# Question: A spaceship containing an astronaut travels at a speed of

A spaceship containing an astronaut travels at a speed of 0.60c relative to a second inertial observer.

(a) Who measures proper time intervals in the ship and the proper length of the ship: (1) the astronaut in the ship, (2) the second observer, or (3) neither?

(b) How much time does a clock on board the spaceship appear to lose in a day, according to the second observer?

(c) If the second observer measures a length of 110 m for the ship, what is its “proper” length”?

(d) What is the total energy of the astronaut according to the astronaut if her mass is 70 kg?

(e) Repeat part (d) from the viewpoint of the second inertial observer.

(a) Who measures proper time intervals in the ship and the proper length of the ship: (1) the astronaut in the ship, (2) the second observer, or (3) neither?

(b) How much time does a clock on board the spaceship appear to lose in a day, according to the second observer?

(c) If the second observer measures a length of 110 m for the ship, what is its “proper” length”?

(d) What is the total energy of the astronaut according to the astronaut if her mass is 70 kg?

(e) Repeat part (d) from the viewpoint of the second inertial observer.

**View Solution:**## Answer to relevant Questions

An electron is accelerated to a speed of 1.50 x 108 m/.s At that speed, compare the relativistic results o the classical results for (a) The electron’s kinetic energy, (b) Its total energy, and (c) The magnitude of its ...At a typical nuclear power plant, refueling occurs about every 18 months. Assuming that a plant has operated continuously since the last refueling and produces 1.2 GW of electric power at an efficiency of , how much less ...A spacecraft moves past a student with a relative velocity of 0.90c. If the pilot of the spacecraft observes 10 min to elapse on his watch, how much time has elapsed according to the student’s watch? Light of the same frequency is incident on two materials with different work functions. Discuss how the stopping voltage of the photoelectrons is affected by the work function. When light of wavelength of 200 nm is incident on a surface, the maximum kinetic energy of the photo-electrons is measured to be 6.0 x 10-19. What is the work function of the surface?Post your question