Consider the pin-jointed truss shown in the figure (not to scale). All members have the same axial rigidity, AE. Members QR, RS, and ST have the same length L. Angles QBT, RCT, SDT are all 90°. Angles BQT, CRT, DST are all 30°. The joint T carries a vertical load P. The vertical deflection of joint T is k$\rm \frac{PL}{AE}$. What is the value of k?

An idealised bridge truss is shown in the figure. The force in Member U2L3 is __________ kN (round off to one decimal place).

A plot of speed-density relationship (linear) of two roads (Road A and Road B) is shown in the figure.
If the capacity of Road A is CA and the capacity of Road B is CB, what is $\rm \frac{ C_A}{C_B }$?
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