Relative Definition and 1000 Threads

Firstly, I am new to this forum and this is my first post, so if I've posted to the wrong place or somehow violated a forum rule, I apologize in advance. This is the most polite forum I have ever found, and I stand in awe of all of you ladies and gentlemen. Will one of you--or all of...

Hi, The more humid it is, the more irritable the climate will be. The sweat will not evaporate easily if the relative humidity is high. I have been to two cities in two different countries recently - Madison in USA and Kolkata in India. The humidity in Kolkata is about 65% and that in Madison...

Is the expansion of the universe relative to our clocks and rulers? If so, it seems correct to include relativistic effects. And yet I am told that this is wrong. Regards, Jack Martinelli

Homework Statement Two particles have velocities u, v in some reference frame. The Lorentz factor for their relative velocity w is given by \gamma(w)=\gamma(u) \gamma(v) (1-\textbf{u.v}) Prove this by using the following method: In the given frame, the worldline of the first particle is X...

I am just reading through this free online textbook and it seems to me that there is a mistake on page 24. http://www.anselm.edu/internet/physics/cbphysics/downloadsI/cbPhysicsIa18.pdf#page=23 He describes the muzzle velocity, which he defines as the relative velocity between two objects...

Hello! I ve come across with something called ' relative element of a vector' Could you provide me a definition and how is it used? Thank you

Homework Statement "The Michelson-Morley experiment was conducted using an interferometer with L1 = L2 = 40m, lambda = 632nm, and maximum fringe separation d = 0.0022 fringes. Find the upper bound on the relative speed of the Earth and the ether, and clearly state the significance of the...

What is the equation to find relative sound intensity from a source when given the angle?

I Watched A Video . In Which , It's Mentioned That The Relative Size Of.. Gamma Rays - Atomic Nucleus X-Rays - Atom Ultra-Violet Rays - DNA Visible Light - Bacteria ... Radio Waves - Mountain Ranges What's Mean By Relative Size ? I'm Confused Alot ! Thanks Alot In Advance For...

an electron is moving with a velocity of 0.85c in the same direction as that of photon.the relative velocity of the electron with respect to photon is... and why?

Homework Statement A particle P is moving in a straight line with velocity u=10 m/s along the ground. Its line of motion makes angle θ=60° with the X axis drawn on the ground. A flat mirror oriented perpendicular to the ground as well as the X axis is moving with constant velocity of v=20...

I am trying to measure the relative permeability of a few materials, but the numbers I'm getting don't quite make sense. Maybe someone here can figure out what might be going wrong. My setup is as follows. I'm making solenoids using 30 AWG magnet wire wrapped around ferrite, steel and wood...

Homework Statement Aircraft A is describing a circular flight path in an anti-clockwise direction at 125km/h Aircraft B is flying the same path but in the opposite direction at 225km/h. If the radius of the flight path is 5km, calculate the acceleration of A relative to B when Aircraft A is...

Hello. I'm sorry if this is a really trivial question, but I'm not that good with vector arithmetics, so I have to ask. Let's say I have two objects on a 2D plane, that face some direction. I have (x,y) coordinates of each object, and I have an angle each object is facing. The relative...

Homework Statement The rods are hengedly connected. O is fixed, C is free to move in the x-direction and AB is parallel to OC. OA turns around O with an angular velocity of ##\omega##. further given: $$\theta = 30^{\circ}$$ $$|OA|=|BC|=l_1=0.30m$$ $$|AB|=l_2=0.40m$$ $$\omega=15rad/s$$ $$v_c =...

Homework Statement W(oa) = -5k α(oa) = 3k B = 30 deg B(dot) = -2cos 30i + 2sin30j = Vrel b(double dot) = 4cos30i - 4sin30j) Homework Equations Va = Woa x Rao + Vrel The Attempt at a Solution This is such a simple problem and I don't know why I am messing it up. I am just...

Hi all, Please forgive my simplistic understanding on this, as I am a novice with an interest in Science, but I have the following question: I've been reading a book on Einstein, and here's the stuff I get: Speed is relative since there is nothing to "fix" a grid to which we know to be...

Disclaimer: This is not for any class. I have downloaded this book ( http://www.ck12.org/book/CK-12-Physics---Intermediate/ ) and am ( attempting to (: ) work through it on my own. I am going through the section on relative motion ( section 3.3 in the book ) and am confused by a portion. It...

Relative movement or Observer knowledge about motion Are these things important about special relativity If its important,why and how? Thank you

As it's known, one of the most fundamental aspects of relativity is that all motion is relative. But when we apply length contraction, in our reference frame the object that we move relative to changes, so the distance may become shorter. So my question is, when said that motion is relative...

So I have been trying to figure out some orientation data that I gather from a triaxial gyroscope, and figure out my orientation using only initial conditions and angular velocity from the gyroscope's current axes. The data is all relative to the current orientation, so if I rotate the device...

Hello, Does anyone know why we use the root mean square of the relative velocity in calculating the mean free path? As is done in this example: http://galileo.phys.virginia.edu/classes/152.mf1i.spring02/MolecularCollisions.htm Seems like it would make more sense to find the mean of the...

Homework Statement As shown in the figure, a man is running towards left with constant velocity of 7 m/s. Also, a flat vertical mirror is moved to the right with constant velocity of 9 m/s. Calculate the relative velocity between the man and his image. Express your answer in...

1) On a recent exam, one of the questions asked to find the minimum speed at which you would have to fire two protons head-on if you wanted them to get them within 10^-15m. To make things a bit easier, I treated one proton as being stationary and then found the energy needed to bring the other...

Problem: Consider two particles a and b moving in opposite directions around a circle with angular speed ## \omega ##. At ## t = 0 ## they are both at the point ## \vec{r}=\ell \hat{j} ##. Find the velocity of a relative to b if the radius of the circular path traced out by the...

Homework Statement You measure 50V with a voltmeter, which has 300V as the max. input voltage. What will be the relative error (h%) of the measurement? Homework Equations The Attempt at a Solution hi i divided 50v / 300 V and get = 1,66 and divided it by 100 to get relative error...

Forgive me if I sound stupid here but is there anything that we could call Dead Space? An essence or quantum material that is traveling at zero velocity to everything? Something that we could say we are all traveling at x velocity relative to. I know we can all say we are traveling at such and...

First, a really basic one: if Jack is jogging past me with a constant speed, and I observe that speed to be v in my frame, with what speed will Jack observe me to be moving, as measured from his own frame? If the answer is not v, which Lorentz transformation do I use to derive it? Second, a...

Is the energy gained by a particle moving at a high velocity a product of acceleration or can it arise in an object moving at constant velocity? I mean...OK, thought experiment. I haved a 100 GeV spherical mass moving through space relative to the Earth at 10 m/s. I now accelerate that mass...

Homework Statement Find the coordinates of α, β, and γ rel. to u, p, q (unit vectors) of x = 1/9( 2i + 62j - 11k )( (Note there orthogonal to each other) Question 2 : The position vectors of two points A, B has position vectors a = < 2, 1, 7> and b = <1, 4,-1> Find the parametric vector...

Homework Statement A person moving towards east with a speed 'v' observes the rain to be falling vertically downwards. When he doubles his speed, the rain appears to come at 30° angle with the vertical. Find the actual speed and direction of rain with vertical. Homework Equations...

1. a) A relativistic proton has a momentum of 10x10^-18 kg*m/s. The rest energy of a proton is 0.150nJ. The kinetic energy of the protoon b) In this situation the speed of the proton is? 2. E=MC^2 P= MV/sqroot(1-(v^2/c^2) K=[MC^2/ sqroot(1-v^2/c^2)]-[mc^2] 3. The algebra in this problem...

Homework Statement (see attachment) Homework Equations The Attempt at a Solution Consider the system at time t (see attachment, I am representing the blocks as point masses) The component of acceleration along the string is ##a_0\cos \theta##. This is the acceleration of the...

The problem: Find the relative numbers of hydrogen atoms in the chromosphere (T=5000 K) in the n=1, 2, 3, and 4 energy levels. Solution: The Boltzmann distribution of energies is n(ε)dε=\frac{2πN}{(πkT)^{3/2}}\sqrt{ε}e^{-ε/kT}dε So using this I calculated the ratio to be, 1 : 5.4 x 10^-11...

edit: woops I messed up the title. It should have been relative to the shore. Homework Statement A boat’s speed in still water is 1.95 . The boat is to travel directly across a river whose current has speed 1.10 . Determine the speed of the boat with respect to the shoreHomework Equations I'm...

I saw someone post a question or a comment about relative motion and acceleration. It got me thinking about the spaceship in deep space with rocket boosters. Well, when that guy or girl hits the booster, he or she accelerates, but the person is not necassarily moving relative to anything. Is...

Hello, I'm trying to figure out the following formula/question. If I have an object and I wanted to reduce the effective outside gravity to as minimal as possible how would I calculate the results. I would like to note I have just lately become sparked with the passion of higher math and...

I calulated the time(s), then i found the uncertainty as a percentage of my results. Later on i calculated 1/time and used the uncertainty % which i originally calulated. Could somebody tell me if it is relative or absoulte uncertainty and why?

Pre-theoretically, we notice that objects have some property responsible for their varying dispositions to resist being pushed around in space, or to resist changes in motion given applied forces ("inertia"). So we introduce the term "inertial mass" to apply to the most physically interesting...

What is the difference between the two and what are the applications of them in a magnetic material?

Homework Statement A balloon with person A in it has a force of gravity of 3000N acting on it. The balloon has an upward force of 3800N due to the hot air in it. Two people are keeping the balloon hovering just above their heads by holding onto ropes attached to each side of the balloon. If...

This is a prediction that is made every day. If I do a back test assemble a curve composed of each days' prediction, I get fair results. However, if I smooth this backtest curve, I get fantastic results. So what I need to do is take today's prediction and the prediction time history...

Gravitational effects from large bodies of mass are nonexistent. These golden retrievers are in deep, deep space. They are named Mr. Squabbles, Alfredo, and Billy. Mr. Squabbles is suspended in space (at rest)--he has not been acted upon by any force. (If that's possible.) Alfredo has a...

Is how we choose to describe relative velocity arbitrary? For example, say I am floating in space with only Ball A and Ball B for reference. Ball A is moving away from me at 10mph, and Ball B at 20mph. I could say that I am stationary, and Ball A and Ball B are traveling at 10 and 20mph...

Source: Engineering Mechanics Dynamics - Hibbeler ---------------------- My friends and I have discussed and have no idea how to solve. So we looked at the textbook. We were told to use this equation. In this equation, A/B means 'A respect to B' Also, the equation is derived based on an...

Hello, If a man how is able to row on still water at 2.5m/s. If the water is moving at 1.5m/s, in which direction should he row. The answer is he should row at 53.1 degrees upstream but the question for an observer on the boat and another observer on land, how will the motion appear? For an...

Homework Statement https://dl.dropbox.com/u/51681259/physics_diag.png Object C & P are moving at the same constant velocity to the right, in the configuration of the image. The friction between object C and the ground is 0. Suddenly the friction increases to μ=0.9 between the ground and...

relative velocity of light in special theory of realtivity?? hello everyone.. as per the theory of special relativity, Postulate2:Any ray of light moves in the 'stationary' system of co-ordinates with the determined velocity c, whether the ray be emitted by a stationary or by a moving body...

Homework Statement If the truck was not stationary but was moving horizontally towards the ball at 25 ms-1, what would be the speed of the ball, relative to the ground, after the collision (in ms-1)? Mass of ball = 0.2 kg Mass of truck = 20 tonnes Initial velocity of ball = 20 ms-1 (to the...

Homework Statement A river flows with a velocity of 3 m/s east. The river is 300 m wide. A boat is moving 10 m/s due north. If the river flow is not corrected for, how far will the boat have moved downstream by the time is reaches the far shore? Homework Equations Trigonometry and...