2F What type of image would be produced by the setup above? a. virtual b. real and virtual c. no image Od. real F

QUESTION 12 You are in a car that is traveling at 40 mph. A car traveling at 50 mph passes you. How fast does that car, that passes you, appear to move? a. 50 mph b. 20 mph c. 10 mph d. 40 mph QUESTION 13 You are on a train platform and a train, traveling at 10 mph, passes by you moving to the right. A person on that train is moving at -5 mph as they walk to the left through the train. How fast does the person, walking on the train, appear to be moving to you? a. 5 mph to the left b.0 mph to the left c. 10 mph to the left d. 5 mph to the right QUESTION 14 Which acceleration below would you feel the most? a. 20 m/s^2 b. 10 m/s^2 c. 15 m/s^2 d. 5 m/s^2 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Sa MacBook Pro esc

The separation between events A and E is ctA Act' B C A E •F O a. space-like O b. frame-like O c. light-like O d. time-like ○ e. event-like X

Speed of light is just a theoretical concept: it cannot actually be measured in practice because light travels too fast. True or False?

The principle of relativity was recognised as both a mechanical and optical effect. Einstein believed that the principle should hold for both situations. One of his thought experimentds involves him sitting on a train travelling at the speed of light and looking at a mirror. He asked the question as to whether he would be able to see his own reflection. a) Outline one possible answer to Einstein's question and the problems involved in your answer in terms of the principle of relativity. b) What was Einstein's conclusion to this thought experiment?c) The theory of relativity discusses the physical consequences of a universal frame of reference. The special theory of relativity, published in 1905 by Albert Einstein, is concerned with problems involving inertial frame of reference. Its fundamental principles, however, caused discrepancies in measurements. Describe TWO apparent discrepancies caused by these fundamental principles.

In 2000, a 20-year-old astronaut left Earth to explore the galaxy; her spaceship travels at 2.5 X 10 m/s. She returns in 2040. About how old will she appear to be?

35. Three galaxies are aligned along an axis in the order A, B, C. An observer in galaxy B is in the middle and observes that galaxies A and C are moving in opposite directions away from him, both with speeds 0.60c. What is the speed of galaxies B and C as observed by someone in galaxy A?

6. You are a space traveller, moving at 0.60c with respect to Earth, on your way to a star that is stationary relative to Earth. You measure the length of your trajectory to be 8.0 light-years (y). Your friend makes the same journey at 0.80c with respect to Earth. What does your friend measure the length of the trajectory to be? 7. A spacecraft travels along a space station platform at 0.65c relative to the platform. An astronaut on the spacecraft determines the platform to be 3.00 X 102 m long. What is the length of the platform as measured by an observer on the platform?

2. Suppose the boat A is moving relative to the water with a velocity of 6 m/s due east and boat B is moving with a velocity of 12 m/s due west. Assume that observers on both boats use reference frames in which the x direction points east. According to the Galilean veloc- ity transformation equations, what is the velocity of boat A relative to boat B. (Hint: Draw a picture. Be sure to define which object corresponds to which frame.)

Two twins leave Earth at the same time in two different space ships. Jeremy travels twice as fast as Marnie. What will happen to them after they travel for one year of time back on Earth?