Recent content by joker2014

and of course my iniital conditions would be y(0)=-6 y'(0)=1

of course 8 lbs is weight, dividing by 32 gives me .25 which is my mass! damping i believe is given in the problem "damping constant of one" .. otherwise if not given i would find it by sqrt of 4*m*k

Homework Statement After a mass weighing 8 pounds is attached to a 5-foot spring, the spring measures 6.6 feet. The entire system is placed in a medium that offers a damping constant of one. Find the equation of motion if the mass is initially released from a point 6 inches below the...

it didnt, otherwise i wouldn't ask here... you could have did me favor and explained rather than asking me a non sense question.. thank you anyways.

Homework Statement 4-70 Two couples act on the beam. If F=125 lb. determine the resultant couple moment. Homework Equations M=Fd The Attempt at a Solution I know CW is + and CCW is - ...and that is determined in the final answer, I know the solution is taking Forces times the distance...

I understand now after doing 99999 researches and watching 9999 videos... and easier and simple is to take AB for example, find points A and B, then subtract A-B and BINGO!

I don't get it

It statics, I am having difficulty on getting perfect to read the dimensions correctly in order to find the forces! This photo for example I put B = (-3i,-2j, -6k) but correct answer is (3i,-2j,-6k) ... why 3i but not 3i ?! I'm reeally confused For C I put -1i but correct answer is 3i...

well using the concept of "use sine for side opposite to angle" .. then Id say Fx=30sin30 and also Fy=30sin30 ... becausee I take the side and it turns out to be opposite to the angle... this is how I'd solve it and its wrong anyways

I know this and memorized this, even using SOH CAH TOA,, but I can't apply it to the problems I am getting now

can you explain your concept using the attached image pls?

Homework Statement I have the solution and everything, I'm just confused why they use cos for Fy and sin for Fx ... Homework Equations I've always known Fx=Fcos and Fy=Fsin .. but now I am getting to different problems and it confuses me The Attempt at a Solution I read many posts and answers...

Homework Statement substitute the given power series below into ODE y'' -4y=0 to verify it is a solution Homework Equations y=∑ 2n xn / n! n=0 y''-4y=0 The Attempt at a Solution I have absolutely no idea how start.

I have an exam in 2 days and I am still getting confused on how to find yp , the particular solution. for example y''+ 4y = 9te^t+ 4 or tsin(2t) + 2 Is it only by guessing and that's it? I still can't answer these questions 100% correctly. I would like to have your advises to find the best...

Hello. I've been solving power series problems where the question asks to find 2 power series solutions. I can solve it almost all, I can find the recurrence solution... however while checking the solutions, I see some answer solutions they used c0=1 and c1=0 to find the 2 solutions, and some...