Describe the general traffic pattern when the road whose flow is X4 is closed Solution at point a according to KCL X1+40+X3+X4=0.........(1) at point c 100+X5=X3+X2............(2) at point b X1+X2=200.............(3) at point d X4+X5=60.................(4) when X4 is blocked X5= 60 at point d......(from equation 4) and substitute in equation in (2) from equation 3 we get X1= 200-X2 substitute in in equation 1 the final equation we gt is X3+X2= 160 X3-X2=-240 X3= -40, X2=200 and therefore X1=0.

1. Describe the goal of an experimental research study and identify the two elements that are
necessary for an experiement to achieve its goal.
Solution
An experiment is a methodical procedure carried out with the goal of verifying,
falsifying, or establishing the validity of a hypothesis. Experiments vary greatly in their goal and
scale, but always rely on repeatable procedure and logical analysis of the results. A child may
carry out basic experiments to understand the nature of gravity, while teams of scientists may
take years of systematic investigation to advance the understanding of a phenomenon. An
experiment is a method of testing - with the goal of explaining - the nature of reality.
Experiments can vary from personal and informal (e.g. tasting a range of chocolates to find a
favourite), to highly controlled (e.g. tests requiring complex apparatus overseen by many
scientists hoping to discover information about subatomic particles).
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