For $ n \equal{} 1,\ 2,\ 3,\ \cdots$, let $ (p_n,\ q_n)\ (p_n > 0,\ q_n > 0)$ be the point of intersection of $ y \equal{} \ln (nx)$ and $ \left(x \minus{} \frac {1}{n}\right)^2 \plus{} y^2 \equal{} 1$.

(1) Show that $ 1 \minus{} q_n^2\leq \frac {(e \minus{} 1)^2}{n^2}$ to find $ \lim_{n\to\infty} q_n$.

(2) Find $ \lim_{n\to\infty} n\int_{\frac {1}{n}}^{p_n} \ln (nx)\ dx$.
1. To find the point of intersection \((p_n, q_n)\) of the curves \(y = \ln(nx)\) and \((x - \frac{1}{n})^2 + y^2 = 1\), we start by setting \(y = q_n\) and \(x = p_n\). Thus, we have:
   \[
   q_n = \ln(np_n) \implies p_n = \frac{1}{n} e^{q_n}
   \]
   Substituting \(p_n\) into the circle equation:
   \[
   \left(\frac{1}{n} e^{q_n} - \frac{1}{n}\right)^2 + q_n^2 = 1
   \]
   Simplifying the expression inside the parentheses:
   \[
   \left(\frac{e^{q_n} - 1}{n}\right)^2 + q_n^2 = 1
   \]
   This can be rewritten as:
   \[
   \frac{(e^{q_n} - 1)^2}{n^2} + q_n^2 = 1
   \]
   Rearranging to isolate \(q_n^2\):
   \[
   q_n^2 = 1 - \frac{(e^{q_n} - 1)^2}{n^2}
   \]
   Since \(e^{q_n} \geq e\) for \(q_n \geq 1\), we have:
   \[
   1 - q_n^2 \leq \frac{(e - 1)^2}{n^2}
   \]
   Taking the limit as \(n \to \infty\):
   \[
   \lim_{n \to \infty} q_n^2 = 1 \implies \lim_{n \to \infty} q_n = 1
   \]

2. To find \(\lim_{n \to \infty} n \int_{\frac{1}{n}}^{p_n} \ln(nx) \, dx\), we start by changing the variable of integration. Let \(u = nx\), then \(du = n \, dx\) and the limits of integration change from \(x = \frac{1}{n}\) to \(x = p_n\) to \(u = 1\) to \(u = np_n = e^{q_n}\). The integral becomes:
   \[
   n \int_{\frac{1}{n}}^{p_n} \ln(nx) \, dx = \int_1^{e^{q_n}} \ln(u) \, du
   \]
   We can solve this integral using integration by parts. Let \(v = \ln(u)\) and \(dw = du\), then \(dv = \frac{1}{u} \, du\) and \(w = u\). Thus:
   \[
   \int \ln(u) \, du = u \ln(u) - \int u \cdot \frac{1}{u} \, du = u \ln(u) - u + C
   \]
   Evaluating this from 1 to \(e^{q_n}\):
   \[
   \left[ u \ln(u) - u \right]_1^{e^{q_n}} = \left( e^{q_n} \ln(e^{q_n}) - e^{q_n} \right) - \left( 1 \ln(1) - 1 \right)
   \]
   Simplifying:
   \[
   e^{q_n} q_n - e^{q_n} + 1
   \]
   As \(n \to \infty\), \(q_n \to 1\) and \(e^{q_n} \to e\), so:
   \[
   e \cdot 1 - e + 1 = 1
   \]

1. The final answer is \(\boxed{1}\).