A 20.0-m -long uniform beam weighing 830 N rests on walls A and B, as shown in t

ID: 1459330 • Letter: A

Question

A 20.0-m -long uniform beam weighing 830 N rests on walls A and B, as shown in the figure (Figure 1) .

A) Find the force that the wall A exert on the beam when the person is standing at D.

B) Find the force that the wall B exert on the beam when the person is standing at D.

C) Find the force that the wall A exert on the beam when the person is standing at a point 2.0 m to the right of B.

D) Find the force that the wall B exert on the beam when the person is standing at a point 2.0 m to the right of B.

E) Find the force that the wall A exert on the beam when the person is standing 2.0 m to the right of A.

F) Find the force that the wall B exert on the beam when the person is standing 2.0 m to the right of A.

What is the weight of the person?

Ok, so heres the answer:

1. Fa * 12 = 830*5 -> Fa =345.8N {Mom. about B}

2. Fb*12 =830*17 -> Fb =1175.833N {Mom about A}

3. Fa *12 = 830*2 -> Fa =138.33N {about B}

4. Fb *12 =830*14 -> Fb =968.33N {about A}

5. Fa *12 =830*10 ; Fa =691.6N

6. Fb*12 =830*2 ; Fb =138.33N

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