Register to reply 
Equilibrium question.by kjthesandman
Tags: equilibrium 
Share this thread: 
#1
Nov2307, 08:52 AM

P: 3

I was having trouble calculating the equilibrium of this object. I thought I had to solve it using the scalar cross product...but i'm not certain I am on the right track. Can some one help me? This is the question.
A carpenter's square has the shape of an L, where d1 = 19.0 cm, d2 = 6.00 cm, d3 = 6.00 cm, d4 = 11.0 cm. Locate its center of gravity. (Hint: Take (x, y) = (0, 0) at the intersection of d1 and d4) 


#2
Nov2307, 09:36 AM

P: 196

Can you please draw this carpenter.I'll try to help you.
Like this? 


#3
Nov2407, 06:24 PM

P: 3

Sort of, actually d3 is connected to d1, and d1 is the longer side of the carpenter square. The picture looks more like this...



#4
Nov2407, 06:57 PM

Sci Advisor
HW Helper
PF Gold
P: 6,038

Equilibrium question.
Rather than using cross products, break up the shape into 2 rectangles, and sum moment areas about each axis separately , where the moment of an area is the area times the perpendicular distance from its centroid to the axis, and where
(A1)x1 + A2(x2) = (A1 + A2)(X_), etc., (which you are familiar with?). 


#5
Nov2407, 08:23 PM

P: 3

Well I was using the equation ((m1)(x1)+(m2)(x2))/(m1+m2)= but i keep getting the wrong answer...using this method how do i find y1, y2, and x1, x2. I know it seems like a real fundamental question but I am still having trouble.



#6
Nov2407, 09:40 PM

Sci Advisor
HW Helper
PF Gold
P: 6,038




#7
Nov2407, 11:23 PM

P: 196

Centre of mass is between two centres of mass,so in the red line.Where the red lines coincide,there is the centre of mass of the carpenter.



Register to reply 
Related Discussions  
Equilibrium question  Chemistry  3  
Equilibrium Question  Chemistry  4  
Equilibrium Question  Introductory Physics Homework  1  
An Equilibrium Question  Introductory Physics Homework  5  
Equilibrium Question  Introductory Physics Homework  7 