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Consider Bob on Space Station Omega in deep space. At time t = 0, both Alice and Kris fly by Bob heading to the right at the same velocity, with Alice in the lead. (Alice passes by Bob at t = 0, with Kris slightly behind her.) Which diagram represents the world lines of Alice and Kris in Bob’s frame of reference?
ByAdmin6. Question 6 Consider Bob on Space Station Omega in deep space. At time t = 0, both Alice and Kris fly by Bob heading to the right at the…
Consider the twin paradox example done in lecture: On Alice’s outbound trip to the star, Bob observes Alice’s clocks running slower than his clocks. What does Alice observe regarding Bob’s clocks?
ByAdmin3. Question 3 Consider the twin paradox example done in lecture: On Alice’s outbound trip to the star, Bob observes Alice’s clocks running slower than his clocks. What does Alice…
Bob is moving to the right (positive x direction) in his spaceship at a velocity v, and Alice is observing him. If we want to draw Bob’s world line on Alice’s spacetime diagram, how do we figure out where it goes?
ByAdmin4. Question 4 Bob is moving to the right (positive x direction) in his spaceship at a velocity v, and Alice is observing him. If we want to draw Bob’s…
Let the relative velocity between two frames of reference be given by V. If V could be equal to the speed of light, what would the value of the Lorentz factor be?
ByAdmin8. Question 8 Let the relative velocity between two frames of reference be given by V. If V could be equal to the speed of light, what would the value…
If the spaceship in the “faster than light?” example travels from San Francisco to St. Louis at a speed of 0.99c, how fast does the ship appear to be going to the observer in New York?
ByAdmin8. Question 8 If the spaceship in the “faster than light?” example travels from San Francisco to St. Louis at a speed of 0.99c, how fast does the ship appear…
Alice creates a machine that can shoot basketballs in a horizontal direction. Using a radar gun, Bob measures the speed of the basketball coming from the machine when it is stationary and finds that it is 30 km/hour. If Alice then puts the machine on top of a car, which she is driving at 50 km/hour toward Bob, and shoots a basketball in the direction of travel, what would be the horizontal speed of the ball as Bob measures it? (Neglect any effects of air resistance or other sources of friction.)
ByAdmin12. Question 12 Alice creates a machine that can shoot basketballs in a horizontal direction. Using a radar gun, Bob measures the speed of the basketball coming from the machine…