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relativity

physic for university

baharrani
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relativity

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  1. Relativity

  2. What is Relative? • A plane flies from Nairobi to Quito at 1,650 km/hr • Because The Earth rotates at the equator at 1,650 km/hr. • An observer : • “on the Earth’s surface sees the plane fly westward overheadat a far distance sees the plane stand still and the Earth rotate underneath it”

  3. Reference Frames Two or more objects which do not move relative to each other share the same reference frame. • they experience time and measure distance & mass in the same way (Objects moving relative to the other are in different reference frames) • like the plane and ground below • they experience time and measure distance & mass in different ways Since ground observers see light move at c, the plane passenger is always slower.

  4. Einstein’s Theory of Relativity • Speed ​​of a moving object can only be given relative to other objects. • The law of summarized does not apply to the speed of light. Speed ​​of light in all directions are the same, regardless of the motion of light source and the observer motion.

  5. The sum of the relative velocity. If the two speeds v1 and v2 are summed, the result obtained is : Details : v1 = speed of the object first to the groundv2 = speed of the object against the object Iv = speed of the object II to landc = The speed oh Light ( 3x 10^8 m/s )

  6. Time Dilation Now lets consider someone moving by at close to the speed of light • The outside observer can not see the light moving faster than c • yet the light does travel a longer distance as seen by the observer • so time must run more slowly for someone!

  7. length contraction A body length 1 moving with velocity v with respect to a stationary observer, then the length of the observed object observer is:l '= length of objects that were observed by a moving observerl = length of objects that were observed by a stationary observerv = velocity observer movesc = speed of light

  8. Time Dilation Formula moving Δt '= interval time events according toobserver movesΔt= time interval according to the incident silent observerv= velocity observer movesc = speed of light rest

  9. Equality of Mass and Energy If an object has a mass m, which turned entirely into energy,then the amount of energy are:E = energy (Joules)m = mass of object (kg)c = speed of light for the objects moving near the speed of light, its kinetic energy is : details :mc² = total energymoc²= rest energyEk= kinetic energy

  10. Einstein presented :

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