Question

e1205[dot]hizliresim[dot]com/x/z/78wcx.png

can anyone look at it please

Answer 1

ω1 =sqrt(k1/m) =sqrt(1270/0.27) = 68.6 rad/s

f1 = ω1/2•π = 10.9 s^-1 =10.9 Hz.
ω2 =sqrt(k2/m) =sqrt(1690/0.27) = 79.1 rad/s
f2 = ω2/2•π = 12.6 s^-1 =12.6 Hz.

1/k =1/k1 +1/k2.
k = k1•k2/(k1+k2) = 1270•1690/(1270+1690) =725 N/m.
ω =sqrt(k /m) =sqrt(725/0.27) = 51.8 rad/s
f = ω /2•π = 8.25 Hz.