00:02
In this problem, john and mary are weighing 180 pounds and 110 pounds, respectively.
00:12
We're told that they sit at the opposite end of a 12 -feetter board with a fulcum in the middle.
00:21
Now we have to find the position at which your 80 -pound son, tom, where he sits in order for the board to be balanced.
00:34
So what's going on here? we have the masses of the system being m1, m2, comma, m sub n.
00:52
And these masses are located at x sub 1, x2, dot, x of n.
01:06
And these are located along the x axis.
01:10
So we know the former for the center of mass.
01:15
Now we can find the points of the center of mass...