# ResourcesHelp|Close Moment of a Force: Scalar Formulation

1. Sep 16, 2010

### sami23

1. The problem statement, all variables and given/known data
A pipe is anchored to a wall at point A. During the pipe's installation, several forces are applied to the pipe at different locations. If F1 = 14.7 lb, F2 = 18.5 lb, F3 = 12.6 lb, F4 = 10.9 lb, d1 = 0.400 ft, d2 = 0.800 ft, and d3 = 0.800 ft, what is MRA, the net moment about point A due to these forces? Assume that moments acting counterclockwise about point A are positive whereas moments acting clockwise are negative.

2. Relevant equations
MRA = $$\Sigma$$Fd

3. The attempt at a solution
MRA = F1d2 - F2d2 + F3(d3 - d1) - F4d3

not sure about the direction (using the right-hand rule)

#### Attached Files:

• ###### pipe.jpg
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2. Sep 20, 2010

Help!