# vector

1. ### What is the correct formula to calculate the angle of vector A = 0i + 1j

I know the angle is 90 degrees. and the formula to calculate the angle of vector A is inverse tan of (Ay / Ax), but Excel returns an error message because Ax is zero. Thanks.
2. ### unknown vector of a closed space

can someone please verify my workings, see attached pdf and image thanks Ross Alexander Blenkinsop Perth Western Australia
3. ### Vector

How to solve Q3.
4. ### Vector magnitude

Two forces, each equal to P, act at right angles. Their effect may be neutralized by a third force acting along their bisector in the opposite direction with a magnitude of___________ in this diagram, the resultant vector is the opposite direction, So what should I do the addition of vector or...
5. ### Vector

If the vector A = 2iˆ+4jˆ and B = 5iˆ+pjˆ are parallel to each other, the magnitude of B is____________ how to solve it?
6. ### Angle of space motion and radial-velocity vector

Hello So I am trying to figure out the angle of a space motion vector with its radial velocity vector. I have to sample equations, but despite plugging in the numbers I am not getting the same answers. So I have: tan-1((4.74d(u")/(vr)) With: d = 5.14 pc u" = 0.66092" vr = -26.3km s-1...
7. ### Area vector

In case of motional emf , if direction of magnetic field is perpendicular to the page of the paper and going into it and and a conductor is moving perpendicular to it. Then what will be direction of area vector and how ?
8. ### What is the difference between a vector and a scaler in 1 dimension.

Lets say we have -10 as a vector and we have a scalar also having value -10 in one dimension. So whats the difference?
9. ### Why is the product of a scalar and a vector, a vector?

Refer the title.
10. ### QFT T-duality, Massless vector states

1. The problem statement, all variables and given/known data Part C) Please on first attachment 2. Relevant equations above,below 3. The attempt at a solution so I think I understand the background of these expressions well enough, very briefly, changing the manifold from $R^n$...
11. ### QFT T-duality, Massless vector states

1. The problem statement, all variables and given/known data Part C) Please: (attachment 1) 2. Relevant equations above,below 3. The attempt at a solution so I think I understand the background of these expressions well enough, very briefly, changing the manifold from $R^n$...
12. ### Finding a position vector of a pivot on a lever from its torque

Hi guys, I have a problem here which I'm really stumped on. I have a rigid rod of 3.1m length, with two equal masses at either end. The pivot is placed so that the total torque is 25k N.m about the pivot, and I need to find it's location. I've drawn a diagram, a basis, calculated that the...
13. ### Finding dipole moment vector / Electric Field problem

Numbers 3 and 4 from the included image are giving me some issues. Help?
14. ### Vector Airplane Problem

Can someone help me with this problem? I just want to make sure my answers are correct. 4. A bird wants to fly to a tree 450 km away (to the east). The bird flies at 300 km/hr, during the time the bird is in flight a wind blows toward the south west at 25 km/hr i. Will the wind effect the...
15. ### Vector and direction

Suppose you walk 17.0 m straight west and then 39.0 m straight north. How far are you from your starting point? What is the compass direction of a line connecting your starting point to your final position? (N of W ) The first question is easy to answer. It is 42.5m. But the second is...
16. ### Eigen Vector for Photon

I know that the spin matrix for the photon represents the photon's intrinsic angular momentum. Does the eigenvector for the photon's spin matrix represent something as well? It seems to me that it would be natural to think of it as giving the intrinsic angular velocity of the photon. But I...
17. ### just can't get the vector right on this one

so here we are with vector; Ax + Bx = Cx fine. vector B is 2 times vector A fine. Bx should = (2A)cos(theta) fine. Cx is 350(Newtons)x + 0y..........straight up the x axis B is 25 Degrees west of north ok what is the magnitude and direction of A...? how do I arrive at; (2A)sin(25) =...
18. ### Hilbert space norm of vector invariant in different coordinate systems

Thank you for the help so far. I feel I am learning a great deal. The fourth problem of the attached problem set states let Psi be a complex-valued wave function for a particle in 1-D and gives its Fourier transform. The question asks to prove that the integral from negative infinity to...
19. ### Vector Help

An object is subjected to two displacements. The displacement vector of the first, V1 , has a magnitude of 186 m at an angle 23° North of East. The second displacement vector, V2 , has a magnitude of 327 m at an angle 43° West of North. Draw a diagram and find the magnitude and direction of...
20. ### Why is work not a vector?

I know force is a vector and force times distance times cosmos angle equals work. Thanks Physics forum!