Angles Definition and 911 Threads

  1. E

    How can I find Va given Vo and angle A on a 3D sphere?

    Hi folks, I'm hoping for a little help with something which I'm sure should be pretty easy... but I don't have access to any kind of maths textbooks to look anything up, sadly, so I'm hoping you guys might help? Let's consider a point P on the surface of a sphere, and define Vo as the unit...
  2. Z

    What is coordinate system and how to find angles b/w lines

    hi i want to know what is cordinate system and how to find angle b/w two connected lines
  3. Z

    How Do Aeroplanes Change Direction?

    hi i want to know at what angles aeroplenes move left and rights please if there is any equations related to this provide me
  4. P

    Predicting bond angles of ions/molecules

    -how to predict the bond angles of ions/molecules...how?
  5. M

    Spherical coordinates angles of phi

    im having trouble determining the angles of phi in spherical coordinates when asked to convert a triple integral into spherical, and find the limits of the phi integral. can anybody point out any hints/tips/tricks how this may be done??Please...i have an exam tomorrow and I am tryn to prepare...
  6. B

    Resolving alpha with friction and angles

    a straight footpath makes an angle of aplha with the horizontal. an object P of weight 1250N rests on footpath. the coefficient of friction is 0.1. the least magnitude of a force, acting up the footpath, which will hold the object at rest on the footpath is 50N. by treating the object as a...
  7. J

    Master Compound Angles with Expert Help | Boost Your Trigonometry Skills Today!

    Hey If anyone has time or can point me to a link, I am low in math skills and need to know how to calculate compound angles. I am a 3D animator also and there is a lot of use where Trig. is helpfull but I have no Idea how to figure what any of these things mean or the context in which they are...
  8. P

    Understanding Sine, Cosine and Tangent Angles

    Hi people, what is meant by sine, cosine, tangent angles, apart from their general definition of opp side/ hypo side; adj side/ hyp side and so on? how are these sine, cosines and tangent angles invented by humans?
  9. M

    What if I showed angles DEB and EBC to be equall

    http://img298.echo.cx/img298/2145/pentagon8zw.png ABCDE is a regular pentagon, in the previous question I worked out angle AEB to be 36°.. the next question has asked to prove that BCDE is a trapezium but I don't know how to. I figured it might be to do with showing that the sum of the angles in...
  10. A

    Is the sum of all angles in a triangle always 180 degrees?

    THE SUM OF ALL ANGLES IN TRIANGLE IS 180 DEGREE THE SUM OF ALL ANGLES IN TRIANGLE IS 181 DEGREE ONE OF THE STATEMENT IS FALSE PLEASE IGNORE SPELLING AND GRAMMATICAL ERROR(S) Which statement is false?
  11. O

    Finding the Angles: A Trigonometric Problem

    Find all the angles from 0^{\circ} to 360^{\circ} inclusive which satisfy the equation $ \tan(x-30^{\circ}) - \tan 50^{\circ} = 0
  12. R

    Exploring Quaternions: Angles in 3D Space

    Dear Friends, I've read about quaternions, and they can be expresed in 4 terms or in angles like this: a + ib + jc + kd = cos \theta + \vec{v} sin \theta Quaternions are a generalization of the complex numbers, but in 3D. My question is about angles. For example, with a complex...
  13. L

    Help: Lorentz transform for angles

    Hi everybody, I would need to find the lorentz transform for angles from primed to unprimed system. Could someone help fast? Thanks a bunch, best, Lorentzf
  14. M

    Finding critical angles and index of refractions

    im having trouble setting my TI-83 Plus into "degree mode" so i can't seem to get the answers for these problems...im probably doing them wrong too A material has an index of refraction of 1.75. What is the critical angle for this material? Sin(critical angle)=1/n, n being the index of...
  15. B

    How Is Momentum Conserved in Collisions at Angles?

    So I have ball 'A' with mass 0.10 kg and velocity 1.4 m/s is traveling towards stationary ball 'C' with mass 0.10 kg. Ball 'C' is struck by ball 'A' and shoots off at an angle of 30 degrees to the x-axis, landing on the floor 1.20 meters below. I figured the time it takes the ball to hit the...
  16. DaveC426913

    3 dimensions and 90 degree angles

    I am not sure how to form a coherent question about this; I can't figure out how to phrase it: Why are our three dimensions all at 90 degrees to each other? Drat, I can't even form the question. I've been reading about extra dimensions, such as the further 6 postulated in string theory...
  17. G

    Internal Reflection and Maximum Angles

    A corner reflector is to be made from a triangular prism with index of refraction n=2.56, as shown in the diagram on your assignment. What is the maximum angle (in °), with respect to the normal to the front surface of the prism, (theta), such that total reflection will occur? Ok this must be...
  18. M

    How Do You Calculate Total Work Done in This Physics Problem?

    There is a work question which I am having difficulty getting. A 35-kg trunks is dragged 10 m up a ramp inclined at an angle of 12 degrees to the horizontal by a force of 90 N applied at an angle of 20 degrees to the ramp. At the top of the ramp, the trunk is dragged horizontally another 15...
  19. K

    Proving a/sinα=b/sinβ from Triangle Sides and Angles

    I have to prove that a/\sin\alpha =b/\sin\beta. A triangle has sides "a", "b", "c" and angles \alpha and \beta (opposite of the sides "a" and "b" respectively). This is what I did: Draw a line "h" as the height of the triangle on the side "c". \sin\alpha = h/b. Multiplying by "b" gives...
  20. P

    Frame of reference, Forces, and Angles

    This is more of a concept problem that I'm trying to grasp. Verbatim from the book: "A box is moving with a horizontal velocity, v, relative to an inertial frame of reference so that a medallion of mass, m, inside of the box hangs from the roof of the box with an angle, theta, relative to...
  21. B

    Help finding Centripital force angles

    :confused: I'm stumped on my hw...can anyone help? The question is long, but as follows: a merry-go-round has circular platform that is 1m from the central axis at its inner edge and is 5m from the central axis at its outer edge. The ride takes 10s for 1 rotation. A passenger holds...
  22. F

    Calculating Force and Acceleration Vectors

    I'm having trouble with this question because of the angles. Could someone point me in the right direction. Two forces F1 and F2 act on a body of mass 28kg. F1 has a magnitude of 8N and is directed due east. The second force F2 has a magnitude of 10N and acts in a direction 50 degrees west...
  23. K

    Find the Measure of Angles A & C in Triangle ABC

    Using the formula relating the tangent of angle p enclosed between two given straight line L1 and L2 and respective slope m1 and m2,Find the measure in degrees of angles A and C of the triangle with vertices A(-3,4),B(5,6) and C(2,1) My work is Tan A = Ma = yb-ya/xb-xa=6-4/5+3=2/8=1/4...
  24. D

    Converting line slopes to angles

    Hi! I'm examining the equality between line slopes and angles. I've, using trig, conclude that this equation holds: sin(v) = \frac{m}{ \sqrt{1+m^2}} Anyone knowing a simpler equation is very welcome to post.
  25. Reshma

    Interior angles of a triangle on a spherical surface

    Explain me why the sum of the interior angles of a triangle is not equal to 180 degrees on a spherical surface?
  26. K

    Solving Forces and Angles to Load Fuel Drum

    hi, i need help on a question its like... there is a operator supported a plank horizontally by its two ends, but when loaded bricks on its centre and found that the weight of 166kg of bricks was just enough to break the plank. But an identical plank is now being used as a ramp to load a full...
  27. D

    What equations can I use to find missing values in a 3D vector problem?

    Im stuck on a 3d vector problem. I know Fx and Fz and angle Beta. I've looked at all the equations in the book (both my statics and physics book) and just cannot seem to put the given data together in a manner to give me another value. If I can just get either Fy or one of the other angles, I...
  28. P

    Angles in a Circle: Are They Equal?

    THis is a rather simple question and please feel free to delete it after it has been answered. I know that in a circle, Angles Subtended by the same Segment are equal. Question: Are angles subtended by equal, yet different (different positions on the circle), euqal? Thanks
  29. U

    Principle Angles: Am I on the Right Track?

    I do not quite get what principle angle angles are. Are they the smallest positive coterminal angle of an angle? Would the principle angles of: 1000 degrees be 280 degrees -500 degrees be 220 degrees ? Am I on the right track?
  30. N

    Snell's Law/Critical Angles Problem

    I know how to do critical angle problems, using snell's law, but i was given a circle and I'm not sure how i should go about finding the incident angle.. If someone could help me out with that it would be awesome! THX Nicole
  31. J

    Supplementary Angles for Spherical Trigonometry

    I'm trying to review spherical trinometry on my own and I'm stuck where it says the supplement of the solved dihedral angle can be implemented. I'm using "PLANE AND SPHERICAL TRIGONOMETRY" by Paul Rider. Can anyone explain the concept behind that statement, because the examples that I have are...
  32. Y

    Question about detectors and solid angles

    There's a square detector of area A. When a point source is placed at the center of this detector, half of the emitted particles are detected. What fraction of the particles are detected when the point source is placed a distance x away? I figured that at x=0, 50% of the particles are...
  33. M

    Tension, vectors and angles, oh my

    hi, I'm having trouble with another question: 2. A block of weight W is attached to the ceiling by a cord which makes an angle θ = 30° to the vertical, and to the wall by a horizontal cord. If the tension in the cord attached to the ceiling is 20 N, the tension in the horizontal cord will...
  34. T

    What Is the Maximum Deflection Angle in a Partially Inelastic Collision?

    I had made an error on my previous post so i will take it back to the beginning. I can't get this one for some reason. First look at the diagram: http://bosco.iwarp.com/diagram.jpg OK here's the problem: Two identical balls (mass m) undergo a collision. Initially one ball is...
  35. R

    Finding Molecule angles with vectors

    I posted this in the chemistry section, but I was recommended up here. We have a molecule with three unbonded electon pairs, so they will repel each other as much as possible. That's easy, it's 360º/3 = 120º However, when we have four unbonded electron pairs the angle is 109.5º How? I...
  36. R

    Calculating Molecular Geometry Angles

    Howdy, I'm trying to calculate the angles between the repulsion of electrons. Well, it looks like a vector problem. Basically, can I just think of 360º between each of the individual the XY, XZ, and YZ planes. If I set everything up with generic variables to everything, will they drop out at...
  37. M

    Stargazing Telescopes and resolving angles problem

    Is it possible to determine the smallest angle that can be resolved with a telescope if the only information you're given is the telescope's aperture? If anyone can help me out I'd appreciate it.
  38. D

    How can I draw angles using just a ruler and compass?

    Does anyone know a site that shows how to draw angles using only a ruler and a compass? 60 degree, 35 degree, 45 degree angels ect. Any explanation on how to do this would be great. I have to show curves to signify that I used the compass and I believe the method involves a point of...
  39. P

    Electric Field Lines and right angles

    Why are electric field lines always crossing equipotential lines at right angles? Can somebody please explain this to me? Thanks :smile:
  40. R

    Calculating Solid Angles for Gauss' & Ampere's Laws

    Can anyone help me in understanding solid angles and how to work them out in the context of Gauss' Law and Amperes Law calculations
  41. T

    Droplet impact angles, errors in.

    Hi Arcsin width/length of a water droplet on any surface will give you the angle between the droplet trajectory before falling (assume straight line rather than parabola) and the surface upon which it fell. As this angle approaches 90degrees (water drop falling vertically on a horizontal...
  42. K

    Angles between the forces Problem

    Two forces-- 50N and 60N are applied to the same point on a cart. Determine the resultant force on that cart when the angle bewteen the two forces is: a) 60 degrees Ok, I'm getting weird answers. I draw a diagram of that. Then I use cosine law and plug everything in and I end up getting 56N...
  43. T

    Forces of friction with angles

    I know the formula for friction coefficients is force over weight, but i don't understand what to do when angles are involved. Please help me by showing me where to put the angle measurements in this problem. A 1000-N crate is being pushed across a level floor at a constant speed by a force...
  44. M

    Cos(45 - v) = sin (v + 45) for all angles v?

    How can I prove that cos(45 - v) = sin (v + 45) for all angles v? :rolleyes:
  45. M

    When i have tan2x = 1 i get two angles

    When i have tan2x = 1 i get two angles: 22,5 and 205,5. But I also get 112,5 and 292,5 why? Why don`t I get just two? :rolleyes:
  46. P

    Solving Quadrilaterals with Known Angles & 1 Side

    to solve a quadrilateral when you know all four angles and one side? I can't seem to find any way to solve the other 3 sides in this one question I am working on. thanks :biggrin:
  47. A

    Finding Angles with Dot Product: A Beginner's Guide

    I'm very new to this. I know that to find the angle between two vectors we use the dot product, but what about finding the angle between a vector and each of it's axes? for example: A = 3i+2j+k, How can I employ the dot product when there is no other vector? Thanks and keep posting! Amil
  48. U

    Solving Terminating Angles & Quandrants - f(pi)=-pi

    terminating angles?? If sin(x) = cos(x), in which quadrants can angle x terminate? I have no clue what this question is asking. also... If {x+sin(x)}/cos(x) then f(pi) = ? {pi+sin(pi)}/cos(pi)= pi+0/-1 = -pi is that correct?
  49. M

    Refrence Angles & Positive/Negative Angles(Coterminals) HOW?

    my question is, how do you "Find one positive angle and one negative angle that are coterminal with each angle." : For example: \frac{5\pi}{12} And also, I had a question on this as well: Find the reference angle for each angle with the given measure. \frac{12\pi}{5} i noe...
  50. W

    Calculating Wavelengths & Refraction Angles for Violet Light

    Here is the question: Violet light has a frequency of 7.5 * 10^14 hz and travels from air to glass at an angle of 30 degrees. The index of refraction for violet light is 1.54. A) Find the angle of refraction B) Find the wavelength in air C) Find the wavelength in glass D) What is the...
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