Tuesday
September 23, 2014

Homework Help: physics

Posted by physics on Friday, July 31, 2009 at 10:56pm.

so I got a question about projectile motion

take the example of shooting of a plastic air rocket into the air and asked to predict its landing point and how high it goes...

ok I know how to do this...

the thing is now were not neglecting air resistence and I don't know what to do...

I know how to prove the derivation of this equation for distance traveled in the x direction

X = Xo + Vo t + 2^-1 a t^2

ok now sense we were once negelcting air resistance I was always told to use this equation because the velocity stays the same and therefore there is no acceleration

X = Xo + Vo t

because the acceleration is zero taking out that whole set of terms

ok now lets not neglect air resistance...

I know I would have to use every component of this equation except for the Xo which we can let be zero

X = Xo + Vo t + 2^-1 a t^2

take out zero term

x = Vo t + 2^-1 a t^2

ok now what???

I obviously have to do something else...
How do I find the acceleration???

We are given the launch angle but have to derive the launch velocity :(

how does the drag force effect motion in the y direction???

I got to use the same equation I know but don't know how to find the acceleartion

also what's the range equation it's something like

x = f (v, /0)

were the "/0" is like a o with a slash mark thingy with it... what does this symbol represent and how do I derive this equation (I just need the start) and what does teh f represent

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