a)
l=5
m=500kg/m
T=15000+8000=23000N
=0.6782Hz
b)
-15000-8000-25000+yl+yr=0
Here, yl=left support, yr=right support
Taking moments about left support, clockwise positive;
(15000*1)+(8000*2)+(25000*2.5)-(5yr)=0
15000+16000+62500-5yr=0
5yr=93500
Right reaction force,yr=18700N
-15000-8000-25000+yl+yr=0
-15000-8000-25000+18700+yr=0
yr=48000-18700
=29300N
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