- #1
Feodalherren
- 605
- 6
Homework Statement
The first segment starts at -650 and ends at -1100.
The second segment starts at 1200 and ends at 0.
Homework Equations
dM/dx = V
The Attempt at a Solution
I attempted to break the problem into two parts.
For the first segment:
Skipping a few steps:
w = 100x
dV/dx = -100x
V= -50x^2
This is where my first confusion arises.
If dV/dx = -w
then how can the solutions guide say
Sum of the forces in Y = 0 = -650 - 50x^2 - V
V= -650 - 50x^2
Now I have two things that V is supposed to equal...?!Moving on:
dV/dx = M
M = -650x - (50/3)x^3
So the first segment starts at 0 and ends at -2100 which I got from plugging in x=3 into my moment equation. It is a cubic function that has an increasing negative slope as it approaches x=3.For the second segment:
V = -300x
Sum of the forces in the Y = 0 = -650 +2300 -300x - V
V = 1650 - 300x
M= 1650x - 150x^2
but now I'm not accounting for the first part of the beam. I'm completely lost at this point.