Why can't I get the answer to this problem?

[RESmonkey]

There. I just did it. I punched myself in the balls.

 

[imported_Tick]

Originally posted by: RESmonkey
There. I just did it. I punched myself in the balls.

Ball punching helps with unit analysis?

 

[PCboy]

Originally posted by: Kyteland
What's the problem? You have the answer right there. All you need to do is divide by the factor of 3600 like Tick mentioned.

163.92/3600 = 0.046 mi

I was just about to say.. so easy.

 

[Kyteland]

Originally posted by: RESmonkey
Wouldn't dividing 163 by 3600 only give you some sort of average of 7 seconds in the 7 hours instead of the precise 7 second distance?

No, if you want to be consistent you can convert everything from mph to mps, but then the constant factor of 3600 can be taken out of the integral

assume that t is in seconds

v(t) = 1.25mph*t^2 + 3 mph
v(t) = 1.25/3600mps*t^2 + 3/3600mps

x(t) = ? v(t) dt
x(t) = ? 1.25/3600mps*t^2 + 3/3600mps dt
x(t) = (1/3600) * ? 1.25mps*t^2 + 3mps dt
x(t) = (1/3600) * ((5/12*t^3 + 3*t)|[7,0])
x(t) = (1/3600) * 163.92

 

[Cyco]

Originally posted by: Tick

Originally posted by: RESmonkey
There. I just did it. I punched myself in the balls.

Ball punching helps with unit analysis?

It only makes sense...although I thought he was going to pluck them. How disappointing.