9.6 Example 6

If the tension in the cable BC is 155 N, what are the reactions at A? (The mass of the beam is 3 kg and its center of mass is 75 cm from A).

Solution with FisicaLab

Select the group Static and, inside this, the module Static of solids. Erase the content of the chalkboard and select the SI system. And add one element Stationary reference system, one element Beam, three elements of beam and the necessary elements Force and Couple, as show the image below:

The Stationary reference system set the gravity value to default. Now to the element Beam, that we call Beam:

Name

Beam

m

3

lc

75 @ cm

ang

0

To the element of beam at side A, we have:

Name

Beam

l

0

And to the forces and couple applied, all unknown data, we have:

f

Ry

f

Rx

M

M

To the element of beam where the mass is hanging:

Name

Beam

l

0.9

And to the applied force, the weight of the mass (18 kg*9.81 m/s2 = 176.58 N), we have:

f

176.58

And to the element of beam that represent the right side:

Name

Beam

l

1.3

And to the applied force by the cable:

f

155

ang

35

Now click in the icon Solve to get the answer:

Ry = 117.106 N ;  Rx = 126.969 N ;  M = 65.419 N*m ;
Status = success.