You and a friend pass each other in spaceships that are each traveling 0.61c relative to the other. Your friend takes a nap and you decide to time how long your friend's nap takes. In your frame, your friend's nap takes 1.9 h. How long was your friend's nap in their frame?  And unbeknownst to you, another person on your friend's ship saw you timing your friend's nap and decided to time how long you were timing your friend's nap. In that person's frame (which is the same as your friend's frame), how long were you timing your friend's nap? = _____   = ______

A spaceship leaves Earth traveling at 0.60 c. A second spaceship leaves the first at a speed of 0.90 c with respect to the first. Calculate the speed of the second ship with respect to Earth if it is fired in the same direction the first spaceship is already moving. Express your answer using two significant figures. ΑΣΦ 画 ? Submit Request Answer Part B Calculate the speed of the second ship with respect to Earth if it is fired directly backward toward Earth. Express your answer using two significant figures. ΑΣφ ? Submit Request Answer II

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 very fast-moving train car passes you, moving to the right at 0.50c. You measure its length to be 12 m. Your friend David flies past you to the right at a speed relative to you of 0.80c. How long does David measure the train car to be?

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?

Chapter 37, Problem 030 Stellar system Q, moves away from us at a speed of 0.975c. Stellar system Q2, which lies in the same direction in space but is closer to us, is moving away from us at a speed 0.492c. What multiple of c gives the speed of Q, as measured by an observer in the reference frame of Q;? Number Units

You and your secret celebrity crush pass each other in rockets that are each traveling 0.56c relative to the other. Your secret celebrity crush takes a nap and you decide to time how long the nap takes. In your frame, the nap takes 1.7 h. How long was the nap in your secret celebrity crush's frame? Unbeknownst to you, your secret celebrity crush's agent is onboard the celebrity's rocket and saw you timing the nap. Concerned, the agent decides to time how long you were timing the nap. In the agent's frame, how long were you timing your secret celebrity crush's nap?

You are standing still on a spacecraft that is traveling toward the Sun and 0.25c.  1- How fast are you moving relative to a person that is on Earth observing your spacecraft's motion? 2- You get out your radar gun and point it at the Sun. What speed do you measure for sunlight, given that your spacecraft is traveling toward the Sun at 0.25 c? 3- At what speed, relative to c, do relativistic effects become significant?

Rocket A passes Earth at a speed of 0.79c. At the same time, rocket B passes Earth moving 0.94c relative to Earth in the same direction. Part A How fast is B moving relative to A when it passes A? Express your answer using two significant figures. ΑΣφ ? v = Submit Request Answer