Geometric object with magnitude (length) and direction.
0
votes
2answers
182 views
So where is mistake in the formula of wave number (magnitude of wave vector)?
I have following form for wave vector $k_2=n_2 \omega/c_0$. Now because $\omega=2 \pi c/ \lambda$, then $k_2=n_2 \omega/c_0=\frac{n_2 2 \pi c_0}{c_0 \lambda}=\frac{n_2 2 \pi}{\lambda}$. But problem is ...
0
votes
0answers
70 views
Vector Calculus - Mass of a block (I'm being dense) [closed]
I'm currently revising for some exams, and as part of one of my practice questions am finding the mass of a block by use of it's mass density function. It involves a triple integration as seen below. ...
0
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0answers
112 views
Vectors and finding lines on a point [closed]
Long John Silver, a pirate, has buried his treasure on an island with five trees located at the following points: A (30.0m, -20.0m), B(60.0 m, 80.0m), C (-10.0m, -10.0m), D (40.0m, -30.0m), and ...
-1
votes
1answer
102 views
Vector Addition — Direction
Say we have three forces $F_1, F_2, F_3$, such that
$$
F_1 + F_2 - F_3 = 0\hspace 10mm (1)
$$
And let us say that $F_1$ and $F_2$ have the same direction and magnitude, and that $F_3$ has double the ...
-1
votes
1answer
51 views
man walking in rain:relative velocity
A man walking in rain at a speed of 3kmph find rain to be falling vertically. When he increases his speed to 6 kmph, he finds rain meeting him at an angle of 45 deg to the vertical. What is the speed ...
-1
votes
2answers
168 views
Simple Vector Problem [closed]
I'm a bit stuck on a homework question that I've been assigned. The question is as follows:
You are paddling a canoe at a speed of 4 km/h directly across a river that flows at 3 km/h. (a) What is ...
-1
votes
1answer
77 views
Determine when a light is going into the object [closed]
Please look at this image: (http://mypages.iit.edu/~smart/acadyear/refract.gif)
How can I determine when light is going into the object?
Actually, if there is, what is the simplest way to ...
-1
votes
1answer
177 views
How to properly find equilibrium vectors when 3 or 4 vectors are present? [closed]
I'm having trouble regarding how to find the equilibrium of vectors. We were given tables with given information and had to fill them in; I'm fairly sure my initial attempts were incorrect.
first ...
-1
votes
1answer
370 views
The acceleration of a particle moving only on a horizontal plane is given by a= 3ti +4tj, [closed]
The acceleration of a particle moving only on a horizontal plane is given by a= 3ti +4tj, where a is in meters per second-squared and t is in seconds.
At t = 0s, the position vector r= (20.0 m)i + ...
-1
votes
1answer
1k views
how to calculate the angle in the x-y, y-z, x-z plane given only 3D vector direction and magnitude? [closed]
Please help me solve this. I have been thinking of all sorts of ways to solve this but can't figure out how :(. Ok here's the problem:
I am given a three dimensional velocity vector (i know the ...
-3
votes
2answers
752 views
How to add two perpendicular 2D vectors [closed]
vector D = 4 cm North
vector J = 4.5 cm West
what is D+J?
In a more general sense, how can two 2D vectors that are perpendicular to each other be added?
-5
votes
1answer
205 views
What is a simple physics application of the reciprocal of a square root? [closed]
I learned yesterday that the inverse of square roots is used to calculate the vectors of surface normals in 3d graphics. It seems like such a mind-bogglingly simple idea, and it leads me to wonder if ...
