- #1

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Please guide me to calculate the resultant of the following two 3D vectors.

vec1 =(-0.3960i,4.6660j,15.2610k)

vec2 =(-4.1230i,-13.2200j,17.9170k)

Thanks

Suneyna

- Thread starter suneyna
- Start date

- #1

- 5

- 0

Please guide me to calculate the resultant of the following two 3D vectors.

vec1 =(-0.3960i,4.6660j,15.2610k)

vec2 =(-4.1230i,-13.2200j,17.9170k)

Thanks

Suneyna

- #2

HallsofIvy

Science Advisor

Homework Helper

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The "resultant" or sum of the vectors ai+ bj+ ck and ui+ vj+ wk is just (a+ u)i+ (b+ v)j+ (c+ w)k.

- #3

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I calculated the resultant in the same way as you mentioned.

Now I want to ask you that is it possible that two 3d vectors pointing downwards (but both didn't lie in the same plane) can have their resultant in upward direction.

- #4

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What do you mean by two 3d vectors not lying the the same plane? As far as I know, any two vectors must lie on the same plane (if all vectors point from the origin).Now I want to ask you that is it possible that two 3d vectors pointing downwards (but both didn't lie in the same plane) can have their resultant in upward direction.

- #5

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vec1 =(-0.3960,4.6660,15.2610)

vec2 =(-4.1230,-13.2200,17.9170), both originated from origin (0,0,0) and the resultant is: res =(-4.5190,-8.5540,33.1780)

So, am i calculating the resultant in the right way?

I am pretty confused with their (above two vectors and resultant) directions.

- #6

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- #7

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Similarlily, I calculated vector 2 as vec2 =(-4.1230,-13.2200,17.9170), I know it is also, originated from origin so from the magnitude itself you can draw this vector too.

Now, I am thinking that the resultant vector res =(-4.5190,-8.5540,33.1780) should lie in between these two vectors, originating from origin and should points downwards as seen in above two (but not sure).

I am confused as this seems to be correct in 2d but for 3d i m not sure.

So I want your suggestion to be sure that i am working in right direction or not?

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