Exam 27: Relativity

Astronaut Spud Nick is space-travelling from planet X to planet Y at a speed of 0.60 c.When he is precisely halfway between the planets,a distance of 1 light-hour from each,nuclear devices are detonated.The explosions are simultaneous in the frame of the planets.What is the difference in time of arrival of the flashes from the explosions as observed by Spud?

In a spaceship that is approaching Earth at 80% the speed of light,the captain shines a laser beam directly toward Earth.The captain measures the laser light's speed to be 3.00 × 10⁸ m/s and the receiving station on Earth will measure exactly the same speed for this light.

An astronomer on Earth sees a meteor hit the Moon at exactly the same time as he sees a solar flare erupt on the sun.The solar flare and the meteor impact are simultaneous events in this astronomer's reference frame.

In an "atom smasher," two particles collide head on at relativistic speeds.If the velocity of the first particle is 0.741 c to the left,and the velocity of the second particle is 0.543 c to the right (both of these speeds are measured in Earth's rest frame),how fast are the particles moving with respect to each other?

Situation 27.1 A proton (rest energy = 938 MeV)has a speed of 0.80 c. -In Situation 27.1,the ratio of the kinetic energy of the proton to its rest energy is closest to:

The total energy of a moving electron is 0.758 MeV.What is the speed of the electron in terms of c?

An astronaut is traveling in a rocket at 90% the speed of light.If she measures 1.0 s between her heart beats,observers in all other intertial reference frames will measure more than 1.0 s between her heart beats.

The kinetic energy of an object moving at 10% the speed of light is