Recent content by Jess1986

Two species x, y compete for the same limited food supply according to the model x'=3x-2x^2-2xy y'=4y-3y^2-2xy Find and classify the equilibrium points. Please please can anyone help me with this??

Show that m(2r'a' +ra'')=0 can be rewritten as md/dt(r^2*a')=0 Has anyone got any tips on how i should go about this?? Thanks x

Any got any ideas of how to go around this question? Thanks A car of mass m is moving along a horizontal track with speed U>u[SIZE="1"]c when it runs out of fuel. The retarding force due to air resistance is equal to (i) \mu u^2 for speed u>u[SIZE="1"]c and (ii) \lambda u for speed...

ok thanks for your help x

ive ended up with what looks a complicated expression with many c1,c2,c3...is there an easy way which i can solve for t? thanks

oh yes oh course i forgot to bring the -c3 down, thanks

so is dv/dt= c2e^-c3t??

do i need to integrate this equation to sub this in?

sorry to keep asking questions but what exactly do you mean when you say ' plug it in the diff. eq' which part? how can i do this? thanks

i have got u=c1 + c2 at t=0. how do i find the condition with the exponential in?

ok i see, thanks

i am unsure how to get v(t) = c_1 + c_2 e^{-c_3 t} from the differential eq.?

how do i use v(t) = c_1 + c_2 e^{-c_3 t} to solve this?

Yes i am using calculus. Would a=-(a+bv) be correct?

A particle of mass m moves in a straight line subject only to a resistive force of magnitute a+bv, when the particle's speed is v, where a and b positive constants. If the particle was set moving with initial speed u, obtain formulae for the time taken for it to come to rest and for the distance...