Twin A makes a round trip at 0.6c to a star 12 light-years away, while twin B stays on the earth. Each twin sends the other a signal once a year by his own reckoning. How many signals does B send during the trip?
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- A spaceship travels at 0.758c relative to Earth. If the spaceship fires a small rocket in the forward direction, how fast (relative to the ship) must it be fired for it to travel at 0.878c relative to Earth?As measured by the crew, a spaceship takes 8.1 years to fly from Earth to a distant star. If the ship traveled at 0.95c, which of the following is the distance between Earth and the star as measured by observers on Earth? 22.3 light years O 24.6 light years O 29.2 light years O 20.9 light yearsA ship is heading off to Bernard's star at 0.700c. As it passes a space station (at rest with respect to the Earth) a few days out from Earth, the ship fires a "photon torpedo" in the forward direction and another in the reverse direction. the torpedoes have a speed relative to the ship of 0.700c. On a space-time diagram, determine the direction and speed of each torpedo as seen by the station. Check your answers using the relativistic addition of velocities formula.
- In 2030, the Australian Space Agency launches a spaceship to our nearest neighbour Alpha Centauri, approximately 4 lightyears away. According to a clock on Earth how long will the rocket take to get there if it travels at v=0.999c=299482km/s (where 'c' is the speed of light equal to 299782km/s)? About 2 years. O About 6 years. O About 4 years. Zero time.An astronaut travels to the next star at a speed of 0.95c and back. He notices that his trek has taken him 11 years. When he returns, how much time will have elapsed on Earth during his absence?How far from the earth would you be able to travel in a lifetime of 76 years if you were able to travel at a constant speed of 0.70c?
- A newly constructed spaceship has a length of 100.0 m (as measured in the rest frame). This spaceship departs the Earth, bound for a distant planet located a distance D = 50.0 light-years away from the Earth. It travels at a constant speed of v = 0.900c. Part A) As measured by Mission Control on Earth, how long does the journey take? Enter the numerical value in units of years. Part B) According to an astronaut on the spaceship, how long does the journey take? Enter the numerical value in units of years. Part C) As measured by Mission Control on Earth, what is the spaceship's apparent length? Enter the numerical value in SI unitsImagine an alien spaceship and a human-controlled ship moving directly toward each other. An observer on Earth measures the both of their speeds as 0.685c with respect to the Earth. What is the speed of the alien ship with respect to the human ship? That is, what is the speed of the alien ship as measured by the pilot of the human ship? Express your answer as a fraction of the speed of light, c. |VAH/c|=