# The circle has a radius of r metres and the longer circular arc joining A and B is two times as long as the chord AB. Find the length of the chord AB, correct to 6 d.p. (Hint: Use NewtonRaphson).

# Question 1

The circle has a radius of r metres and the longer circular arc joining A and B is two times as long as the chord AB. Find the length of the chord AB, correct to 6 d.p. (Hint: Use NewtonRaphson).

Question 2

An ancient walled structure, that is assumed to be circular in plan, is required to be surveyed.

Due to its structural instability, it is not considered safe to go inside, or near the structure, and so two survey points P and Q have been established such that P is **A** metres north of the most Northerly part of the structure, and Q is **B** metres east of the most Southerly part of the structure. The points P and Q have been carefully chosen so that the point Q is just visible from point P. (i.e. the line of sight between the two points is tangential to the wall of the structure.

Use this information to find the diameter of the structure by constructing and solving a nonlinear equation.

# Question 3

Using the Euler Numerical Method, solve the following problems:

- The maximum displacement (y mm) of a prestressed concrete beam at a distance
*x*(m) is given by the equation: -

𝑑𝑑𝑑𝑑 2+𝐵𝐵𝑑𝑑2

=𝐴𝐴𝑑𝑑

𝑑𝑑𝑑𝑑

If the initial conditions are *x*_{0 }=0 , and y_{o} = 0, find the maximum value that *x* can have if the maximum permitted displacement is *C*mm.

- A differential equation for relating the spread of a contaminant in a ground contamination investigation is given as:-

𝑑𝑑𝑑𝑑 𝐷𝐷𝑑𝑑+𝑑𝑑

=

𝑑𝑑𝑑𝑑 𝑑𝑑𝑑𝑑

Initially, *x* = 1, and *y *=2, find the value of *y* when *x* = *E*.

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