$3$ Problems: $(10$ pts each$)$

Textbook problem $3\mathrm{.}77$ : Water at $20C$ flows steadily through a reducing pipe bend, as in Fig. P$3\mathrm{.}77.$ Known conditions are $p_1=350$kPa,$D_1=25cm,V_1=2\mathrm{.}2\frac{m}{s},p_2=120$kPa, and $D_2=8cm.$ Neglecting bend and water weight, estimate the total force that must be resisted by the flange bolts.

ans. $R_x=-14900$Nhat$(i)$