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PHYSICS IN SPACE

PHYSICS IN SPACE. Anghel Theodor G h iban Vlad. Law of Gravity. “Every particle in the Universe atr acts every other particle with a force directly proportional with the product of the particles’ mass and inversely proportional with the square of the distance between them”.

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PHYSICS IN SPACE

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  1. PHYSICS IN SPACE Anghel Theodor GhibanVlad National College, Iasi, Romania

  2. Law of Gravity National College, Iasi, Romania

  3. “Every particle in the Universe atractsevery other particlewith a forcedirectly proportional with the productof the particles’ massandinversely proportionalwiththe square of the distance between them” This law was enounced by Isaac Newton, after the well-known experience with the apple. National College, Iasi, Romania

  4. m1m2 Fg=k r2 → F2 → F1 m2 r m1 k = 6,673 x 10-11 N·m2·kg-2 National College, Iasi, Romania

  5. Starting from this ecuation and customizing for Terra, we obtain the force The Earth attracts us with, our weight (“g force”). mp·m G=k r2 , where mpis The Earth’s mass, 5,975 x 1024 kg, and m is our mass. National College, Iasi, Romania

  6. This way we can define the gravitational field,a vector fieldwhichdescrebes the gravitational force thatactionson an object in every place in space, on mass unity. National College, Iasi, Romania

  7. m Γ=k Fg=Γ·m r2 For The Earth, this field is thegravitational acceleration (g, at The Earth’s surface!!!), equal to approximate 9,8 N/m2, so G = m·g National College, Iasi, Romania

  8. If we imagine a trip from The Earth’s centre to space, having the posibility to measure the gravitational field in every point we are…. …we will observe that it will vary like in this diagram: National College, Iasi, Romania

  9. National College, Iasi, Romania

  10. Kepler’s Laws National College, Iasi, Romania

  11. The german astronomer Johannes Kepler enounced a series of 3 laws that contradicted all the beliefs referred to the trajectory of a planet around a star. National College, Iasi, Romania

  12. First Law: “The orbit of every planet is an ellipse with the Sun at one of the two foci” National College, Iasi, Romania

  13. Second Law: “A line joining a planet and the Sun sweeps out equal areas during equal intervals of time” It results that the velocity of the platen increases as it’s closer to the Sun. National College, Iasi, Romania

  14. Third Law: “The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.” National College, Iasi, Romania

  15. Special Relativity Theory -Twin’s paradox- National College, Iasi, Romania

  16. The famous scientist Albert Einstein enounced, in 1905, the theory that proved to be the physics’ most important theory, the onethat links two dimensions that seemed to have nothing in common, THE SPACE and THE TIME. National College, Iasi, Romania

  17. “It’s impossible to accelerate a corpus to the speed of light” “the speed of light in vacuum, c=2,9979·108 m·s-1, is constant, not depending on the observatory’s state of motion” “The time and the space are perceiveddifferent, the measurementsof length and time are depending to the observatory’s state of motion” National College, Iasi, Romania

  18. Therefore, using Lorentz’s parameter, Einstein linked the state of motion and the time, starting the famous “Twin’s paradox” 1 ς= 1-v2/c2 National College, Iasi, Romania

  19. Considering two twins, X and Y. X goes into a space travel, with the velocity v=0.86 c, 86% of the speed of light, while his brother, Y, stays in repose on the Earth. Let X travel a distance of 4,45 light-years, so the time of the trip to be 10,28 years… National College, Iasi, Romania

  20. …so, Y will be older with 10,28 years. But, according to the relativity theory, X will be older with just 5,14 years. Δt’ = Δt ·ς = Δt · (1-v2/c2)1/2 = 10.28 · (1-0,73)1/2 = 10.28 · 1/2 = 5.14 years National College, Iasi, Romania

  21. Even if both brothers are moving with equal relative velocities, X will “age” less, his acceleration to get to the “slow down of time” National College, Iasi, Romania

  22. We can go on and verify every law of physics in space, but the result will be always the same: îin the whole UNIVERSE, the laws of physics are valid and they describe every phenomena. So, even if we consider Albert Einstein’s deliverance, under which “God is not playing dices”, or the one of Stephen Hawking, “God is a physics law”, the conclusion is that PHYSICS is everywhere. National College, Iasi, Romania

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