An astronaut flying at 0.65c takes a 3-h sleep period. How long does mission controlthink that the astronaut has slept?a. 4.61 h d. 3 h b. 3.90 h e. 2.28 h c. 3.58 h

1. Two cars are traveling at constant speed along a road in the same direction. Car A moves at 60 km/h and car B moves at 40 km/h, each measured relative to an observer on the ground. What is the speed of car A relative to car B? 2. A supersonic plane moves away from you, and in the +x direction, at a speed of 1000 m/s relative to you. A second plane, traveling in the same direction and ahead of the first plane, moves away from you, and away from the first plane, at a speed of 500 m/s relative to the first plane. How fast is the second plane moving relative to you? 3. Astronauts in a spaceship traveling at v = 0.6c relative to Earth sign off from space control, saying that they are going to nap for 1.00 h and then call back. How long does their nap last as measured on Earth? 4. A stick that has a proper length of 1 m moves in a direction parallel to its length with speed v relative to you. The length of the stick as measured by you is 0.914 m. What is the speed v? T 5. Muons are…

4. A rod at rest has a length of 100 m. How fast must the rod be moving to fit inside a 10 m barn? Leave the velocity in terms of c. 100 m 10m

3. Please answer these questions well explained. Scientists observe an electron travelling at 0.98 c. A. Calculates the total energy of the electron, in MeV, as measured by the scientists. B. Determines the kinetic energy of the electron, in MeV, as measured by the Scientists.