Recent content by smashX

Thanks grzz, that REALLY helps. I think I finally understand now.

Thanks, but I thought Fk having a negative sign was just from the diagram for this case? I mean Fk is pointing upward, right? Since I chose downward as positive, mg-Fk = 0, then I substituted Fk for -ky and got the wrong answer. I kind of get your explanation, but I'm still confused... I'm...

Homework Statement I am currently doing some Hooke's Law problems. While I do not have any trouble with any exercise in particular, I do have trouble with the sign in the equation. Let's say I have a vertical spring and I attached a hanging mass m to it. The string will then stretch a distance...

OK I got it now, it will be 4.5 in the end and reached the same result as above Thank you so so much. I spent half yesterday doing this but it got to nowhere T__T . Really appreciated

I think it is vavg = (vf + vi) /2 = (-6+0)/2 = -3 t = (vf - vi)/a = 0-(-6) / 4 = 1.5s Then s = |vavg| * t = 3 * 1.5 = 4.5m The total distance will be : 2*4.5 (because it goes back and forth twice) + 13.5 = 22.5m Is it... correct, tiny-tim?

OK... so I draw a straight-line out and figure out that we need to find the distance from when the car is at -6m/s to 0 and then back to the position when it was at -6m/s again. That was 0 in the displacement computation... plus the 13.5 I will get the total distance right? Somehow I get the...

Total time traveled? I got that as 4.5s and then I'm still stuck :( Thanks tiny-tim but at the same time, sorry too, I still don't get it.

Homework Statement An object moves with constant acceleration 4.00 m/s2 and reaches a final velocity of 12.0 m/s. a) If its initial velocity is 6.00 m/s, find its displacement and the distance it travels b) Same question as above instead its initial velocity is now -6.00 m/s Homework...

Homework Statement Given a n-sided polygon. Divide it into multiple small triangles that have same radius r. Compute the following limits: Homework Equations The Attempt at a Solution When I plug in a random number to guess the answer, somehow it is always near 0 (very small) so...

I see, so my results were wrong after all hmm I tried to differentiate again but I didn't find any errors. Any other suggestions please, thank you.

Thank you very much for your clear suggestion. Actually, I don't know what in the world is partial differentiation (I'm just in my first semester of calculus ^^), so I just googled it and I get it now. Basically, I think it looks just like implicit differentiation. Anyway, after doing as you...

Hi everyone. I've got a homework problem with Differential Calculus that drives me crazy for a couple of days so far and would like to ask you guys for a few suggestions Homework Statement Given two parabolas, (C1): y = x2 and (C2): y = - (4-x)2. Find two points, each point on one parabola...