Question

The pendulum consists of two slender rods AB and OC which each have a mass of 3 kg/m. The thin plate has a mass of 10 kg/m2. Determine the location of the center of mass G of the pendulum, then calculate the moment of inertia of the pendulum about an axis perpendicular to the page and passing through G.

Answer 1

the answer is below

Step-by-step explanation:

The diagram of the problem is given in the image attached.

Mass of rod AB = (0.4 m + 0.4 m) * 3 kg/m = 2.4 kg

Mass of rod OC = (1.5 m) * 3 kg/m = 4.5 kg

Mass of plate = 10 kg/m²[ (π* 0.3²) - (π* 0.1²)] = 2.513 kg

The center of mass is:

`\hat{y}[2.4+2.513+4.5]=(0.75*4.5)+(2.513*0.5)\\\\\hat{y}=0.839\\\\I_(AB)=(1)/(12)*2.4*(0.4+0.4)^2= 0.128\ kg/m^2\\\\I_(OC)=(1)/(12)*4.5*(1.5)^2= 3.375\ kg/m^2\\\\I_(Gplate)=(1)/(2)*(\pi*0.3^2*10)*(0.3)^2-(1)/(2)*(\pi*0.1^2*10)*(0.1)^2= 0.126\ kg/m^2\\\\I_(plate)=I_(Gplate)+md^2=0.126+2.513(1.8^2)=8.27\ kg/m^2\\\\I_o=I_(plate)+I_(AB)+I_(OC)\\\\I_(o)=0.128+3.375+8.27=11.773\ kg/m^2 \\\\I_G=I_o-m_(tot)\hat{y}^2\\\\I_G=11.773-(9.413*0.839^2)\\\\I_G=5.147\ kg/m^2`