Question

Hey i have tried these questions a few times, can you please show me how you do them with steps? A diagram with the forces on the bridge sections would be nice. Thanks you very much!!!!!!!

4. [lpt] For the bridge shown in the diagram, find the reaction force at A: using the choices given below, enter the magnitudes of the horizontal and vertical components, in this order. E.g., enter dd a) 2F b) FcF/2 d) 3F e) F3 ANA roller roller 5. [1pt] Find the reaction force at B: enter the magnitudes of the horizontal and vertical components. E.g., enter dd

Answer 1

Since they are roller so there will not be any horizontal reaction

So only vertical components will be there

Considering reaction at A is Na vertically upward and reaction at B is Nb vertically upward.

So taking moment about B

F×3l = Na×4l

So Na= 3F/4

So the correct answer is j

Similarly moment about A

So F×l = Nb×4l

So Nb= F/4.

So the correct answer is h