a). i). John and James are identical twins, James is placed in a spacecraft and sent to Mars at the speed of light. On his return, he is found not to have aged as John. Explain this observation iN). Hence, what is the change in time measured by an observer travelling at a). 1610km/hr and B). 0.8c (c=3.0.x10* m/s] if the rest time is lhour? b). i). Red light is focused on a metal and nothing seems to happen. When green light is used, electrons are observed to be liberated. Briefly explain this observation.

Similar questions

a) Galactus tries to destroy the Earth by stopping the Moon in its orbit. What effect would this have on the Moon and on the Earth? b) To prevent this, Flash (sorry, wrong company) runs to the Moon at a speed of 0.998c. From his point of view, the trip takes 0.126 s. How long does it take from our point of view on Earth?
1. An astronaut travels to a distant star with a speed of 0.46c relative to Earth. From the astronaut's point of view, the star is 4.40 ly from Earth. On the return trip, the astronaut travels with a speed of 0.90c relative to Earth. What is the distance covered on the return trip, as measured by the astronaut? Give your answer in ly f60 ss 0 ssf60* f60 ss 0 ssf6 ssf60 ssf6Q
8. Adam and Avani are twins. On their 19th birthday, Avani leaves on a spaceship and travels at 0.80 c. Avani returns to Earth on the day that Adam is celebrating his 35th birthday. How old does Avani believe she is?
1. If the velocity of your spaceship goes from 0.3c to 0.6c, then your mass will increase bya. 19%b. 38%c. 74%d. 100%e. 200%
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
a) Calculate the kinetic energy required to accelerate a single proton from a rest position to 0.9999c. The mass of a proton is 1.67x10*-27 kg. b) Find the ratio of the kinetic energy to the energy of a proton at rest. c) Explain why no particle accelerator will ever be able to accelerate any particle to the speed of light.
1 2. Preparations are under way for a spacecraft visit to the Alpha Centauri star system, 4.30- lightyears away Provisions are placed on board to allow for a trip of 8 years. a. What minimum speed must the spacecraft travel relative to Earth if the provisions are to last?
A spaceship travels at 0.698c 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 0.942c relative to Earth?? c
6) A rocket is moving at 0.7c. mz mssiles a) According to an observer on the rocket it launches a missile in the same direction it is moving with a speed of 0.4c. An observer on the ground measures the speed of the missile. What velocity does she measure? Please answer in terms of c. b) If the same rocket launched the same missile in a direction opposite to the motion of the rocket, what would the velocity seen from the observer on the ground be? What is its direction as seen from the ground? Hint: The addition of velocities requires a special formula which was in the lectures. To figure out how to use it start with the non-relativisitc version: V 12 = V13 + V32 then modify it with the correct denominator to make it relativistic: V12 = (V13+ V32)/(1+(V13 V32/c²)). Pay careful attention to the signs of the velocities. If you end up with a speed larger than the speed of light you have made a mistake.
1. A spaceship A moves east along the x axis with a speed of 0.80c and a spaceship B moves west toward the spaceship A with a speed of 0.70c as measured by an observer on the Earth. Calculate the speed of the spaceship A measured by an observer in the spaceship B in terms of c.
A rocketship moves away from Earth 0.60c. The rocketship fires a rocket toward Earth that moves at 0.20c with respect to the spaceship. The observer on Earth observes the rocket to travel at speed 0.____c. Round to 2 demimals.
1. You are an observer in a 100-m long spacecraft traveling from the earth to the moon at 0.8c. (a)What is the proper length of the spacecraft? (b) For a proper time interval of 1 sec., the relativistic time interval for the spacecraft measured from the earth reference frame would be: (c)Time dilation does not apply to all time-dependent physical and biological processes. T/F? (c) What is the relativistic length, DL measured from the reference frame of earth? (d) An APOLLO crew left a flat mirror reflector on the surface of the moon (for all you deniers out there, in the 50th anniversary year of APOLLO 11!). If the average surface-to-surface distance from the earth to the moon is 3.83 x 10^8 m, then how long does it take moonlight to reach earth?