need physics help

[sardonicone]

Damnit, I'm late to the party.

 

[needtogetaas]

4.70meters

 

[redguru]

assuming that the rocket keeps moving to the right at 3.0 m/s after launch you first calculate the time it takes for the rocket to travel 20m.

Acceleration is F = MA, 0.5 KG for mass, and Force is 8 N so A is 16-9.8 m/s^2.

So functions for movement are:

a(t) = 16-9.8=6.2
v(t) = 6.2t
p(t) = 3.1t^2

Solve for p(t) = 20

t = 2.5 seconds.

Next question is how far will the cart move to the right in 1.58 seconds?

Answer is 2.5*3 = 7.5 meters.

I realize this might be too late but I wanted to see if I could remember how to do this stuff because I have not seen such problems in years.

I like how you took the derivatives of position and velocity, but I think he is still in a non-calculus based physics.

 

[redguru]

4.70meters

It's 7.5 meters to 2 sig figs.

 

[redguru]

Oh, and Fuck You Samoth. I knew you'd click on this.

 

[juiceddreadlocks]

Oh, and Fuck You Samoth. I knew you'd click on this.

aint that the truth

 

[samoth]

Oh, and Fuck You Samoth. I knew you'd click on this.

God dammit!

 

[Tiervexx]

you forgot to subtract the accel due to gravity from the accel of the thrust, ohhhhhhhhh

Normally they would say "assume the gravity constant of X" or whatever, this problem did not.

I actually thought about that but forgot to make a note of it.

 

[Tiervexx]

I like how you took the derivatives of position and velocity, but I think he is still in a non-calculus based physics.

for me this was always the natural way to do it because I took calc before physics, but I can see how that might be an issue, I never remembered those formulas though =P

 

[gonelifting]

"True"... I mean "False". My answer is "False".


A rocket can NOT loop.