Thursday
August 21, 2014

Posts by mouse


Total # Posts: 32

Physics
Thanks Jack Package :) My job here is done :D
November 2, 2013

Physics
so, t12 is just pi*sqrt(m/k) really? :/
November 2, 2013

Physics
yes. convert everything to basic SI units.... HAS ANYBODY got t12? :/
November 2, 2013

Physics
Someone help with the t12? Please?
November 2, 2013

Physics
Phy? F(t)=m*a_x(t)=-F0+(t/ts-1)*F1 =>ax(t)=-F0/m+(t/ts-1)*F1/m integrating from 0->t vx(t)-vx(0)=-F0/m*t+(t^2/(2*ts)-t)*F1/m you get Vo from here by putting t=0. Now, Vx(t)=Vx(0)-F0/m*t+(t^2/(2*ts)-t)*F1/m Integrating between 0->t We get x(t)-x(0)=Vx(0)*t-F0/m*t^2/2+(...
November 2, 2013

Physics
The soln is simple. Try and read and understand it? It's too large to explain! can you guys give me t12?? solve the equation I gave: 1/2*k*(x_1)^2=(mu_k)*m*g*d
November 2, 2013

Physics
if you want to know how to solve the airliner problem.... since I can't input the link here... just type exactly this - "mit ocw 8.01 Airliner wheels locked landing" in google. Click on the first link... the link will be ending with something like ..../...
November 2, 2013

Physics
KS. The mod(x_2-x_1) is actually really simple. All you need to do is this... 1/2*k*(x_1)^2=(mu_k)*m*g*d solve for d.... your d value will come equal to your x1...the magnitude I mean. This means the body starts moving and comes to rest at x_0=0 itself. :D So, your mod(x_2-x_1...
November 2, 2013

Physics
How does one get t_12 of the mass-spring system sum? I've got the other parts, for all other sums in case anybody needs help! :)
November 2, 2013

Physics
And guys, those of you who're not interested in the math portions. Let's be honest, Lewin's lectures are the important bit for you. It's difficult to maintain the honour code and get certs if you're not happy with math. I think, just watching Lewin's ...
November 2, 2013

Physics
Phy... your k is 40... F0 is obviously 0. I wasn't telling you because I thought it'd help you learn how to use wolfram better. Alas... Somebody help me with the Mass Spring sum? Everything else i've finished off :)
November 2, 2013

Physics
now type in F(x) in wolfram alpha... you'll get 3 roots... 1)x=0 and 2 more equal roots with opposite signs. the positive root must be chosen. Now in wolfram alpha type in Talyor Expansion( and type in your F(x)) at x=the positive root. the second term's coefficient is...
November 2, 2013

Physics
λ/4*(4*x^3-4*a^2*x)-b*x just input your values and solve for x.... the positive x0 value is the one required phy...
November 2, 2013

Physics
I'l give you the answers... but ask yourself, are you learning anything at all if you just fish for answers from strangers? Most of us come here if we get stuck!! F0=0,k=80...do try to find out T on your own?
November 2, 2013

Physics
no. Your equations are all messed up. U(x)=λ/4*(x2−a2)2+(b/2*x2) =>U'(x)=F(x)=λ/4*(4*x^3-4*a^2*x)-b*x Now using your lambda,a,b values: U'(x)=3x^3-40x hence: your roots are 0, 3.651483717, -3.651483717
November 2, 2013

Physics
are you sure about your x0? I'm getting x0=3.651483717 for you...
November 2, 2013

Physics
Some help with mass spring??? Please? ANd Pendulum??? See, for the mass spring problem... a)u_s*mg=kx1.... solve for x1.... but I'm not getting the other answers :(
November 2, 2013

Physics
Block on rotating disk is easy - I got option (a) :) solve for v: mv^2/R=umg....
November 2, 2013

Physics
give me your a,b,lambda values....
November 2, 2013

Physics
ss01 look.... its quite simple.... F0... comes to 0 for mine... and to get k, do the following: Since I don't know the values of a,b,lambda you have... F(x)=dU(x)/dx now type in F(x) in wolfram alpha... you'll get 3 roots... 1)x=0 and 2 more equal roots with opposite ...
November 2, 2013

PHYSICS(HELP)
Troll.... what's the angle of launch for the projectile??? like, suppose the string was cut at and angle alpha=70degrees, the launch angle is 70 degs too???
November 1, 2013

PHYSICS(HELP)
?????
November 1, 2013

PHYSICS(HELP)
ss01... tell me the answers/formulae for pendulum??? Block on rotating disk is easy - I got option (a) :) solve for v: mv^2/R=umg....
November 1, 2013

PHYSICS(HELP)
Listen... guys, I can help with all the problems barring the airliner, pendulum and mass-spring.... please let me know if you guys need any of the other answers and if you have solutions to the problems I'm stuck on?
November 1, 2013

PHYSICS(HELP)
The formula for the meteorite problem is: KE(initial)=KE(final) - GMm/(Radius of Earth) Can somebody please help with the aeroplane landing and Pendulum problems? :(
November 1, 2013

english
I thank you! I'm a non nativ speaker and really don't know what to do with that!
October 26, 2012

english
It's in my textbook... I think it had to be somethink with "But for..."
October 26, 2012

english
But have to stand at the beginning. That is what confused me...
October 26, 2012

english
Hey how can I say the sentence: "If you hadn't helped me, I would have made a complete mess of this." With the same meaning beginning with "But"??
October 26, 2012

english
thank you very much :)
October 26, 2012

algebra 2
solve this equation by using the quadratic (3x)^2-12(3x)+27=0
February 16, 2012

health
are they talking about all contract or just one I am a little confused
March 17, 2010

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