Vectors

[kenhung123]

Resolve forces

[dekoyl]

You can re-arrange it in terms of Y and graph it on the calculator. You'll have a

[kenhung123]

But when I do that with calculator, it will have some gap because you graph 2 functions?

[kenhung123]

Thanks!

[TrueTears]

Pretend there is no "gap". The calc is stupid.


A better way is to use parametric equations.

Let and

Thus the equation of the ellipse

In parametric form will be and

Change your calc into Parametric form

y1 type in y

x1 type in x

Graph.

[kenhung123]

Btw, isn't it /2 both sides=16 and 32 nots 4 and 8?

[TrueTears]

Btw, isn't it /2 both sides=16 and 32 nots 4 and 8?

Sorry I just edited before you posted haha

braindead after too much physics >.>

[kenhung123]

Thanks True for your help

[kenhung123]

New question posted..

[GerrySly]

Dude, leave the first post as your original question then post a new question...

This thread confused me.

[THem]

A train accelerating uniformly, attains a speed of 20m/sec from rest in 2 mins. It maintains this speed for 5 mins and is then uniformly retarded to rest in 1 min.

Find the retardation of the train (-20ms-2?)

Find the total distance travelled in 8mins (130m?)

Sketch a velocity time graph of train motion

Based on the question you're wrong, unless you mean seconds. ( 2 seconds, 5 seconds, 1 second, 8 seconds)

[kenhung123]

Thanks

[THem]

x = 56.5
A = -9.8ms^-2
u = ?
v = 0 ( speed is 0 at it's maximum height)
v^2 = u^2+ 2ax
u^2 = 2(9.(56.5)
u =33.28

[kenhung123]

Thanks but how did you know your not meant to anti differentiate accel?

[THem]

you don't really anti-differentiate something unless they tell you the situation
is defined by some equation or some vector.

a = -9.8j ( a = dv/dt)
v = -9.8tj + c

You can't really go any further because you don't know the velocity
at any point in time

Sorry I don't really have a better explanation and I have to go to Physics now ;d, good luck with it.