- #1
MPat
- 15
- 1
Homework Statement
A 15 000kg loader traveling east at 20km/h turns south and travels at 25km/h. Calculate the change in the loader's
a) kinetic energy
b) linear momentum
Homework Equations
ΔKE= 1/2mvf^2 –1/2mvi^2
Δp= mv2 –mv1
m= 15000
vi = 20km/h = 5.56m/s
vf= 25km/h = 6.94m/s
The Attempt at a Solution
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Part A I think I got.
Part B is where I am confused.
I am using Δp= mv2 –mv1
I substitute the numbers in
Δp= 15000*6.94 -15000*5.56
The magnitude of Δp that I arrive at is equal to 20 700...is that correct?
Also, when I am trying to find the change in direction when subtracting vectors you simply add the opposite direction. so rather than using east, i add my vector pointing south and add the initial vector but pointing west?
I then use this to calculate the angle for the direction. Is this right?
I tried to add an image to show you my diagram...but can't seem to figure out how!
Thanks in advance!