ElectricPavlov

Yeppers.

de nada !

Not sure who told you that, but it is incorrect.....sorry

Hypothetical example:   IF you move 800 east  and then   400 west THEN your displacement would be 800 - 400 = 400       This ONLY works with displacements along a LINE.

You're welcome....good luck with Physics !    

2 inches wide to 8 inches wide is a scale (multiplication ) factor of 4    (because 2 x 4 = 8)

   so the 'tall-ness' has to multiply by this factor also.....

        1.5 in x 4 = 6 inches tall

Total displacement is found using pythagorean theorem

d = sqrt( 800^2 + 600^2) = 1000 km

Direction is given by Tan = opp/adj    =     600/800            arctan (600/800) = 36 .9 degrees

  The top of the sinusoidal wave is 6     the bottom is at  2     ....the average is the midline     (2+6)/2 = 4  

        y= 4 is the midline

Amplitude is the height of the wave from the midline....midline is the x axis.....the wave goes up to 3 from there.....amplitude = 3

For a SYSTEM of equations, graph all of the equations.....where all of the graphs intersect is the solution(s) to the system.

2:   x= 0   is a solution   (put x=0 in to the equations    then f(x) = 1  and g(x) = 1

      x= 1   is a solution      f(x) = 3   g(x) = 3

      x = 3 is NOT a solution for  f (x) = g(x)   because     f(3) = 7   g(3) = 19

The value in the parenthesis can only be between -1  and +1  inclusive.....     cos does not go as high as 11/4....

I assume YOU are travelling on both of the trains....

(Train 1 distance + train 2 distance) / (train 1 time + train 2 time) = average speed

(100 km + 200 km) / ( 1 hr + 1.5 hr)

300 / 2.5 = 120 km/hr  average