Thinking about it
Matt and Professor Kawakami buy a spaceship with the funds from their startup. Matt goes for a ride with his treasured watch at .5c while Professor Kawakami sits in his office for K-Drama hour, along with his favorite clock. From the professor's point of view, which clock ticks slower?
What is the moving clock?
How one converts velocity into special relativity units
What is dividing by c?
The formula for calculating length contraction
What is L = LR/γ ?
Multiply by this to convert the matrix:
[m; mvx; mvy; mvz]
into four-momentum:
[pt; px; py; pz]
What is γ ( or 1/√(1-β2))
What does Professor Kawakami have a Ph.D. in?
What is Physics?
The time measured in the reference frame which also does not observe movement, often notated as Δ𝜏
What is proper time?
(Bring up graph)
Which event happens first in each frame?
In ground frame: A occurs first
In moving frame: They are simultaneous
The Lorentz transformation for x in a moving frame
What is x' = γ(x - βt)?
A particle has a four-momentum of:
[10 kg; 3 kg; 4 kg; 0 kg]
What is its mass?
Professor Kawakami's office's location
What is the Physics Research Building, room 2030?
What is β?
Sonic sees a chili dog stand and runs to it at a speed very close to that of light. Tails, observing Sonic, measures Sonic to have been moving for 5 seconds across a distance of 4 seconds. Sonic claims he was moving for 3 seconds. Set up how to find how far Sonic travelled using spacetime interval.
What is 52 - 42 = 32 - (Δx)2?
Professor Kawakami is riding a train to Matt. The train is moving at a velocity of .75. According to the professor, the trip takes 60 seconds. How long did the trip take, according to Matt?
What is 90.7 seconds?
A particle has a four-momentum of:
[9 kg; 3 kg; 0 kg; 0 kg;]
What is its velocity?
What is .3?
What is the number in Professor Kawakami's email?
You're sitting on your couch watching TV when your cat zooms by at a high speed relative to that of light. You notice that your cat's length looks different to you, even though it doesn't seem to have noticed a change itself. How has your cat's length changed from your perspective?
The cat's length appears shorter
Matt is riding a train to Professor Kawakami. The train is moving at .6 relative to the ground. According to the professor, who is waiting at the station, Matt's trip took 90 seconds. How long does Matt say the trip took?
What is 72 seconds?
A train is moving at a velocity of .5. An observer on the train notes that two firecrackers 50 microseconds apart explode simultaneously. According to an observer on the ground, how much time passed between these explosions? (Round to the nearest whole number)
What is 26 microseconds?
A particle has a mass of 5 kg and a velocity of .7. What is the four-momentum of the particle according to an observer moving at .6?
What is [6.25; 4.375; 0; 0]
The place where Professor Kawakami got his Ph.D.
What is the University of California?
Spatial coordinates (x, y, z) with synchronized clocks that record events instantaneously
What is a reference frame?
A train in SPAAAAACE travels between stations that are about 4.6 hours apart at a constant velocity. The trip takes 8.4 hours, according to an impatient commuter waiting at a station. How long was the trip according to a passenger?
What is 7 hours?
N and V are robots that are capable of moving at speeds comparable to that of light. Both are racing a distance of 6000 km across the planet's surface in the +x direction. N has a constant speed of .6 and V has a constant speed of .8. How much does V win the race by?
What is ~.008 seconds?
A blob with a mass m travelling with an x-velocity of .8 (as measured by the ground frame) collides with another blob with a four-momentum of
[.25m; -.25m; 0; 0]
The blobs combine when they collide. What is the final mass in terms of m?
What is 1.59m?
The top three reviews on ratemyprofessor.com describe him as this phrase.
What is "totally legit"?