Relative Definition and 1000 Threads

In an ideal environment, if a light source is moving directly away from you at the speed of light will the light act like an object that is acted upon by two opposing forces and stand still? Would we be able to see the light source? Thanks! Secman

We have to determine in which of the following options, the first ion is more stable than the second. 1. 2. 3. 4. 5. 6. Attempt at the question 1. Since in the first one, +ve charge is due to bonding, not deficiency of electrons. 2. First one can get lone pair from N. 3. N...

Consider a train moving at speed 's' and there is a charge particle at rest relative to the observer at train. The second observer on a ground see the charge particle and observer moving relative to him, and infer the existence of a magnetic field strong enough that its field is significant at...

Hello. I've been thinking about potential on charged capacitors, and got confused. A charge is AFAIK absolute - there is a balance of electrons and protons in matter, which can be biased one way or another. However, voltage is defined as difference of potential, not an absolute value. So...

Say I have a coil that is stationary and I have magnets that move past it in a fashion similar to the example in this video: . What is the optimum orientation of the magnet and coil to induce the most current? I know I will want to optimize the rate of change of magnetic flux through the coil as...

I know this is a stupid question but I can't figure out how to get an answer. I'm trying to figure out if the rules of relativity force a limit on the velocities of two objects in relation to each other. Just as a thought experiment, if a spaceship is traveling at 186,281 miles per second over a...

I understand why time is relative, (thanks to Einsteins thought experiments) but why are length, energy, and mass relative. I can see that if mass is relative so would energy be (and vice versa) but I cannot understand why either are. Same with length. Any help?

Homework Statement 25cm to the right of a 0.5 microcoulomb charge is a -1.2 microcoulomb charge. Where (relative to the 0.5 microcoulomb charge) would a free electron be if the net electric force on the electron is zero?Homework Equations Fe=kq1q1/r2 E=kq/r2The Attempt at a Solution I keep...

The Bekenstein-Hawking entropy is expected to be, and has been shown to be in some cases, derived from counting states. However, entropy is not defined for continuous probability densities, and so I have heard it said that relative entropy (of which the mutual information is a form) is more...

Hi, I'm getting confused in combining relative errors. I have a relative error in evaluating the energy of some particle which is due to a wrong location of the spectrogram centre. this errors affects the energy and the relative error due to the energy resolution of the system. Thus I have...

If space contracts relative to the motion of an observer, would two observers traveling at different speeds disagree on the Planck length? Or is the Planck length constant such that two observers would agree on the Planck length, but would disagree about how many Planck lengths long certain...

Homework Statement Travelling at 0.8c in your 100m long spaceship you pass a second, identical ship t rest. How long does the second ship appear to you, and how long does our ship appear to it? Homework Equations l = (1 - v2/c2)^1/lo The Attempt at a Solution l = (1 - v2/c2)^1/lo...

A body is rolling without slipping. Let P be topmost point at an instant and Q bottom-most point at that instant..Is it true that Q remains stationary with respect to P all the time? What i thought was the purely mathematical thing. P will have velocity 2v to right and Q will have 0 velocity...

Homework Statement Given a polynomial P(x) and a divisor D(x), divide P(x) by D(x) and return the answer in the form P(x)/D(x) = Q(x) + R(x)/D(x) In this case: P(x) = 4x^2 - 3x - 7 D(x) = 2x -1 Homework Equations The one given above The Attempt at a Solution I solved the...

Is speed of light relative to "eather" flow? If 2 rockets fly from Earth in opposite directions. Both end up flying at 60% the speed of light. Does that mean they flay faster then the speed of light, compared to each other? Or is it relative to spacetime or eather or whatever?

hello guys if the water surface is at same temp as air above, and humidity is 100%, do any wataer molecules leave their liquid state to become vapour ie evaporate? I couldn't remember what professor said exactly, so i checked up on internet and it says water can't evaporate at 100%...

Homework Statement The attached figure below shows object A (mass,m), which is placed on a table, and wagon B (mass,M), which is in contact with the table. The top of the table and the top of the wagon are at the same height. A is made to slide on the table so that it transfers to the top of B...

I have a fog in my brain as I am trying to wrap my head around a problem and I am not sure how to word it so I will do my best. If object A is moving near the speed of light but without acceleration then it could be said to be at rest. Measuring a beam of light that passes its position...

Sorry for what is probably a silly question... Lets say we go into deep space, we place a string of electrons along say the X axis...all stationary relative to each other. Say we place 100 electrons from -50 to +50 using whatever units you want Now, you start from -50 and travel to 0...

Hi, Consider P = \boldsymbol{\nabla} f +\boldsymbol{\nabla}\times \bold{A} where f and A are scalar and vector potentials, respectively, and P is strictly positive and well behaved, and only nonzero in a domain \mathcal{D}. I want to find how the magnitude of \int \boldsymbol{\nabla} f dV...

I was hoping someone might be able to help sort out where I am going wrong in my calculation of the ratio of relative difference. Value1= .0759 Value2= .0544 SqRt(.0759 / .0544) = 1.181195 The above calculation seems to work, but in a situation like below where the values are...

Homework Statement A thin plastic spherical shell of radius a is rubbed all over with wool and gains a charge of -Q. What is the potential relative to infinity at location B, a distance a/3 from the centre of the sphere?Homework Equations \text{$\Delta $V}=\int...

Hi Everyone, I want to know that is there anyway to relate the relative permittivity (εr) & relative permeability (μr) ?... I am having relative permittivity of an material & i want to find out its relative permeability ... Like if εr = 2.2, then μr = ?... Please reply ...

I have been getting rather confused with rest mass, m0. here's the problem. A particle intially has a speed of 0.58c. A) At what speed does it momentum increase by 1%. B) At 10%, and C) At 100%. I have set it up as p=γm0v... then γ=1/ sqrt[1=(0.58)^2 but don't know what to do any...

Suppose there are two planets A and B, each stationary relative to the other at distance x. Now an observer travels from planet A to B. He sees that the distance between them has shortened. If the clocks on the two planets are synchronised, then with the help of a Minkowski diagram, it could be...

Can anyone help with the following question - see attachment. Answer C is correct. I have been told that it can be solved thus: As our compound contains carbon and hydrogen we need to calculate these masses and deduct them from 128 to give us the mass of the chlorine and bromine...

Homework Statement A 55kg student stands on a 4.6 kg surfboard moving at 2.0 m/s [E]. The student then walks with a velocity of 1.9 m/s[E] relative to the surfboard. Determine the resultant velocity of the surfboard, relative to the water. Neglect Friction. Answer: 0.25 m/s[E] Homework...

I have a few questions about time dilation and how it accumulates. 1a. Say you have a situation where you have two clocks that move away from each other with symmetrical acceleration and relative motion. From what I understand, each clock would appear to have slowed down relative to the...

We have particle accelerators on Earth that can speed up particles to near the speed of light. Earth itself is hurtling through space, as is the solar system and galaxy that its a part of. If an observer were to float outside of our galaxy and observe those speeding particles in the...

When a women cycles N at 40kmh^-1, the wind appears to be blowing from a E direction, however when she cycles S at 50kmh^-1, the wind appears to be blowing from the SE. Find the true velocity of the wind. My attempt is attached - I have tried to solve through components and usingthe fact...

Hello Everybody! I have a question - If I'm standing inside a train and I jump up in the air I will land in the same place, I think. Likewise, if I'm holding a pen in my hand and I throw it up in the air it will land again in my hand. But if I stood on top of the train, on the roof, and I...

By the equivalence principle, the gravitational mass of light is its inertial mass, which it has because it has momentum. Light can impart some of its the momentum to massive objects, upon which it will lose energy, which is manifested by its frequency (the basic principle behind doppler...

https://www.facebook.com/groups/258790870808892/#!/photo.php?fbid=2797441950335&set=o.258790870808892&type=1&theater[/EMAIL] Can anyone explain how is here relative speed exceeding the cosmic speed limit?

Homework Statement A man with a mass of 100kg stands on a scale with a sack of potatoes weighing 20kg. He throws the sack straight up. At the instant before he releases the sack, what does the scale read, in kg?Homework Equations n/a The Attempt at a Solution I assumed that because the sack...

Hey everyone, First off I am not a physics major or a math guru. Physics has always been some thing that I have been interested in though. Physical science and the way things work has always interested me. I mention this, because I do not want to come off sounding like an idiot. I know most...

relative velocity and resultant velocity?also in a connected(with strings) pulley system,how can we calculate the acceleration and velocities of the pullies and the masses connected onto it?

Homework Statement Two spaceships, each measuring 300 m in its own rest frame, pass by each other traveling in opposite directions. Instruments on board spaceship A determine that the front of spaceship A requires 1 microsecond to traverse the full length of B. What is the relative velocity...

I think I understand much of SR and some GR, but I'm always stuck when this thought comes to mind.It looks like a stupid proposition and never appears in discussions, but want it cleared up. Consider two objects separated by some distance comparable to the speed of light. Thus each observer...

The terms "absolute" and "relative" In discussions about relativity I use the term "absolute" as a synonym for "frame invariant" and "relative" as a synonym for "frame variant". I went to look for an authoritative definition and could not find one, so I am a little concerned. Is my usage...

At the present moment, I am reading a section in my physics textbook concerning relative velocity. In an example the author provides, he states that two trains are traveling in opposite directions at a speed of 80 km/h; and relative two each other they are traveling at a speed of 160 km/h...

I am starting to learn Mobile Phone Application Development. Suddenly this idea clicked in. The app starts with the Phone in rest on your living room table. Now, the phone is picked up from the living room and transported to the dining room. Could the app be able to tell this? Here is how I...

Hello, I have been very obsessed with a board game called Hex lately. I am trying to calculate the number of completed states (all positions filled in) on a 3x3 board where a certain player wins, given that some positions are already filled. I have attached a diagram illustrating what I am...

I don't mind according to whose mechanics like einstein or Newton but what exactly is acceleration truely..If 2 bodies accelerating at same speed,then do the first body appear stationary for second and viceversa or is there any fictious force acting on them..?

Homework Statement Hi, I want to calculate the relative error between two complex numbers. Let's say z'=a' + i b' is an approximation of z = a + i b. Homework Equations How can I calculate the relative error between two complex numbers z' and z? The Attempt at a Solution...

1. I have a capacitor that has been fully charged with a 10v source, then that source is removed. If I increase the distance between the plates, does the electric field stay the same, and the voltage increase, or does the voltage stay the same, and the field decrease? Or is it something that...

a motorboat moving at 8km/h relative to the water travels from A to a point B 10km whose bearing from A is 150. it then travels to C,10km from B and due west of B. if there is a current of constant speed 4km/h from north to south,find the 2 courses to be set. having a bit of trouble with...

Homework Statement explain how relative velocity is related to the direction in which rockets are launched...

Homework Statement A ladybug with a velocity of 10 mm/s [W] crawls on a chair that is being pulled with a velocity of 40 mm/s [40 degrees N of W]. What is the velocity of the ladybug relative to the ground? Homework Equations The Attempt at a Solution finding the y-component...

How can I determine relative density of solids in powdered form? or in other word... How do you determine relative density of metal powder... Thank you..

Why is gravitational potential energy relative to the height you set? When I say relative, I don't mean anything having to do with relativity. Obviously as you go further from the earth, you have more potential energy but in the equation Ug=mgh if you set the height to 0 there is no potential...