Magnitude Definition and 47 Discussions

An order of magnitude is an approximation of the logarithm of a value relative to some contextually understood reference value, usually ten, interpreted as the base of the logarithm and the representative of values of magnitude one. Logarithmic distributions are common in nature and
considering the order of magnitude of values sampled from such a distribution can be more intuitive. When the reference value is ten, the order of magnitude can be understood as the number of digits in the base-10 representation of the value. Similarly, if the reference value is one of certain powers of two, the magnitude can be understood as the amount of computer memory needed to store the exact integer value.
Differences in order of magnitude can be measured on a base-10 logarithmic scale in “decades” (i.e., factors of ten). Examples of numbers of different magnitudes can be found at Orders of magnitude (numbers).

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  1. L

    Finding The magnitude of the velocity

    i have tried V=Vi - (g*t) with an answer equals to 4 as well as d=Vi(t) + 1/2 a t^2 with an answer equals to 19 my final asnwer was 1.43 and it was still wrong i used formula a=v/t v=14 t=10 i divided 14/10 to get 1.4
  2. P

    Finding the angle between vectors a and m, knowing the magnitude of m and n

    Summary: Finding angle between vectors a and m, knowing magnitude of m and n, also the angle between m and n with 60 degrees. Using geometry, it looks like the angle is 30 degrees but the answer is suppose to be 54.7 degrees. I'm not sure how to solve this.
  3. S

    I Main Sequence Rules

    When viewing an HR diagram, the main sequence curve is apparent, and the general shape of it is obvious. However, in this truncated version, it's unclear to me exactly which stars should be considered main sequence. I've added a shaded grey area as what I think I should count as main sequence...
  4. B

    B Magnitude and Size

    What's the difference between magnitude and size? I mean, how can I say that AB vector has a magnitude of 9 Newton, and its length is 4 cm.
  5. alexi_b

    Finding Vector Angle using cosine law

    Homework Statement Vectors A and B have equal magnitudes of 4.93. If the sum of A and B is the vector 6.79j, determine the angle between A and B Homework Equations c^2 = a^2 + b^2 -2abcos(theta) The Attempt at a Solution I just rearranged the formula above so that I could solve for the...
  6. StillLearningToronto

    Magnitudes and Comparison

    Homework Statement You have decided to use a CCD camera to check if a 16th magnitude quasar is variable. With your telescope/camera combination, you know that a star with a magnitude of 0 would deliver 1 × 109 photons/second to one pixel, so this allows you to work out the photons/second from...
  7. Muhammad Danish

    Vectors (Multiplication)

    Homework Statement Homework Equations Is my solution correct? If not then please point out the mistakes and help me solve this question in the right way. Thanks in advance. The Attempt at a Solution
  8. E

    A frictionless incline with a block sliding down it....

    A frictionless incline (the triangle below) is bolted to the floor so that it can not move. A block of mass m slides down the slope, which makes an angle with the horizontal. a)Draw a free-body diagram for the block, labeling all forces uniquely. b)Describe all the forces listed above in the...
  9. D

    Physics Vector Problem

    Homework Statement You enter an antique classic car road rally with your 1956 Studebaker Golden Hawk. The rally course consists of the following segments: travel north at 25.0 m/s for 30.0 min, then east at 32.0 m/sfor 40.0 min, and finally northeast at 30.0 m/s for 50.0 min. For the entire...
  10. S

    Electrostatics? Magnitude and direction of a magnetic field

    Homework Statement A force of 2.4N is exerted on a -1.8µC charge in a downward direction. What is the magnitude and direction of the magnetic field at this point? (The assignment sheet is called "Electrostatics Questions", hence the "Electrostatics?" in the title) Homework Equations Electric...
  11. S

    Finding the magnitude of velocity vector

    Homework Statement A cricketer throws a 147g ball by exerting a force of 7.5N for 0.84s. If the launch angle is 39 degrees from horizontal, calculate the range of the ball. Homework Equations The Attempt at a Solution I have the range equation and I just need to find the magnitude of the...
  12. Unteroffizier

    Find Absolute Magnitude, distance and "T" of binary star system

    This is the problem given at my basic astronomy course. If I turn it in within a month correctly, I get 10 extra points in the finals. Problem: We have binary star system consisting of Star A and Star B. Astronomers have observed it for 11 years, during which it has moved from point A to point...
  13. S

    Finding magnitude and direction of reaction force

    Homework Statement A uniform horizontal rod of mass 4 kg and length 500 mm, is hinged at the left hand side and supported at rest by a chain (S) attached 10 cm from the hinge. Calculate the magnitude and direction of the reaction force on the rod at the hinge. State the principle you have...
  14. F

    Magnitude of charge with common Transparent tape

    Homework Statement a) Common transparent tape becomes charged when pulled from a dispenser. If one piece is placed above another, the repulsive force can be great enough to support the top piece’s weight. Assuming equal point charges (only an approximation), calculate the magnitude of the...
  15. Rodriesk

    Magnitudes and Directions In Uniform Circular Motion

    Homework Statement A biker is 40.0m to the east of a flag in a park, heading south at 10m/s. 30.0 seconds later, the biker is 40.0m north of the flag and heading east at 10.0m/s. For the biker in this 30.0s interval, what are: a) the magnitude and direction of the displacement? b) the magnitude...
  16. B

    Statics: Dimensionless Unit Vector

    Homework Statement Homework Equations The Attempt at a Solution So I began by subtracting. (205-160)=55 i (495+128)=623 j Both of these vectors are in the positive direction. So if I divide the vector by its magnitude I should get an answer of 1 in the positive direction for both i and...
  17. Const@ntine

    "Vomit Comet" SpaceCraft (0)-V & H at Max Height

    Homework Statement Physics for Scientists and Engineers, 8th Edition, Ex. 47 M4 A spacecraft flies from 24.000 ft to 31.000 ft, in which it enters a parabolic trajectory with a velocity of 143 m/s at an angle of 45, above the horizontal. It exits with a velocity of 143 m/s at an angle of 45...
  18. T

    Finding the magnitude of force P

    Homework Statement Homework Equations F = ma The Attempt at a Solution My value for P does not make any sense. Why is this so?
  19. Vanessa Avila

    How to solve for the magnitude and angle in this situation?

    Homework Statement Each one of the force vectors are surrounded with dimensions. But you're not given any angles. How do you solve for the resultant vector like that? Homework Equations Fr = F1 + F2 + F3 The Attempt at a Solution I tried taking the arctan(200/210) on the 435 N...
  20. Hackerjack

    Vector problem missing magnitude of two vectors

    Homework Statement Force A has a magnitude of 200 lb and points 35deg N of W. Force B points 40deg E of N. Force C points 30deg W of S. The resultant of the three forces has a magnitude of 260 lb and points 85deg S of W. Find the magnitude of forces B and C. Homework Equations...
  21. M

    Finding the magnitude of a vector

    Homework Statement [/B] If possible, refer to attached image rather than what's written below (as the image is easier to understand). Triangle ABC is equilateral and AD = BE = CF. Let u, v and w be unit vectors in the directions of AB, BC and CA respectively. Let AB = mu and AD = nu. i) Find...
  22. RoboNerd

    Question on finding maximum magnitude of acceleration

    Homework Statement An object is moving in the xy-plane according to the equations x(t) = 3sin(3t) and y(t) = 4cos(3t). What is the maximum magnitude of the particle's acceleration? 1) 5 m/s2 2) 15 m/s2 3) 30 m/s2 4) 36 m/s2 [the accepted answer] 5) 45 m/s2 Homework Equations...
  23. Alistair McCheyne

    Slider Crank Mechanism Magnitude and Direction Hi I am currently studying design engineering and my lecturer has left just before an exam. I really don't know how to find the magnitude and direction of...
  24. JustDerek

    Magnitude of velocity and acceleration

    A car travels around a circular track with a radius of r=250m. When it is at point A then VA=5m/s which increases at a rate of a=(0.06t)m/s2. Determine the magnitude of its velocity and its acceleration when it is 1/3 around the track. My distance in this situation is obviously 524m. Can anyone...
  25. J

    Counting stars

    Homework Statement (This is a long problem but I think the question is not hard.) Determining the star density from star counts is tough, but estimating counts from a density law is simpler. In practice, this method of fit-ting observed number counts to an assumed density law is becoming a...
  26. S

    How do I calculate the magnitude of initial acceleration?

    Homework Statement A system consists of a bicycle and a cyclist traveling at a constant velocity along a horizontal road. The total resistive force acting on the system in 4.0N and its speed is 8.0 m/s. Calculate the useful power output of the cyclist. The cyclist stops pedalling and the...
  27. G

    K Corrections

    So I'm trying to k-correct some fluxes in 250μm (janskys) using the M82 template found here and the relevant equations found here (I also have the transmission filter function). The template is normalised to 5500 A and doesn't have a brightness so I fail to see how I can correct my observed...
  28. almarpa

    Magnitud VS. Component of a vector

    Hello all. Sometimes, when reading a physics book, I find it difficult to distinguish between the magnitud of a vector and the component of a vector. For example, take the weight force, with the positive z direction pointing upwards (that is, F= -mg k). Sometimes, people write F=mg referring to...
  29. S

    Evaluate Magnitude of Gravitation at the Surface of a Planet

    1. The trajectory of a rock thrown from a height with an initial speed of 20.9 m/s is shown in the figure below. Evaluate the magnitude of the gravitational field at the surface of the planet. The planet has no atmosphere...
  30. pawlist

    Magnitude of Charges

    Homework Statement I need to find the magbitude of charges Lenght of string - 50 cm mass of balls - 0.2 grams theeta - 37 degrees Homework Equations K-8.99x10^9 [/B] The Attempt at a Solution I found that half the distance between the balls is 15.9 cm but i don't know how to continue[/B]
  31. 0btuse

    Three vectors lie in an xy plane

    Homework Statement Three vectors A, B, C, each have a magnitude of 46 m and lie in an xy plane. Their directions relative to the positive direction of the x-axis are 28 ˚, 191 ˚, and 313 ˚. What are the magnitude and the angle of A-B+C with right-arrow in the range of (-180°, 180°)? Homework...
  32. T

    What is George's location

    Homework Statement John, Paul, and George are standing in a strawberry field. Paul is 16.0 m due west of John. George is 40.0 m from Paul, in a direction 39.0 ∘south of east from Paul's location. A. How far is George from John? (Already Done) B. What is the direction of George's location...
  33. P

    Using vectors as a function of time

    Homework Statement Vector P is a function of time t. In a specified coordinate system P is given by: P= (A+Bt)i + (A+Ct-Dt^2)j and P is in meters when t is seconds Given these values (shown without their units): A=15.0, B=7.00, C=20.0, D=4.00 (a) Calculate the time when P points in the...
  34. Raybulous

    Direction of the Electric Field

    Homework Statement Homework Equations F = E x q The Attempt at a Solution I was told the direction of the E field should be pointing upwards but I have no clue as to why. I found the Force = 0.0012 N but not the direction.
  35. B

    Dynamics (Particle Kinematics)

    Homework Statement L=18ft , theta-dot=8rpm or .83776 rad/s, omega = 1 rad/s, fi-0=70.5 and fi-1=24 Homework Equations - 3D motion[/B] The Attempt at a Solution I have come up with a ton of different answet inbetween 12-18 ft/s^2. Non have been correct[/B]
  36. M

    Finding vectors and magnitude

    Homework Statement Find a vector in the direction opposite to <-4,1,2>, that has a magnitude of 3. Homework Equations I think that I did the first part of the problem correctly: <-4,1,2> magnitude= sqrt[ (-4)^2+1^2+2^2 ] = sqrt(16+1+4) = sqrt(21)...
  37. isaac206

    Tension on Rope, greater then, less than, or equal to [Broken] if the image does not show here's the...
  38. 2

    Stefan-Boltzmann law, luminosity, brightness and magnitude?

    From what I understand, in the equation P=\sigma AT^4, P is the power output of the star which is the energy radiated per second in EM radiation of all frequencies, and I think luminosity is also defined as the energy radiated per second in EM radiation of all frequencies. Therefore luminosity...
  39. entropy1

    Why do ket vectors not have magnitudes?

    Why does the magnitude of a ket vector not matter? The motivation appears to be that a state vector only can decribe a particle, or no particle. But why shouldn't the magnitude of ket vectors not be used to represent the density of the particles, the average number of particles? I'm am fairly...
  40. H

    A=F/M Based problem - air track glider

    At time t=0 s a 0.362-kg air track glider is moving rightward at 5.1 m/s. At t=2.5 s, it's going leftward at 5.4 m/s. Determine the magnitude and direction of the constant force that acted on the glider during this interval. Give your answer in Newtons. If the force is going rightward, your...
  41. PattyCake

    Electric Force

    1. Given that q=+12uc distance=19cm Find Magnitude and direction exerted on point q2. What happens to the force if the distance is tripled? q____________ q2 ____________q3 q1=+12 q2=-2.0q q3=+3.0q distances between point are equidistant. The Attempt at a Solution F=k Q Q/ d^2 F=F+F...
  42. Z

    Difference between impulse and magnitude of force

    we learned about the impulse of a force , but just then a question came to my mind , what's the difference between the magnitude of a force and its impulse , or are they the same ... ??
  43. A

    Magnitude & Direction of Electric field

    What are the magnitude and direction of the electric field that will balance the weight of (a) an electron and (b) a proton? Please I am getting confused in this question. I want help with complete explanation. Thanks in advance. How will it done..?
  44. M

    Magnitude, 2D co-ordinates and Coulomb's Law

    Homework Statement How do you calculate compute the the magnitude of the total force of three charges and also the angle it makes with the x-axis? Knowing the magnitude and also the 2d co ordinates of the charges. (x1,y1) (x2,y2) (x3,y3) I know for definite I use the below calculation but...
  45. M

    Coulomb's Law formula help

    How do you calculate compute the the magnitude of the total force of three charges and also the angle it makes with the x-axis? Knowing the magnitude and also the 2d co ordinates of the charges. I have deliberately not given any specific values because this is not homework its a question from...
  46. K

    Intro physics question involving magnitudes and vectors

    You’re hanging from a chinning bar, with your ;arms at right angles to each other. The magnitudes of the forces exerted by both your arms are the same, and together they exert just enough upward force to support your weight, 620 N. (a) Sketch the two force vectors for your arms, along with their...
  47. PhysicsHelp152

    Magnitude of a ball's Acceleration

    Homework Statement A 0.17-kg cue ball rests on the pool table. It's struck by a cue stick applying force F1→ = 13Ni^+21Nj^ Determine the magnitude of the ball's acceleration. Homework Equations ax = Fnet, x / m ay = Fnet, y / m a = Fnet / m The Attempt at a Solution Components of...