(Solved): As shown, a submarine hatch door is to be opened by applying two opposititly oriented forces of eq ...

As shown, a submarine hatch door is to be opened by applying two opposititly oriented forces of equal magnitude $F=40.0\mathrm{lb}$ at points $A$ and $B$ on the hatch door wheel. The radii of the wheers inner and outer rings are $r_1=1.10\mathrm{ft}$ and $r_2=0.60\mathrm{ott}$, respectively. ( (iigure 1 ) Calculate the moments $M_{\mathrm{A}}$ and $M_{\mathrm{B}}$ about point $D$ for the forces applied at points $A$ and $B$. Then, determine the resulting couple moment $M_{\mathrm{R}}$. Learning Goal: To be able to calculate couple moments. A couple is defined as two parallel forces, separated by a distance, that have equal agnitudes but opposite directions. A couple only produces a rotation in a specified Express your answers numerically in pound-feet to three significant figures separated by commas. magnitudes but opposite directions. Acouple only produces a rotation in direction. The moment produced by a couple is called a couple moment. - Part $\mathrm{B}$ Calculate the moments $M_A$ and $M_B$ about point $A$ for the forces applied at points $A$ and $B$. Then, determine the resulting couple moment $M_R$. Assume that a positive moment produces a counterclockwise rotation whereas a negative moment produces a clockwise rotation. Express your answers numerically in pound-feet to three significant figures separated by commas. Figure