Why are there no moment restrictions shown in the diagram for this case?

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The discussion centers on the absence of moment restrictions in a structural diagram, specifically questioning why moments M_AZ and M_AX are not indicated. It is clarified that the hinge at point C and the bearing at point A prevent any rotational motion, meaning the structure remains stable without additional moment restrictions. The focus shifts to balancing the applied load and reaction forces as the primary concern. The lack of moment restrictions is attributed to the structural configuration that inherently limits rotation. Overall, the structural design effectively eliminates the need for moment restrictions in this case.
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Homework Statement


the whole structure wouldn't turn about x , y, and z direction , am i right ? why there are no moment restriction in this case(bottom) just in the above case , namely M_AZ and M_AX

Homework Equations

The Attempt at a Solution

 

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werson tan said:

Homework Statement


the whole structure wouldn't turn about x , y, and z direction , am i right ? why there are no moment restriction in this case(bottom) just in the above case , namely M_AZ and M_AX

Homework Equations

The Attempt at a Solution

The placement of the hinge at C and the bearing at A pretty much eliminate the possibility of any rotational motion. All that's left is to balance the applied load and the reaction forces.
 
SteamKing said:
The placement of the hinge at C and the bearing at A pretty much eliminate the possibility of any rotational motion. All that's left is to balance the applied load and the reaction forces.
ya , why no sign of restriction of moment are indicated on the diagram ?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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