time

  1. H

    time and motion according to aristotle and newton

    HI guys can you help me by answering these 3 questions in words I am having trouble understanding them. 1. What is the relationship between time and motion according to Aristotle? 2. If Flash travels at the speed of light, does the light moving in his direction appear to him to be at...
  2. K

    Is space time curvature and absolute concept?

    Seeing we hear gravity warps space and time and now it seems even a rotating disk seems to warp the circumference of the disk relative to the radius and wondering whether an observer rotating with the centre of the disk would see this cirumcumference contraction; So would these...
  3. A

    Time dilation

    I will begin with a standard opening. When two observers, A and B, move inertially in relation to each other, SR predicts they will each see each other’s clock has slowed down. Suppose the speed of A’s clock is x and the speed of B’s is y. A will know that x>y and B will know that x<y. If...
  4. J

    Vertical displacement

    Hi, Currently working on a problem and I'm very lost, no detail in the lesson text on how to do it. Any help is appreciated. A spring is launched at 2.3m/s at an angle of 78 degrees to the ground. What is the maximum height reached by the spring? First I find the vertical velocity...
  5. J

    Object thrown off a balcony

    Hi, I've been here a lot lately, and I appreciate everybody's help. My lesson text has various errors in this lesson, and a lot of it is very unclear. It is really affecting how well I am learning the material, and it's hard to tell when I am correct or incorrect. Anyways, I'll stop...
  6. J

    displacement problem

    Hi, I got a different answer than the lesson text I am working on, and was hoping someone could explain. V2 = 31.1m/s a = 2.7m/s^2 t = 3.2s d = V2(t) - 1/2(a)(t^2) = (31.1m/s)(3.2s) - 1/2(2.7m/s^2)(3.2s)^2 = (99.6) - (1.35)(10.24) = 99.6 - 13.824 = 85.776m I...
  7. avito009

    Example of length contraction and time dilation.

    Is my interpretation correct? When you travel at 0.999 speed of light then to you what 3 seconds has passed is actually 67.2 seconds to an observer on earth if you are in a spaceship that is traveling fast. Also 1 meter to you on the spaceship would be observed as 0.45 meters on earth. This...
  8. X

    Time delay of EM waves in a rotational frame

    Hello, I have a question (two very similar questions) about the time and phase delay between rotating objects. I want to describe two extreme cases here. The figures cited can be found in the attachments. I would appreciate any helps. Case1 Imagine two observers (people with telescopes...
  9. avito009

    Can time flow backwards in a black hole?

    We know that a black hole has escape velocity greater than the speed of light. And when something moves faster than speed of light then time flows backwards. As per my understanding time stops at the event horizon because escape velocity here is the speed of light. But what about inside of a...
  10. avito009

    Time and gravitational field.

    We all know that if there is a mountain, at the base of this mountain time will move slowly than at the peak of this mountain. So this gravity that causes time to move slowly is infinite in a black hole. So time stops at the black hole. Since a lot more gravity means slower time passes by...
  11. avito009

    How to convert time into space?

    I was reading the proof of E=MC2. In one article it was mentioned that time can be converted to space. So time after conversion would be 300000. so speed of light c= distance/time. Now space that is the distance is 300000 and after conversion time is also 300000. So 300000/300000 we get c=1. So...
  12. M

    Time dilation problem

    Hi all, I have attempted the attached problem; The issue I has is I've seen it done 2 ways; 1. Calculate the proper time for the period of the clock then convert that time to the time that passes in the observers reference frame... This gives 42 ns. I believe this method to be correct...
  13. F

    Time and Photon

    Time has a direction. We can't return back in time. Space doesn't have a direction, we can move in it in any direction we want. Time is moving, space is static. For us. Let's look at a photon, which moves along the X axis. It can't move backward this axis, just like we can't move backward in...
  14. D

    Finding time for velocity ( water hammer related)

    Hello, The problem is given: I first found v0(final) from: v0=sqrt(\frac {2*g*h}{lambda*\frac {l}{d}+1}) v0=sqrt(\frac {2*9.81*18}{0.03*\frac {400}{2}+1}) v0 is 7.1 m/s 90% of v0 is v= 6.39 m/s. Time to reach v=6.39 m/s: t=\frac {l*v0}{2*g*H}*log(\frac {v0+v}{v0-v}) t=\frac...
  15. J

    Needs help with my homework

    5 liters of water at 70˚c need to cooled to 50˚c. Specific heat capasity of water is 4200J/kgK Latent of heat of fusion of water is 3.34 x 10e5 J/kg and the water density is 2000kg/m3 Q1 Determine the heat lost by the water when ice is added as the water cools to 50˚c Ans = 420 KJ...
  16. T

    Time for steam to fill a certain volume

    Hi, I'm new to thermodynamics. I am trying to find how long it will take a cavity of 2' x 4' x 4' to reach 211 F with a steamer with an output of 35 g/m @ 211 C. At some point I need to take into account the heat loss through the walls but for now I think I need to just find the time...
  17. K

    Working out reaction time?

    Hello, was wondering if anyone could help me in knowing how to work out the following question? You are driving down the M2 at 70 miles per hour, when you see a fox crossing the motorway. If you travel 6.26m before hitting the brakes, what is your reaction time? Thank you kindly xx
  18. P

    English grammar track on time

    English grammar is physics as we take study and test as counting on logics(Academy). So we can talk each other by language that is physics. Talking means just like forever as logical frame and in the same way for one man's life. It is the track for one way, forever. Each word is fit to time...
  19. Y

    Question about Time

    I’m writing a philosophy paper and need a little help with some maths on Time. To use the example within the documentary “The Illusion of Time” (Example Link: https://www.youtube.com/watch?v=YRwZ55zjzxc - Example illustrated From: 24:15min – 26:50min in the vid). The presenter explains how...
  20. P

    Finding the time it takes a light source to hit an observer

    The question I am trying to solve is: In A frame, a light source at rest located at x = 0 emits a pulse P_1 at t_1 = 0, emits another pulse P_2 at t_2 = t. A’ frame moves with constant speed V along X axis with A frame. Observer in A’ at X’ = 0 receives P_1 at t_1’ = 0, X_1’ = 0 (i.e. P_1 was...