An extra-terrestrial creature travels at a speed of 0.5c. According to the clock on the earth, the E.T.’s trip lasted 17 days. Determine the difference (in seconds) between the time recorded by the earth clock and the clock held by the E.T.

An event occurs in a reference system at x = 500 m and t = 0.90 μs. AnotherThe reference system is moving at a speed of 0.9c on the positive x axis according to this reference system. Originscoincides at time t = 0 and the clock in the second reference system at the moment the origins coincideis reset. In what coordinates and time did this event occur according to the second reference system?

Two friends, Sungyoung and Azhar are initially 10 years old. While Azhar remains on Earth, Sungyoung rides on a spaceship which travels away from Earth at a speed of 1c for 5years (as measured by Azhar), then immediately turns around and comes back at 1c. When Sungyoung returns, Azhar is 2*5 years older than when Sungyoung left. How old is Sungyoung upon his return?

A spaceship moves past Earth with a speed of 0.808c. As it is passing, a person on Earth measures the spaceship's length to be 78.7 m. HINT (a) Determine the spaceship's proper length (in m).  m (b) Determine the time (in s) required for the spaceship to pass a point on Earth as measured by a person on Earth.  s (c) Determine the time (in s) required for the spaceship to pass a point on Earth as measured by an astronaut onboard the spaceship.  s

A spacecraft has a speed of 0.4c relative to Earth. As measured on Earth, the elapsed time between two events that happen at the same location on Earth is 4 h. Determine what the elapsed time between those two events would be from the spacecraft's frame.

If someone travels at v = 0.99c, she can become younger than her children (assuming the kids stay home on Earth). In one or two sentences, explain how this is possible.

David is 30 years old, and his sister Alexis is 25 years old, when David leaves to travel to planet Rosebud. Planet Rosebud is 20 lightyears away, and at rest relative to the Earth, and David travels at 0.85c. When David begins his journey, he is 5 years older than Alexis. When David arrives at planet Rosebud, who is older (David or Alexis) and by how much?

A clock is moving at v =(4/5)c. c is the speed of light. The clock passes our clock when both clocks read t = 0. When the moving clock reads t = 30 s, what will the clocks in our frame read?

A clock is placed in a satellite orbits the Earth with a period of 117 minutes. a) By what time interval will this clock differ from an identical clock on Earth after 2 years? b) If the two clocks differ by 2 s, how much time will have passed on Earth? (Assume special relativity applies, and neglect general relativity.)

Two students, Nora and Allison, are both the same age when Allison hops aboard a flying saucer and blasts off to achieve a cruising speed of 0.750c for a 27.5 year round trip (according to Allison). Neglecting the brief time periods required for the acceleration of the ship during blastoff and turnarounds, find the difference in age between Nora and Allison when they are reunited. 27.5 difference in age: усars Incorrect Who is older? Allison Nora They are still the same age. need more information