Time Definition and 1000 Threads

This video here <link deleted> 8.50 to 9.50 minutes , shows an apparent contradiction in time dilation, in the "twins paradox" the clock that is accelerated is relative, i.e. from Earth the spaceship moves but from the spaceship the Earth moves. I know time dilation is a real thing used in real...

Suppose there are two clocks. Clock B is moving with a speed of ##v## relative to clock A. Then clock A is moving with a speed of ##-v## relative to clock B. Let ##t_0## be the time interval for two events in the framework of clock A, while ##t## be the time interval for the same two events in...

An electron in my gold tooth travels somewhat over half the speed of light. I don't know the math, but let's say I age 10 years for every 1 year for the electron. Suppose we had a way where that electron could trigger a counter each time it "experienced" sunrise. (Let's don't get into how the...

Hello; What equations on mechanics can I use or study in order to measure the maximum force in Newtons the surface of the metal Steel box can hold. Details: Watch the image below, we have a metal box made of let's say steel, this box have a shape of rectangle of a thickness of for example 1cm...

In the Lagrangian (L1) point between two hypothetically massive (and close) objects , is gravitational time dilation effect summed or canceled, or something else?

please tell me if I'm correctly understanding what Newton was trying to say about time being absolute.did he mean that it doesn't matter whether or not you have a clock(which could be any repetetive phenomena) or how that clock is moving, time exists independently of all observation.(that's how...

Professor Ron Mallett is claiming that time travel is possible using lasers. I've put this in general for a reason (I was considering putting this in the sci fi section) Article here https://www.cnn.com/travel/article/time-travel-ron-mallett-scn/index.html What I would like to ask is regarding...

I tried taking log and then diffrentiate the standard equation for time period of a pendulum but i am not getting the correct answer

hi how can i draw velocity - time graph to determine whetere this particle has ever exceeeded the 30 km/h velocity or not ?

If you could instantaneously teleport from Earth to a planet in the Andromeda galaxy; when you arrive, would you be in what to Earth would be the distant past? Meaning that when you looked at Earth, you would be seeing what it looked like millions of years ago?

In physics, the concept of absolute time and absolute space are hypothetical concepts closely tied to the thought of Newton. Absolute, true and mathematical time of itself, and from its own nature flows equally without regard to anything external. There is another term duration measures...

By using the above formula I am getting value of time-period T as 6.757*10^6 hrs. But the answer given is 1.7 - 1.8 hrs.

Summary:: Which form of time travel would be considered more close to reality: The Flash or Avengers:Endgame? Which form of time travel would be considered more close to reality: The Flash or Avengers:Endgame?

Hi all, Forgive me if this post seems long, I tried to make it as short as possible by removing any unnecessary details, and leaving only the things needed. It would really mean so much to me if you would be able to read all of it to better understand my position, but if you're unable to read...

But the solution should be ##t_1 = \frac a {v_s - v_2}## I assumed the following - 1. I did not consider the frequency as the Doppler shift in frequency was not asked. 2. I did not add the distance the source moved in time ##t_1## to the total distance traveled by the wave as the pulse was...

Hello I'm FireAP and new here. Hoping to bring up some controversial topics during my time here.

ΔL= αLoΔT ΔL = (23*10^-6)(0.2480 m)(28.30°C) ΔL = 1.61 * 10^-4 Period is 1s, so each second the pendulum moves 1.61 * 10^-4 m 1.61 * 10^-4 m/s *(60s/1min)*(60min/1hr)*(24hr/1day) = 13.95 m/day T = s (1:1 ratio) 13.95 seconds. But the answer is actually 69.3 s. Is the equation T = 2π√L/g...

Hello! I'll be entering my second semester of my junior year of my Physics Degree. My uni doesn't have a bad physics program, but it's really small so I have to take my upper level classes as soon as they're offered or I won't take them for another 2 years or so. They are on a cycle so I will be...

Here is the Q below I want to see if my values for part b) is okay? This is what I have tried: Any help would be nice! Thanks

I had the wonder of whether, due to the speed difference, clocks ran at a different speed on the equator than on the poles. I then researched this, and found that, due to being closer to the centre of the Earth at the poles due to the bulging of the Earth due to spinning, the two essentially...

Special Relativity explains that there is no universal reference frame, all observations are relative. So a traveller departs on a return jouney on an aircraft and finds on return that his/her time has slowed down relative to a person who remained on the ground (this is tested fact). But...

I am reading this article now :http://www.cmp.caltech.edu/refael/league/thorne-morris.pdf. And i am a little bit confused about the Eq.(38a)and Eq.(38b), which means the time measured by traverller and people in the sataion, and I just think the time measured by traveller should be his proper...

I'm sorry but I can't even attempt this question since I'm pretty much clueless, I got the notes but I don't understand them.

Because the friction is the same in both parts, the calculated acceleration from (b) should be the same for (c) I knew I could find Vf, and thought I could do it with an energy equation Ei=Ef mgh=1/2mv^2 gh=1/2v^2 (2)9.81(1.5)=1/2v^2(2) (square root)29.43=(square root)v^2 v= 5.424 Then...

How to find potential energy if force depends on both position of particle and time ? Suppose force is : f(r,t) = (k/r^2) * exp(-alpha*t), k, alpha = positive constants, r = position of the particle from force-centre t = time Is this force a conservative or non-conservative ?

Hello, my name is Marcos, I have a bachelor in advertising and public relations, and my hobby is maths and physics The equation of variable-mass motion is written as ##\mathbf{F}_{ext}+\mathbf{v}_{rel}\dfrac{dm}{dt}=m\dfrac{d\mathbf{v}}{dt}## There are different derivations for the equation...

Hi All, I am doing a linear regression in Excel 2007. It is not available within the usual settings so I must. Edit: activate , an add-in called (Duh) Edit' Analysis Toolpak' What seems strange is that I have to install it each time I use it so that it seems to be installed only when the...

I have a speed estimator that calculates a cyclist's Steady State Velocity v given the rider's power output p (watts), rider mass m (kg) and hill gradient g. For this particular model, headwind and tailwind beyond the drag force conditions are not relevant. In the model I use, there are three...

Hi all.I would like to know about "binning window". This paper I'm reading says like this. Why do "convolving the data with the ##b(t)## before the sampling" and "binning into time bins with a width ##δt##" have the same meaning? I know I'm addicted to post to PF 😅 But this forum is so...

Tried to find time in seconds in order to use the formula d=vt and find the distance in the x plane in which the target must be placed, to no avail.

Shouldn't we question why cosmic voids are expanding but not galaxies?

I tried to calculate the time the charged particle will take to reach the plane using the a and using d=1/2at² and found the t to be equal to root(4εmd/σq). I guess the time period of oscillation will be double of t (by symmetry), i.e. 2root(4εmd/σq). I don't know if this is correct.

A and B leave their places and start moving towards each other. If they are 50m apart after both 2 min and 3 mins, how far are their places? I can able to draw a diagram for this problem: Take distance between their places as D Speed of A = x meter /minutes Speed of B = y meter/minutes So...

Problem: You are playing soccer with some friends while some people nearby are playing hide and seek. When the seeker gets to '4', you kick the soccer ball high in the air. WHen the seeker says '5', the ball is 10 ft in the air. When the seeker gets to '7', the ball is 20 feet in the air. How...

What feature of the equations of classical physics show that space and time are fundamental and how would the equations differ if space and time were not fundamental but emergent? I heard all of this from a previous talk and I would appreciate any help and any further reading recommendations.

Good morning, I'm trying to workout the time for an element to diffuse at set distance in microns. I have the distance, the diffusion coefficient, just unsure which equation I actually use. X= sqrt DT or the other one x= sqrt 2DT. I can't seem to figure out when you use one and not the...

What is the relation of the arrow of time and entropy according to thermodynamics?

1. So for an asymptotically far-away observer, something falling towards a black hole will never reach it 2. However, the thing falling in will reach the event horizon is finite affine parameter 3. The Universe has a finite age for an asymptotically far away observer a) Does this mean that one...

The is a question about gravitational time dilation and escape velocity. As others have pointed out, you may use escape velocity to calculate gravitational time dilation in a gravitational field. (Interestingly, you can't use gravity to calculate gravitational time dilation, which makes...

I already found ##I(t)## using Kirchhoff's laws, I got the equation ##V-RI-L\frac{dI}{dt}=0\Rightarrow L\frac{dI}{dt}=V-RI## then I solved the differential equation getting ##I(t)=\frac{V}{R}\left[1-e^{-\frac{R}{L}t}\right]##. My problem is founding the voltage as a function of time ##V(t)##, I...

I am performing some calculations but struck with confusion whether I am doing it correct or wrong due to contradictions of these calculations on different calculators websites. I hope here someone will help me with the validation of my calculations. Battery Capacity = 150 Ah Battery...

I have a copper cylinder that is at 0C, how much time will be needed for it to equilibrate with 10kg of water at 75C? Copper cylinder: Mass: 105.7 g Specific heat: 0.385 J/gC Initial Temp: 0C Final Temp: 75C ish SA: 25 cm^2 Water: Mass: 10000g Specific heat: 4.184 J/gC Initial Temp: 75C...

My problem started when I took my alternator apart to grease bearings when I put it back to together dash light came on so took it apart seen wire to one of the brushes was broken soldier back together it work for a short while the light was back on seen soldier had broke again so I changed...

Summary: S5-HVS1 travel time If S5-HVS1 is going 10 times faster than the rest of the stars of the milky way, does that mean that time is going slower than us? How much slower is time going, 10 times?

Scenario: Three types of scifi hyperdrives are available to you. Class I: A small drive that can be fitted on small vessels. Hyperspace travel time is a lightyear covered per 30 minutes. Yet in reality, outside 30 days passes for every 30 min of hyperspace travel. So about 2 hours would get you...

with distance between planets as 4x10^8m measured by you on the ship My attempt: t' = γ(t - ux/c^2) γ = 5/3 u = 0.8c t = 0.9s x = 4x10^8m answer is: -0.278 Therefore not possible My question is what if we traveled rightwards, from p2 to p1, would the answer change? Should my above information...

I'm having a hard time understanding how exactly to evaluate the expression} $$\partial_t \mathcal{T}\exp\left(-i S(t)\right)\quad \text{where}\quad S(t)\equiv\int_{t_0}^tdu \,H(u) .$$ The confusing part for me is that if we can consider the following: $$\partial_t \mathcal{T}\exp\left(-i...

Given the example g = \frac{GM}{R^{2}}, we may compute the change in field strength if the mass is changed by a small amount dM to be$$dg = \frac{G dM}{R^{2}}$$and also if R is changed by dR,$$dg = \frac{-2 GM dR}{R^{3}}$$If, however, both the mass and radius are changed by a small amount at the...

Hi, Can anyone please help me with the following: I have found the velocity of projection, no problem, it is v = 2*sqrt(10) Also, in obtaining this value, I have also found the extension in the string when in equilibrium, it is x = 2 Now on to the time of flight. The given answer is: t =...