \( OQ \), and the curve \( C \). This can be found by subtracting the area under the curve from the area of the triangle \( OPQ \).

   The area of the triangle \( OPQ \) is:
   \[
   S_{OPQ} = \frac{1}{2} \left| t^2 - \frac{1}{t^2} \right|
   \]
   The area under the curve from \( x = \frac{1}{t} \) to \( x = t \) is:
   \[
   S_{PQ, \text{curve}} = \left| \int_{\frac{1}{t}}^{t} \left( -x + t + \frac{1}{t} - \frac{1}{x} \right) dx \right|
   \]
   Simplifying the integral:
   \[
   \int_{\frac{1}{t}}^{t} \left( -x + t + \frac{1}{t} - \frac{1}{x} \right) dx = \int_{\frac{1}{t}}^{t} -x \, dx + \int_{\frac{1}{t}}^{t} t \, dx + \int_{\frac{1}{t}}^{t} \frac{1}{t} \, dx - \int_{\frac{1}{t}}^{t} \frac{1}{x} \, dx
   \]
   Evaluating each integral separately:
   \[
   \int_{\frac{1}{t}}^{t} -x \, dx = -\frac{x^2}{2} \Bigg|_{\frac{1}{t}}^{t} = -\frac{t^2}{2} + \frac{1}{2t^2}
   \]
   \[
   \int_{\frac{1}{t}}^{t} t \, dx = t \left( t - \frac{1}{t} \right) = t^2 - 1
   \]
   \[
   \int_{\frac{1}{t}}^{t} \frac{1}{t} \, dx = \frac{1}{t} \left( t - \frac{1}{t} \right) = 1 - \frac{1}{t^2}
   \]
   \[
   \int_{\frac{1}{t}}^{t} \frac{1}{x} \, dx = \ln x \Bigg|_{\frac{1}{t}}^{t} = \ln t - \ln \left( \frac{1}{t} \right) = \ln t + \ln t = 2 \ln t
   \]
   Combining these results:
   \[
   S_{PQ, \text{curve}} = \left| -\frac{t^2}{2} + \frac{1}{2t^2} + t^2 - 1 + 1 - \frac{1}{t^2} - 2 \ln t \right| = \left| \frac{t^2}{2} - \frac{1}{2t^2} - 2 \ln t \right|
   \]
   Therefore, the area \( S \) is:
   \[
   S = \frac{1}{2} \left| t^2 - \frac{1}{t^2} \right| - \left| \frac{t^2}{2} - \frac{1}{2t^2} - 2 \ln t \right| = 2 \left| \ln t \right|
   \]

4. **Expressing the volume \( V \) in terms of \( t \):**

   The volume \( V \) of the solid generated by rotating the region around the \( x \)-axis is given by:
   \[
   V = \left| \int_{\frac{1}{t}}^{t} \pi \left( \frac{1}{x} \right)^2 dx \right| = \pi \left| \int_{\frac{1}{t}}^{t} \frac{1}{x^2} dx \right|
   \]
   Evaluating the integral:
   \[
   \int_{\frac{1}{t}}^{t} \frac{1}{x^2} dx = -\frac{1}{x} \Bigg|_{\frac{1}{t}}^{t} = -\frac{1}{t} + t
   \]
   Therefore:
   \[
   V = \pi \left| t - \frac{1}{t} \right|
   \]

5. **Finding the limit \( \lim_{t \to 1^-} \frac{S}{V} \):**

   Using L'Hôpital's rule to evaluate the limit:
   \[
   \lim_{t \to 1^-} \frac{S}{V} = \lim_{t \to 1^-} \frac{2 \left| \ln t \right|}{\pi \left| t - \frac{1}{t} \right|}
   \]
   Since \( t < 1 \), \( \left| \ln t \right| = -\ln t \) and \( \left| t - \frac{1}{t} \right| = \frac{1}{t} - t \):
   \[
   \lim_{t \to 1^-} \frac{2 \left| \ln t \right|}{\pi \left| t - \frac{1}{t} \right|} = \lim_{t \to 1^-} \frac{2 (-\ln t)}{\pi \left( \frac{1}{t} - t \right)}
   \]
   Applying L'Hôpital's rule:
   \[
   \lim_{t \to 1^-} \frac{2 (-\ln t)}{\pi \left( \frac{1}{t} - t \right)} = \lim_{t \to 1^-} \frac{2 \left( -\frac{1}{t} \right)}{\pi \left( -\frac{1}{t^2} - 1 \right)} = \lim_{t \to 1^-} \frac{2 \left( -\frac{1}{t} \right)}{\pi \left( -\frac{1}{t^2} - 1 \right)} = \frac{2}{\pi}
   \]

The final answer is \( \boxed{ \frac{2}{\pi} } \)