The mean lifetime of a muon at rest is 2.2 us. If the observed mean lifetime of a muon as measured in the laboratory is 11.0 μs: a) Calculate the mass of the muon at this speed. The rest mass of a muon is 207me, where is the rest mass of an electron. me b) Calculate the muon's kinetic energy. c) Calculate the muon's momentum.

4. In a colliding beam apparatus, two beams of protons are aimed at each other. The first proton moves with a speed of 0.70c to the right; the second moves with a speed of 0.90c to the left. Both speeds are measured relative to the laboratory frame of reference. What is the speed of the second proton relative to that of the first? oofl

An astronaut on a rocket ship is headed straight for another galaxy and an observer is standing on Earth. If they both shine a flashlight simultaneously as the rocket ship is moving away at a large speed, which of the following is true? A. The person on the rocket measures a higher velocity for the light from the flashlight. B. The person on the Earth measures a higher velocity for the light from the flashlight. C. They both measure the same velocity of light. D. It cannot be determined without additional information.

Suppose that two identical particles with rest mass m and non-zero velocities and respectively in the Lab frame collide to form a single particle with rest mass M. Which one of the following statements is correct? Select one: O a. None of the other answers is correct. O b. Mis equal to the sum of the rest masses of the original particles. O c. Mis less than the sum of the original rest masses. O d. Mis greater than the sum of the original rest masses.