Recent content by hefalomp

How did you find (B) and (C) and also spring at equilibrium point, isn't that when the spring neither is stretched or squeesed (x=0), but how did you get -0.0015m in B?

how did you get teta = 4, should it not be 3,82 ?? when sin-1(13.33/200)=3.82

How did you get 96m/s in c, i believe that is wrong, and how did you find the diff eq. for v(t)

I got tan(θ)/l=(tanθ+h)/d and not tan(θ)/l=tanθ/d+h/d^2, how did you get tan(θ)/d+h/d^2

I have done the same as you is this the right answear? or should it be tan^-1(lh/d(d-l))=Θ, if so what did you change?

So you think if the velocity should add up to be 8,73m/s as if the bike was stationary relative to the earth, the velocity relative to you and the bike should be 8,73=(20km/h)/3.6 * v(youandbike), and solve for v(youandbike) = 3.17m/s ?

Yes, but then the right sides will be: tan(θ) / l) i the first eq. and in the second: (tan(θ) + h ) / d, and when you put these two equal to one another the tan will go away? So how did you then get θ=tan^-1(lh/d(d-l)) ?

I got that v = sqrt((g*5)/(2(tan(theta)*cos^2(theta))) which also gives 8.73m/s, do you think this is the correct answear then?

Well, that's explanes why i got wrong, i searched for the radius and mass of Earth on google, didnt se that they were mentioned in the task :) Now i should get the right answear..

Even when I use your formula i also get 6170 seconds, do you use r = 7271000 , M = 5,97219*10^24 and G = 6.67408*10^-11 ?

Yes, might be that that is wrong then? But you said that (G*M*m)/r^2 is the force and since F=m*a where a=v^2/r you can solve the problem by solving it for v and then setting in the formula for T instead. Can i not use that (G*M*m)/r^2 = m* v^2/r, and solv it for v, then put v in T = 2*pi*r/v ?

Have you managed to do b or c?

I think i figured it out, i used wrong radius, i forgot to add up the radius of the Earth as well :s, i now got 6170 s, is that the same as u got?

Did you get the periode for the object to do one lap equal to 268,7s ?? Felt that this answear was very small, but i got the formula T = 2*pi*r / (sqrt(G*M/r)