What is Uniform: Definition and 1000 Discussions

A uniform is a type of clothing worn by members of an organization while participating in that organization's activity. Modern uniforms are most often worn by armed forces and paramilitary organizations such as police, emergency services, security guards, in some workplaces and schools and by inmates in prisons. In some countries, some other officials also wear uniforms in their duties; such is the case of the Commissioned Corps of the United States Public Health Service or the French prefects. For some organizations, such as police, it may be illegal for non members to wear the uniform.

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  1. L

    Mass Conservation and Reynold Transport theorem for Non Uniform flow

    Homework Statement I will honestly be so grateful if someone can explain this to me. I am studying the Reynolds transport theorem, particularly mass conservation. I have read over my notes and I really do not understand how to calculate the mass flow rate through the control surface if it...
  2. G

    Three people are balanced on a uniform seesaw - Torque

    Three people are balanced on a uniform seesaw -- Torque Homework Statement Three people are balanced on a uniform seesaw which has a weight of 150 N as shown in the figure. Find the mass of person B and the normal force acting on the fulcrum. Homework Equations Tcw=Tccw The...
  3. J

    Uniform partition is the only one that matters

    Homework Statement We had to prove that an integral didn't exist by computing upper and lower sums. It was for f(x)=x for rational 0 for irrational Homework Equations The Attempt at a Solution Lower was easy, it's just 0 (inf of any interval is 0). But the upper...
  4. C

    A uniform steel bar swings from a pivot

    Homework Statement A uniform steel bar swings from a pivot at one end with a period of 1.3 sec. Solve for Length of bar Homework Equations T=2pi*sqrt(L/g)The Attempt at a Solution since the period is 1.3 seconds, I just plug in 1.3 for T and 9.8m/s^2 for g and solve for L i get L= .42m, which...
  5. B

    Uniform pdf from difference of two stochastic variables?

    Hi, I'm trying to find a probability distribution (D) with the following property: Given two independent stochastic variables X1 and X2 from the distribution D, I want the difference Y=X1-X2 to have a uniform distribution (one the interval [0,1], say). I don't seem to be able to solve it...
  6. C

    A uniform rectangular block of length 37.0 cm is placed so that its ce

    Homework Statement A uniform rectangular block of length 37.0 cm is placed so that its centre of mass is a distance of 1.50 cm away from the edge of the table. Since its centre of mass is still over the table (i.e. not sticking out past the edge), the block is stable. An identical block is...
  7. C

    . Suppose you are pushing a 60 N uniform crate at rest with a horizont

    Homework Statement . Suppose you are pushing a 60 N uniform crate at rest with a horizontal force of 40 N exerted at the top as shown. The crate is a cube with length of L. If the coefficient of static friction between the crate and floor is 0.75, which statement below is correct? (Hint...
  8. R

    Given charge of uniform density. What is the electrical potential @?

    Homework Statement Charge of uniform density 4.50nC/m is distributed along the circle of radius R. What is the electrical potential (relative to zero at infinity) at the centre of the circle? Answer: 254V Homework Equations electric potential: V=kQ/r The Attempt at a Solution Because the...
  9. J

    Moment of Inertia of a Rod with Two Uniform Masses Attached

    Homework Statement A uniform thin rod with mass 4.59 kilograms pivots about an axis through its center and perpendicular to its length. Two small bodies with a mass of 0.543 kilograms, are attached to the ends of the rod. What is the length of the rod such that the moment of inertia of the...
  10. C

    Finding Apparent Weight with Uniform Circular Motion

    Homework Statement A ferris wheel with a radius of 14.0 m rotates at a constant rate, completing three revolutions in 50.0 s. What is the apparent weight of a 60.0 kg passenger when she is at the top of the wheel? Given choices: 532 N, 452 N, 562 N, 625 N, 469 N Homework Equations...
  11. A

    About uniform continuity and derivative

    hello (pardon me if this is a lame question, but i got to still ask) If a function is uniformly continuous (on a given interval) then is it required for the derivative of the function to be continuous? I was thinking as per the definition of Uniform continuity, f(x) should be as close to...
  12. S

    Special relativity- Uniform circular motion.

    Homework Statement Imagine two clocks that both perform uniform circular motion of radius a in the x-y plane, but in opposite directions: xμ(u) ={t, a cos(ωt),±a sin(ωt), 0}. Suppose these clocks are synchronized to agree when they are coincident at x = a at t = 0. How much time elapses until...
  13. jegues

    Physical Electronics: Uniform Current Density

    Homework Statement Typical semiconductor fabrication technologies employ copper (ρ ~ 15.7nΩm; μr ~1) as the interconnect material. A process is designed for a clock frequency of 1GHz, has interconnect cross sections ranging between 35nm x 70nm and 0.18um and 90nm. Quantitatively determine...
  14. S

    Acceleration vs. uniform motion: There are three rockets in deep space

    The sun is far, far away. The Earth is far, far away. No stars. Nothing but unbounded spacetime. And three rockets. Rocket #1: Velocity (according to its odometer): 700 mph Towards Earth (constant speed) Rocket #2: Accelerating (according to its odometer) to 800mph towards some galaxy far away...
  15. STEMucator

    Deceptive uniform convergence question

    Homework Statement http://gyazo.com/55eaace8994d246974ef750ebeb36069 Homework Equations Theorem III : http://gyazo.com/af2dfeb33d3382430d39f275268c15b1 The Attempt at a Solution At first this question had me jumping to a wrong conclusion. Upon closer inspection I see the...
  16. S

    Acceleration and uniform motion are not making any sense

    It seems like there is no such thing as uniform motion. Example: I just took my pup to the beach. She crashed into many waves. We're back and she's asleep (at rest). However, her position in spacetime is changing because she's attached to the earth, which is moving, and the Earth is...
  17. S

    Struggling to understand why uniform motion is so different from non-u

    If all motion is relative, then why is the general theory of relativity so much more dense with mathematics? I'm not asking you to explain the math--there is no way I would ever grasp that. What I'm confused on is why non-uniform motion (accelerated or decelerated motion) is so different from...
  18. L

    Showing a random Variable has a continuous uniform distribution

    f(x)=1, θ-1/2 ≤ x ≤ θ+1/2 Given that Z=(b-a)(x-θ)+(1/2)(a+b) how would you show that Z has a continuous uniform distribution over the interval (a,b)? Any help would be much appreciated.
  19. STEMucator

    Proving Uniform Convergence of ##s_n(x)## to ##s(x)## on ##[b, ∞)##

    Homework Statement Suppose that ##s_n(x)## converges uniformly to ##s(x)## on ##[b, ∞)##. If ##lim_{x→∞} s_n(x) = a_n## for each n and ##lim_{n→∞} a_n = a## prove that : ##lim_{x→∞} s(x) = a## Homework Equations ##\space ε/N## The Attempt at a Solution I see a quick way to do this one...
  20. E

    Uniform circular motion particle problem

    Homework Statement At t1 = 3.00 s, the acceleration of a particle moving at constant speed in counterclockwise circular motion is a1=(6m/s2)i+(5m/s2)j At t2 = 4.00 s (less than one period later), the acceleration is a2=(5m/s2)i-(6m/s2)j The period is more than 1.00 s. What is the radius of...
  21. S

    Uniform circular motion lab question

    Could any here smart people help me with the Lab question: 3. Why do we measure the period by timing 25 revolutions? Why not one revolution or 100 revolutions? This is from http://www2.sunysuffolk.edu/denicog/labs/lab11_132.pdf Lab from Uniform Circular motion. Thank you so much!
  22. L

    Uniform continuity proof on bounded sets

    Homework Statement Prove that if f is uniformly continuous on a bounded set S, then f is a bounded function on S.Homework Equations Uniform continuity: For all e>0, there exist d>0 s.t for all x,y in S |x-y| implies |f(x)-f(y)| The Attempt at a Solution Every time my book has covered a...
  23. B

    Which wood cross section can carry highest uniform load

    Which wood cross sectioπ caπ carry hïghest uπiform load Homework Statement Homework Equations Moment of inertia for rectangle I=(1/12)bh3 τ=(VQ)/(I*b) σ=(MV)/I The Attempt at a Solution I started by finding reactions at B and C Then drew the sheer and moment diagrams (to save...
  24. D

    Electrons in uniform magnetic field.

    Hello. So I was wondering that when you shoot an electron through an uniform magnetic field, obviously Lorenz force starts to skew the path to that corkscrew shape that we all know. But then there is an acceleration towards the center of the circle, and if the the velocity of the electron...
  25. stripes

    Uniform convergence for heat kernel on unit circle

    Homework Statement I would like to use the Weierstrass M-test to show that this family of functions/kernels is uniformly convergent for a seminar I must give tomorrow. H_{t} (x) = \sum ^{-\infty}_{\infty} e^{-4 \pi ^{2} n^{2} t} e^{2 \pi i n x} . Homework Equations The Attempt at a...
  26. M

    Uniform Distribution Homework: Mean and Variance of Profit Y

    Homework Statement The proportion of time x that an industrial robot is in operation during a 40 hour work week is a random variable wth probability density function f(x)= 2x 0≤x≤1 I already found my E(x) to be 2/3 " Mean" and V(x) to be 1/18 " variance" Here is where things get...
  27. Z

    Rotation of a uniform rigid disc about a fixed smooth axis

    Homework Statement A uniform circular disc has mass M and diameter AB of length 4a. The disc rotates in a vertical plane about a fixed smooth axis perpendicular to the disc through the point D of AB where AD=a. The disc is released from rest with AB horizontal. (See attached diagram) (a)...
  28. M

    Potential difference in a uniform electric field

    Homework Statement An insulating rod having linear charge density l 5 40.0 mC/m and linear mass density m 5 0.100 kg/m is released from rest in a uniform electric field E 5 100 V/m directed perpendicular to the rod (Fig. P25.9). (a) Determine the speed of the rod after it has traveled...
  29. E

    A uniform spring whose unstretched length .

    A uniform spring whose unstretched length... A uniform spring whose unstretched length is L has a spring constant k. the spring is cut into two pieces of unstretched lengths L1 and L2, with L1 = nL2. What are the corresponding spring constants k1 and k2 in terms of n and k? The answer is k1...
  30. B

    Top view of a Gaussian surface in a uniform electric field

    The field makes an angle θ with side 1 and the area of each face is A. In symbolic form, find the electric flux through (a) face 1, (b) face 2, (c) face 3, (d) face 4 and (e) top and bottom. My professor got: a=EAcosθ b=-EAsinθ c=-EAcosθ d=EAsinθ e= 0 I understant why e=0 but for the...
  31. R

    Centripetal Force and Uniform Circular Acceleration

    I am in need for some help for a lab report. The issue has happened because there is a lab of 20 students that is being led by a recently retired NASA physicist trying to lead a team of graduate student (or camel jockeys as he puts it) and the lab instructions are being botched horribly...
  32. K

    Train Question? Uniform acceleration

    A subway trains starts from station A with a uniform acceleration of .5m/s and attains full speed after 50 seconds. It travels at full speed for 120 seconds then is brought to rest at station by by the application of brakes which provides a acceleration of -2.50. Find the distance between A...
  33. A

    Spherical capacitor in a uniform magnetic field

    Homework Statement Two concentric spherical shells carrying uniformly distributed charges +Q and -Q at radii a and b, respectively (b>a). Now, they are immersed in a uniform magnetic field pointing along the z-axis. Find the angular momentum of the fields.Homework Equations No need. (I know...
  34. T

    Divergence of velocity of incompressible fluid in uniform gravity

    Hi! The velocity field as a function of poisition of an incompressible fluid in a uniform acceleration field, such as a waterfall accelerated by gravity can be found as follows: The position is \vec{x}. The velocity field is \vec{v} = \frac{d\vec{x}}{dt}. The constant acceleration field...
  35. A

    Potentials of a charge moving with uniform velocity

    Homework Statement A point charge q, moving with uniform velocity \vec{v} = v \hat{z}, in the laboratory frame called \cal{K}. The charge is in the origin of the system at time t=0. Homework Equations Find scalar potential \Phi and vector potential \vec{A} both in the frame in which the...
  36. T

    Uniform circular motion with constant upward velocity.

    Homework Statement It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral motion as uniform circular motion combined with a constant upward velocity. Assume a bird completes a circle of radius 6.00m every 5.00s and rises...
  37. A

    Parallel plate - uniform electric field help

    Homework Statement A parallel-plate uniform electric field with a strength of 325 N/C is oriented as shown below. An electron (q = 1.6 × 10-19 C, m = 9.11 × 10-31 kg) is released (from rest) inside the field and moves 3.2 cm to the left. What is the final speed of the electron at the end of...
  38. E

    How is uniform electric field produced?

    How is uniform electric field produced? Consider two parallel plates with one +ve and the other -ve. The field depends on the charge producing the field and the distance to a point in between the place. However, in this case, the distance decreases and hence the field decreases and is not...
  39. F

    Electron in uniform field caused by two plates

    Homework Statement An electron is projected with an initial speed v_0 = 1.60 * 10^6 m/s into a uniform field between two parallel plates, separated by a distance of 1cm, and each plate is 2cm across. Assume the field outside the plates is zero. The electron enters the field at a point midway...
  40. A

    Radius as a function of Uniform Circular Motion

    How exactly does radius affect centripetal acceleration? In one formula we have (a=v^2/r) which implies inversely proportional, while in the other we have (a=(w^2)*r) which implies directly proportional. I understand that increasing r increases velocity (v=w*r) which means the right answer is...
  41. 2

    (Easy) Finding initial velocity from uniform acceleration

    Hi, I don't know what I'm doing wrong but these significant figures seem to be screwing me up. Problem: A bike rider accelerates constantly to a velocity of 7.5 m/s during 4.5 s. The bike's displacement is +19 m. What was the initial velocity of the bike? The textbook says the answer is 0.94...
  42. Z

    Kinetic Energy of a sphere due to uniform line of charge

    Homework Statement A very small sphere with positive charge 6.00uC is released from rest at a point 1.20cm from a very long line of uniform linear charge density 4.00uC/m.What is the kinetic energy of the sphere when it is 4.80cm from the line of charge if the only force on it is the force...
  43. N

    How Do You Calculate Deceleration from Average Velocity?

    Homework Statement A car decelerates uniformly and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's acceleration while slowing to a stop? {Since the acceleration is UNIFORM (constant), use vavg = (v0 + v)/2... } Homework Equations The...
  44. B

    Electric Field of a Uniformly Charged Rod

    Homework Statement A rod 16.0 cm long is uniformly charged and has a total charge of -21.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 42.0 cm from its center.Homework Equations The Attempt at a Solution The equation I am advised to use...
  45. E

    Uniform Circular Motion - Finding Fc/Ft without mass

    Homework Statement A boy ties a rock to a 0.95 m string and swings it in a horizontal circle directly over his head so that it completes one revolution every 0.75 s. What is the tension in the string? So we know r and we can calculate V, but that's all I can deduce Homework Equations...
  46. J

    Uniform Distribution over n and its limit

    Homework Statement Let Yn be uniform on {1, 2, . . . , n} (i.e. taking each value with probability 1/n). Draw the distribution function of Yn/n. Show that the sequence Yn/n converges in distribution as n → ∞. What is the limit? Homework Equations So Yn has c.d.f Yn(x) = |x|/n where |x| is...
  47. S

    F = MA 2011 # 14 (Creating a uniform sound)

    Homework Statement See: https://aapt.org/physicsteam/2012/upload/exam1-2011-1-3-answers_1.pdf Number 14 Homework Equations None that come to mind The Attempt at a Solution I think this is a conceptual question where each needs to be more proportionally spread apart because it...
  48. H

    Uniform Circular Motion Derivation of Radial Acceleration

    Homework Statement I am trying to derive the formula a_r=\frac{v^2}{r} for uniform circular motion (for personal understanding, this is not an assignment). But am having some difficulty. I have seen other proofs, but I want to know why my approach is wrong. The Attempt at a Solution...
  49. T

    Converting Uniform Load to Point Forces on Truss Pin Joints

    If there is a uniformly distributed load due to gravity on a truss, how do I convert this into point forces on the three pin joints on the truss? I am having trouble trying to work it out as I'm pretty sure there will be both forces in the x and in the y for each of the joints, but I can't...
  50. G

    A Uniform Beam Supported by a Cable

    Homework Statement A uniform 250 kg beam is supported by a cable connected to the ceiling, as shown in the figure. The lower end of the beam rests on a rough, horizontal floor. What is the magnitude of the tension in this cable? Image of the problem...
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