Recent content by kyu

Homework Statement https://www.physicsforums.com/attachments/197474 Homework Equations 3. The Attempt at a Solution [/B] ma + kx = 0 I know how to do it if the spring is in the middle of the pulley, not using energy method. by the free body diagram. But I am stuck at this. [Updated: I know...

i added it.. then what should i do next? no idea how to find the inverse

Homework Statement Ds + E / (s^2 +1)^2 Homework Equations The Attempt at a Solution Ds / (s^2 +1) + E / (s^2 +1) D[s/(s^2 + 1)^2] + E [1 / (s^2 + 1)^2]

Homework Statement since it's asking us to find the moment of inertia with respect to y-axis, why did they draw the differential element to x-axis? Homework Equations The Attempt at a Solution because of the initial problem.. i don't know how to start.. so dA = x dy I(y) =...

Homework Statement Homework Equations i have done till the 2nd final step how is it possible to get the final answer y = -2x - 2/7 + ce^(-7x) why is it ce^(-7x) and not c/e^(-7x)? The Attempt at a Solution

oops i forgot the minus sign.. what should i do after that?

how should i go on?

should be wrong but here goes dh/dt = -k h^(1/2) 1/h^(1/2) = -k dt ln 9 - ln 64 = k ln |9/64| = k ln 0 - ln 64 = ln |9/64| (t-0)

i got k = ln |9/64| then how can the next step using ln 0 doesn't make sense. what should i do?

what method should i use? i tried u = x - 4 du = dx i can't continue. enlighten me please

-2 ln |20-2h| = kt + c kinda lost. solving (i) would be enough for me