Situation $16.$ The section of a solid concrete beam is shown in the Figure. Unit weight of concrete is $23\mathrm{.}5k\frac{N}{m^3}*f_c^{\text{'}}=27\mathrm{.}5$MPa, $f_{ct}=2\mathrm{.}75$Mpa. The beam is simply supported over a span of $5m.$

$42.$ What is the cracking moment of the hoam in $kN-m?$

A$.46\mathrm{.}32$

B$.62\mathrm{.}25$

C$.72\mathrm{.}15$

D$.5555$

$43.$ If the cracking moment of the beam is $40kN-m,$ what is the maximum superimposed uniform load can the beam carry?

A$.8\mathrm{.}86k\frac{N}{m}$

B$.9\mathrm{.}65k\frac{N}{m}$

C$.7\mathrm{.}54k\frac{N}{m}$

D$.14\mathrm{.}36k\frac{N}{m}$

$44.$ If the beam is reinforced with $3-25-$mm$-$diameter bars placed $435mm$ from the top, what is the new cracking moment? Consider contribution of the steel bars on strength. Use $n=8.$

A$.71\mathrm{.}45k\frac{N}{m}$

B$.65\mathrm{.}22k\frac{N}{m}$

C$.68\mathrm{.}57k\frac{N}{m}$

D$.60\mathrm{.}87k\frac{N}{m}$

SITUATION $15.-$ A building has the following floor weights, $W_1=1500kN,W_2=1300kN,W_1=1200kN$ and $W_4=1050kN.$ Design bwe shear, $V=890kN.$ Each storey height $-3\mathrm{.}1$ meters.

$45.$ If the period of the building is $T=0\mathrm{.}5$ seconds, determine the