Special Relativity Question Sally and John are born at the same time. When both are 20, Sally takes a space journey. She arrives back on earth and John is 50 but she is only 40. Since both John and Sally observe the other's time to be dilated, how can this be?
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Sally and John are born at the same time. When both are 20, Sally takes a space journey. She arrives back on earth and John is 50 but she is only 40. Since both John and Sally observe the other's time to be dilated, how can this be?
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- 18 Part 2 of 2 + eBook Hint Print References A spaceship is moving away from Earth with a constant velocity of 0.840c with respect to Earth. The spaceship and an Earth station synchronize their clocks, setting both to zero, at an instant when the ship is near Earth. By prearrangement, when the clock on Earth reaches a reading of 1.00×104 S, the Earth station sends out a light signal to the spaceship. According to an Earth observer, what is the reading of the clock on Earth when the signal is received?* Sophie and Frieda are twins. They plan a trip to planet X which is 54 light years from Earth. They both leave Earth on their 30th birthday, but on different spacecraft. Sophie takes a spacecraft that travels at .99c, and Frieda takes a spacecraft that travels at .95c. As soon as Frieda arrives she is met at the terminal by Sophie (who was waiting there for her since she had arrived!). What are each of their biological ages (to the nearest 0.1 year) at this meeting? Earth and planet X are in the same (stationary) frame of reference here. A light year is 9.47x1015 m (but using meters will be awkward here)You and a friend pass each other in spaceships that are each traveling 0.41c relative to the other. You observe that your spaceship (which you have measured to be 225 m long) is the exact same length as your friend's spaceship. How long is your friend's spaceship in their frame? How long is your spaceship in your friend's frame? = ______ =________