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In the “good guys vs. bad guys” example done in lecture, why was it concluded that the bad guys would actually not be able to build a ship that traveled faster than the speed of light?
ByAdmin10. Question 10 In the “good guys vs. bad guys” example done in lecture, why was it concluded that the bad guys would actually not be able to build a…
Consider Bob on Earth. At time t = 0, Alice flies by in her spaceship at constant velocity, heading to the right. Which diagram represents Bob’s world line in Alice’s frame of reference?
ByAdmin2. Question 2 Consider Bob on Earth. At time t = 0, Alice flies by in her spaceship at constant velocity, heading to the right. Which diagram represents Bob’s world…
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…
Consider two identical light clocks, designed as explained in lecture. Bob has one, and Alice takes the other on her spaceship and flies by Bob at speed V. Bob observes Alice’s clock. What is the relationship between a certain amount of elapsed time on Bob’s clock and the corresponding elapsed time on Alice’s clock, as observed by Bob (where γ represents the Lorentz factor)?
ByAdmin9. Question 9 Consider two identical light clocks, designed as explained in lecture. Bob has one, and Alice takes the other on her spaceship and flies by Bob at speed…
The energy equivalent of a mass m at rest is:
ByAdmin9. Question 9 The energy equivalent of a mass m at rest is: 1 point  E = mc E = mc2 E = mv2/2 E = mv2
On a spacetime diagram with time in years and x in light years, what is the slope of a world line of a faster-than-light object that is moving to the right (positive x direction)?
ByAdmin1. Question 1 On a spacetime diagram with time in years and x in light years, what is the slope of a world line of a faster-than-light object that is…