Recent content by cocoavi

I'm sorry I know I should be telling what I've already done.. but I just don't think I'm doing it right and I've just been taking random equations and working on them..~ well.. I did d=vit + 0.5at^2 + 30... to make d=0.5t^2 +30 for the train.. but I have no idea why I did that T_T..

Mmmm if it's not too much of a problem could someone help me with the following question?: A late passenger sprinting at 8.0m/s is 30.0m away from the rear end of a train when it starts out of the station with an acceleration of 1.0m/s^2. Can the passenger catch the train if the platform is...

yes I know that if the question had given me any values at all.. but the problem is, that was what the book has given me.. that's all the information I have.

I had a physics problem which I had some problem understanding. The problem is: You plan a trip on which you want to average 90km/h. You cover the first half of the distance at an average speed of only 48km/h. What must your average speed be in the second half of the trip to meet your...

okay~ thank you! ^_^

um... so say if were to find the instant velocity I would basically just draw a line in the grid through the one point of the graph, then find the slope of that line, and that'll give me the instant velocity of that point. And if I were to find the average velocity between two points...

if I was given a graph, and told to work out the instant and average velocity, do I just find the slope of a tangent for both instant and average velocity? thx~

An ellipse is defined by the equation \frac {x^2}{144} + \frac {y^2}{36} = 1. Determine the equation of the ellipse formed when the original ellipse has undergone a horizontal compression by a factor of 1/2 and a vertical expansion by a factor of 3. I'm not quite sure how to work out the...

ooh~ those helped me understand more ^^. Thank you!

:bugeye: whoa... You're really smart to be able to get all of those... but I'm very sorry to say that I don't think I understand it. When the tutor explained it was very simple, it's just that when I got home and started on the homework that I got all confused... :cry: And since I'm only...

I have been taught that the equation Ax^2 + Cy^2 +Dx + Ey +F = 0 represents a general form of conics. Then the conditions of the coefficients in the equation could identify which type of conics the equation represents... Circle: A=C Ellipse: A does not=C and AC>0 Hyperbola: AC<0 and...