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Bob is moving to the right (positive x direction) in his spaceship at a velocity v (such that the value of the Lorentz factor is 2), and Alice is observing him. Each has their own lattice of clocks and measuring systems, which can be represented in two spacetime diagrams on the same plot, one for Bob’s frame of reference and one for Alice’s. Assume that the axes on Alice’s plot are at right angles to each other (horizontal and vertical) and Bob’s are at different but appropriate angles. If Alice observes a set of three flash bulbs at positions xA = 9, 13, and 24, and they all flash at tA = 7.3, which flash would occur first in Bob’s frame of reference?
ByAdmin5. Question 5 Bob is moving to the right (positive x direction) in his spaceship at a velocity v (such that the value of the Lorentz factor is 2), and…
True or false: The Kauffman episode shows that the impact of a “crucial” experiment on supporting or refuting a theory is often less than assumed.
ByAdmin4. Question 4 True or false: The Kauffman episode shows that the impact of a “crucial” experiment on supporting or refuting a theory is often less than assumed. 1 point…
If the spaceship in the “faster than light?” example travels from San Francisco to St. Louis at a speed of 0.25c, 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 0.25c, 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 10 km/hour away from Bob, and shoots a basketball behind her and toward Bob, what would be the horizontal speed of the ball as Bob measures it, and which direction is it going? (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…
In the lecture on “Spaceships on a rope,” the reason that the rope breaks according to the perspective of the stationary observer (A) is:
ByAdmin5. Question 5 In the lecture on “Spaceships on a rope,” the reason that the rope breaks according to the perspective of the stationary observer (A) is: 1 point …
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…