- #1
emmy
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Homework Statement
A 12 kg brick moves along an x axis. Its acceleration as a function of its position is shown in Fig. 7-37. What is the net work performed on the brick by the force causing the acceleration as the brick moves from x = 0 to x = 5.2 m?
http://edugen.wiley.com/edugen/courses/crs4957/art/qb/qu/c07/fig07_37.gif
Homework Equations
W=integral from xo to x Fxdx + integral yo to y Fydy...
The Attempt at a Solution
Since acceleration isn't constant we can't use W=Fd, so:
Statement of known values:
xo= 0 m
x=5.2 m
m=12 kg
a(5.2)=13 ms-2 (from the graph.. determined by 4m/10ms-2=5.2m/x)
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Unknown/want to find:
Wnet
So using the integral formula (can we assume it's only moving in the x direction?)
W=[integral]F(x)Δx
I'm at a loss though, in the example done in class, he broke the forces up into components, but I can't really do that here since acceleration isn't constant and force is what I'm solving for...