Trouble Understanding Moment Calculations?

[Permanence]

Hi,

I am having trouble understanding how the signs were obtained in the moment calculation.

When I imagine the 600 N force acting on the moment arm, it moves CW which would give it a negative value. When I solve the problem I end up reviving Ay and Cy values that are swapped with the book.

 

[billy_joule]

When I imagine the 600 N force acting on the moment arm, it moves CW which would give it a negative value.

The 600N force is to the right, that's counter clockwise about point C.

 

[Permanence]

I thought that I'm suppose to draw a line down from C to the line of action of the force. Then apply the force to that line, and imagine (ignore that)

As I'm writing my response I see that it is CCW. I have no idea why I thought it was CW and was so insistent upon that. Thank you for the reply.

 

[billy_joule]

You're welcome