Recent content by iamtrojan3

OH MY GOD. there goes 20 points that i should of gotten. thank you for the helpe.

Homework Statement this problem was on my finals and i stared at it for 30 mins straight and still didn't figure it out and now it just bothers me that i don't know how to do the first problem on my final exam. "find the general solution to the dfq" xy'+xy= 1-y Homework Equations...

Thanks a lot HallsofIvy, it seems i just subbed in wrong for y''p and the "c" ended up canceling out anyways.

thanks for responding, Let's see if i have the yp's correct yp = (At^2+Bt+c)e^-t y'p = (2At + B)e^-t -(At^2+Bt+c)e^-t y''p = 2Ae^-t - (2At + B)e^-t - (2At+B)e^-t -(At^2+Bt+c)e^-t

Homework Statement Find the general solution to the diff equation using undetermined coefficients y''-2y'-3y = 3te^-1 Homework Equations The Attempt at a Solution r^2 - 2r -3 = 0 r = -1, 3 so y = c1 e^-t + c2e^3t + yp since e^-t already exists as a solution, i have to...

Homework Statement Find y2 given t^2y'' + 3ty' + y = 0 y1(t) = 1/t Homework Equations The Attempt at a Solution i found y, y' and y'' and plugged it back into the Differential equation, after doing some work, I'm basicly down to tv''+v' = 0 where y2 = v/t so u =...

oh wow i thought u could bring the 2 out front... thanks for clearing that up

Homework Statement Solving this differential equation ty' + 2y = t^2 - t + 1 Homework Equations Its linear so i set it up in linear form y' + y(2/t) = t - 1 +1/t The Attempt at a Solution the integrating factor (u) = e ^ integral (ydt) = e^ integral (2dt/t)... Here's the...

Homework Statement There is a large bed floating in sea with the density of 765 kg/m^3. What fraction of the bed's volume will be under the surface of the water? The density of sea water is 1035 kg/m^3. Homework Equations Fb = Density * v * gravity The Attempt at a Solution I know...

I got it! i didn't know that it was still a conservation problem. thanks a lot for the help

oh crap posted wrong part >.< The block's suppose to be "A uniform solid cylinder (m=0.450 kg, of small radius)" and answer's 6.00m/s. Sorry.

Homework Statement A small cube (m=0.450 kg) is at a height of 393 cm up a frictionless track which has a loop of radius, R = 58.95 cm at the bottom. The cube starts from rest and slides freely down the ramp and around the loop. Find the speed of the block when it is at the top of the loop...

Ahh i see what i did thank you all for the help

Ok, now ill sound just plain stupid. How do i find the density of water?

Isn't that what i did? B = Density * V * g and like you said water is fairly constant, so V = B/g which is 34N/9.8 = 3.47 which is the volume of the object, right? So now i can do D = m/v for the density of the object given m of object is 341/9.8. And i just confused myself, we're ignoring the...