Magnitude Definition and 1000 Threads

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. R

    I What Does Absolute Magnitude in the B Filter of a Distant Galaxy Refer To?

    When referring to the absolute magnitude ,for example, in the B filter of a distant galaxy(considered point source) what are we talking about? Are we talking about the observed redshifted flux density(luminosity density) hypothetically seen from 10 pc away (1) ; or are we talking about the...
  2. E

    Expression for Magnitude of Electric Field by dipole integral

    Homework Statement Consider the electric dipole seen in the notes. (a) Using integration, derive an expression for the magnitude of the electric field produced by the dipole at any point along the x-axis. Electric Dipole: http://labman.phys.utk.edu/phys136/modules/m5/images/electr5.gif...
  3. F

    The magnitude of the electric field

    Homework Statement Calculate the magnitude of the electric field at the center of a square 42.5cm on a side if one corner is occupied by a −38.2μC charge and the other three are occupied by −27.0μC charges. Homework EquationsThe Attempt at a Solution E=k(q/r^2) the direction of the electric...
  4. J

    Magnitude and DIRECTION of electric field of a square.

    Homework Statement Calculate the magnitude of the electric field at the center of a square 42.5cm on a side if one corner is occupied by a −38.2μC charge and the other three are occupied by −26.9μC charges. (This part done) Choose the correct direction of the electric field at the center of...
  5. 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/s22) 15 m/s23) 30 m/s24) 36 m/s2 [the accepted answer]5) 45 m/s2 Homework Equations x(t) =...
  6. Alistair McCheyne

    Slider Crank Magnitude and Direction of Force on Member AB

    Homework Statement Homework Equations The Attempt at a Solution https://scontent-lhr3-1.xx.fbcdn.net/v/t34.0-12/13140955_10156888508510486_863100825_n.jpg?oh=3f13a038f3dc053c7a10858aa62f6fc0&oe=57318819...
  7. Alistair McCheyne

    Slider Crank Mechanism Magnitude and Direction

    https://scontent-lhr3-1.xx.fbcdn.net/v/t34.0-12/13181084_10156883800920486_1357045350_n.jpg?oh=a39d7777f01c4aa06301c4f3d740de1e&oe=57301DBC 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...
  8. R

    Magnitude and Direction of induced voltage

    Homework Statement Hey everyone I have a physics e&m question: [/B] http://blob:https%3A//www.physicsforums.com/aa779f37-be23-43d7-a888-d70263a3854b Homework EquationsThe Attempt at a Solution I took the derivative to find the magnitude of the induced voltage. (do I need to add a constant...
  9. G

    B Magnitude of gravitational time dilation

    Hello, I am wondering how is the magnitude of the time dilation in a gravity field related to the time dilation we know from special relativity. How does the dilation caused by just being in the field compare to the dilation you'd have from your velocity if you fell into the gravity field from...
  10. StevieTNZ

    Magnitude 7.8 earthquake - Ecuador

    http://www.stuff.co.nz/world/americas/79010630/73-quake-hits-near-ecuador
  11. K

    MHB Expressing Vectors in x-y Coordinates & Calculating Magnitude & Direction

    I'm sure this is a simple concept but i just can't wrap my brain around it, the question is: a) Express the following vectors in terms of x-y coordinates: i)Vector V with direction π/6 and magnitude 4√3. ii) Vector W with direction 5π/4 and magnitude 4√2. b) Express the vector v + w in terms...
  12. S

    Compute the magnitude of the current density

    Homework Statement Copper and aluminum are being considered for a high‐voltage transmission line that must carry a current of 51.4 A. The resistance per unit length is to be 0.176 Ω/km. Compute the magnitude of the current density for an aluminum cable. Homework Equations R\quad =\quad \frac {...
  13. S

    Find the magnitude of the current density

    Homework Statement A beam contains 3.95×108 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 1.64×105 m/s. What is the magnitude of the current density? Homework Equations J = nev n = electron density e = electron charge v = drift velocity The...
  14. StevieTNZ

    Preliminary magnitude of 7.2 - Vanuatu

    Limited information at this time: http://www.9news.com.au/world/2016/04/03/18/48/preliminary-magnitude-7-point-2-earthquake-strikes-off-vanuatu#RLUVoLYwGDV21je9.99#9News http://www.stuff.co.nz/world/78508265/72-quake-has-struck-off-vanuatu
  15. S

    Magnitude of the E-Field at the center of curvature

    Homework Statement A circular rod has a radius of curvature R = 8.11 cm, and a uniformly distributed positive charge Q = 6.25 pC and subtends an angle theta = 2.40 rad. What is the magnitude of the electric field that Q produces at the center of curvature? Homework Equations E = kQ/r^2 6.25 pC...
  16. G

    Magnitude of avg acc. of train moving in a circle?

    Homework Statement "Assume that a train is traveling at 65 cm/s, and the track has radius 20cm. What is the magnitude of the train's average acceleration as the train goes from the tree marked A to the next tree B, located exactly 1/4 of the way around the track from tree A? [Hint: This...
  17. K

    Magnetic Field Strength Calculation for Electron in Uniform Field

    Homework Statement The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x-axis and exits 0.63 μs later at point A. What is the magnitude of the magnetic field? Homework Equations...
  18. StanEvans

    I Magnitude of the Second Derivative

    So to find the x values of the stationary points on the curve: f(x)=x3+3x2 you make f '(x)=0 so: 3x2+6x=0 x=0 or x=-2 Then to find which of these points are maximum or minimum you do f ''(0) and f ''(-2) so: 6(0)+6=6 6(-2)+6=-6 so the maximum has an x value of -2 and the minimum has an x value...
  19. B

    Force magnitude and direction Problems

    Homework Statement When doing force problems, you're sometimes asked to solve for the magnitude and direction of a given force acting on an object given the mass of the object, its accelleration, and the other forces acting on it. However, the force that you need to solve for could be...
  20. I

    Stargazing Calculating a Telescope's Limiting Magnitude

    Hello Everyone I'm new to this community so I hope that I have posted this question to the correct forum. If not, please advise on the best forum for my question. Recently, I have been trying to find a reliable formula to calculate a specific telescope's limiting magnitude while factoring...
  21. T

    Finding Magnitude of Magnetic Field

    Homework Statement An electron accelerated from rest through a voltage of 420 V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 29 cm, what is the magnitude of the magnetic field? Homework Equations r=mv/lqlB K=VQ Conservation of Energy...
  22. C

    Relationship between field lines and magnitude of charge

    Hi, I am curious as to whether there is a relationship between field lines and magnitude of charge. For instance, is the sketch for the electric field of a +1.0 micro coulomb charge the same as the sketch for a +2.0 micro coulomb charge? Thanks. All help is very much appreciated!
  23. C

    Finding the magnitude and direction of the electric field

    Homework Statement 13. Find the magnitude and direction of the electric field at P due to the two charges shown. Homework EquationsThe Attempt at a Solution I have attached both the question, which involves a diagram, as well as my attempt at the answer below. My first question is regarding...
  24. K

    Magnitude of the electric field across cell membranes

    Homework Statement The electric potential difference across a neuron cell membrane is 0.070 V. The thickness of the membrane is 5.0 x 10-9 m. a) Find the magnitude of the electric field across the membrane. Describe any assumptions you are making. Homework Equations ε = V/r The Attempt at...
  25. 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...
  26. W

    Magnitude of electric field/Need answer checked

    Homework Statement A long coaxial cable consists of an inner cylindrical conductor with radius a and an outer coaxial cylinder with inner radius band outer radius c. The outer cylinder is mounted on insulating supports and has no net charge. The inner cylinder has a uniform positive charge per...
  27. P

    Magnitude of static friction force

    Homework Statement A 500 kg ox runs and speeds up by 3 m/s2, but is held back by a 120 kg plow that is attached to its back. Assuming the coefficient of static friction between the horse's hooves and the soil is 0.73, what is the magnitude of the static friction force the soil exerts on the...
  28. blee22

    Electric potential and magnitude

    Homework Statement You start at a distance r from a point charge. The electric potential is 4500V at that point, and the electric field is 2.3x105N/C. a) What is r? b) What is the electric potential and magnitude of the electric field at a distance of r/4?Homework Equations v= kq/r E=kq/r^2...
  29. StevieTNZ

    Magnitude 5.7 Earthquake - Christchurch, New Zealand

    http://www.stuff.co.nz/national/76868658/live-57-earthquake-hits-christchurch Not Christchurch again. :( http://www.geonet.org.nz/quakes/region/newzealand/2016p118944
  30. M

    Magnitude of charge on parallel plates

    Homework Statement A small plastic ball of mass 7.51 × 10-3 kg and charge +0.123http://edugen.wileyplus.com/edugen/courses/crs6407/art/qb/qu/c18/lower_mu.gifC is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with...
  31. P

    Determining the magnitude of the resultant couple

    Homework Statement Calculate the magnitude and coordinate angles of the resultant couple moment, caused by the forces. Homework Equations M= r x F The Attempt at a Solution M3= -0.2* 80k= -16k M2= 0.2* 120i= 24i M1= -0.2*100j= -20j M4= r x F= ? I just can't seem to be able to expres r into a...
  32. J

    Estimating Star Counts from Density Laws

    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...
  33. Y

    What is the magnitude of the net charge enclosed by surface?

    Homework Statement A closed surface with dimensions a = b = 0.302m and c=0.604m is located as in the figure. The electric field throughout the region is nonuniform and defined by E⃗ = (α+βx2)ˆı where x is in meters,α=4N/C, andβ=4N/(C·m2).? What is the magnitude of the net charge enclosed by the...
  34. B

    Find the magnitude and direction of vectorA - vector B?

    Homework Statement Vector A⃗ has a magnitude of 20m and makes an angle of 30∘ above the positive x axis. Vector B⃗ has a magnitude of15m and is oriented 60∘ to the left of the y axis. Find the magnitude of A⃗ −B⃗ . Find the direction of A⃗ −B⃗ . Homework Equations sin 150 = sin 30 = 0.5 cos...
  35. R

    Time dilation magnitude in orbit around a black hole

    Hello, I'm working on a hypothetical situation involving a planetary body orbiting a black hole (similar to the scenario in Interstellar, but for different reasons), trying to balance tidal forces with orbital distance and time dilation. First, I'm interested in the effect of gravitational...
  36. S

    Find the magnitude and direction of the acceleration of the

    Homework Statement m=25 kg, F1=88N[E55N],F2=54N[E], mu (coefficient of friction) = 0.350 Homework Equations FNet=F1+f2-Ff The Attempt at a Solution 88cos55 + 54=104.47, 88sin55+0=72.1. dheta=tan inverse (72.1/104.47)=34.6 degrees, what direction is Ff is my question and I would appreciate a...
  37. REVIANNA

    Rolling without slipping magnitude

    Homework Statement [/B] A thin light string is wrapped around a solid uniform disk of mass M and radius r, mounted as shown. The loose end of the string is attached to the axle of a solid uniform disc of mass m and the same radius r which can roll without slipping down an inclined plane that...
  38. A

    The magnitude of the force of friction

    solved
  39. bcrowell

    Order-of magnitude estimate fails for angular momentum in decay

    When a nucleus gamma decays, the gamma has its intrinsic spin of ##1\hbar##, but it can also carry away a significant amount of angular momentum in addition to that. Quadrupole radiation is very common, and in exceptional cases you can even get gammas with 5 or ##10\hbar##. Now suppose I do the...
  40. C

    Signal to noise ratio and uncertainty in magnitude

    1. The problem statement, all variables and given/known dat Show that if you have a signal f and noise σf for a stellar flux measurement, then the uncertainty on the observed magnitude is given by σm = 1.0875 x σf / f Homework Equations (you should use the fact that when ε<<1 then log(1±ε) ≈...
  41. Q

    Magnitude of magnetic field at distance from central axis

    Homework Statement A coaxial cable consists of an inner cylindrical conductor of radius R1 = 0.040 m on the axis of an outer hollow cylindrical conductor of inner radius R2 = 0.080 m and outer radius R3 = 0.090 m. The inner conductor carries current I1 = 4.4 A in one direction, and the outer...
  42. P

    Magnitude of the Magnetic Field at point P

    Homework Statement Two long wires (in cross section) that each carry a current ##i## directly out of the page. What is the magnitude of the field at point ##P##, which lies on the perpendicular bisector to the wires? Homework Equations ##B_{wire}=\frac{\mu_0 i}{2\pi r}## The Attempt at a...
  43. G

    What is the Magnitude of Acceleration in the n Direction?

    Homework Statement can someone tell me why the acceleration in n direction is 18ms^-2 ? i only understand that the centripetal acceleration = 18ms^-2Homework EquationsThe Attempt at a Solution
  44. P

    Minimum magnitude resolvable by a spectrograph

    I am stuck on a problem regarding the minimum magnitude of an astronomical object that can be handled by a given telescope+spectroscope combination. The telescope aperture (D_T) is 2 m wide, the exit beam (D1) is 3 cm wide. The slit width (s) is 10 micrometers. The wavelength of interest is 450...
  45. D

    How Do You Calculate the Magnitude of a Charge in a Magnetic Field?

    Homework Statement A charged body, moving with a velocity of 8.0 * 104m/s at an angle of 30.0° with respect to a magnetic field of strength 5.6 * 10-5 T, experiences a force of 2.0 * 10-4N. What is the magnitude of the charge? Homework EquationsThe Attempt at a Solution I have no idea where to...
  46. 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...
  47. Han_Cholo

    Solid disk frictional torque magnitude

    1. A solid disk of radius R and mass M is initially spinning clockwise with an angular velocity magnitude ω. It is placed against a flat, horizontal surface with a coefficient of kinetic friction of μ. Find the frictional torque magnitude on the disk, and how long it will take the disk to come...
  48. C

    What is the magnitude of the force exerted by friction?

    Homework Statement Question: [/B]A 600-kg car traveling at 30.0 m/s is going around a curve having a radius of 120 m that is banked at an angle of 25.0°. The coefficient of static friction between the car's tires and the road is 0.300. What is the magnitude of the force exerted by friction on...
  49. Scott Towers

    Finding the Magnitude of Force in each of two vines

    Homework Statement A gorilla is hanging from 2 vines, each with an angle of 30° from perpendicular. Find the Magnitude of the force of tension in each vine. Object mass is 3.10 x 10² kg I have made an attempt at this. I have attached my handwritten notes. Lots of feedback please. Thank you in...
  50. M

    Specify force magnitude and angle

    Homework Statement See picture. Homework EquationsThe Attempt at a Solution I tried drawing a parallelogram, but it didn't help, so I'm stuck. I'd need an idea in the right direction, if possible.
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