- #1
Matthew R
- 7
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Thread moved from the technical PF forums so no Homework Help Template is shown
Hi guys.
I am currently stuck on the classic snow plow problem. I have the following differential equation and initial conditions:
@ 7am plow starts off to clear snow at a constant rate
By 8am, plow has gone 4mi
By 9am, plow has gone an additional 3mi
Let t=0 when it started to snow, when did it start to snow. They gave the answer as 4:27am
k(dx/dt)=1/t
It wants me to find the constant k.
Here is my work:
∫k dx= ∫dt/t
kx +C = ln (t) At this point I am assuming that x is the independent variable and t is the dependent variable.
e^(kx) +C = t
Using the first initial condition of when it starts to snow of x(0)=0, I get the C is 0, therefore
e^(kx) = t. Using the second initial condition @8, x(t+1)=4
e^(4k)= t+1.
This is the point I get stuck. I can't seem to solve for k that has a real number.
Any help would be appreciated.
I am currently stuck on the classic snow plow problem. I have the following differential equation and initial conditions:
@ 7am plow starts off to clear snow at a constant rate
By 8am, plow has gone 4mi
By 9am, plow has gone an additional 3mi
Let t=0 when it started to snow, when did it start to snow. They gave the answer as 4:27am
k(dx/dt)=1/t
It wants me to find the constant k.
Here is my work:
∫k dx= ∫dt/t
kx +C = ln (t) At this point I am assuming that x is the independent variable and t is the dependent variable.
e^(kx) +C = t
Using the first initial condition of when it starts to snow of x(0)=0, I get the C is 0, therefore
e^(kx) = t. Using the second initial condition @8, x(t+1)=4
e^(4k)= t+1.
This is the point I get stuck. I can't seem to solve for k that has a real number.
Any help would be appreciated.