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Imagine that Bob, at a spaceport, observes Alice flying by to the right in her spaceship at a velocity of 0.9c. When Alice’s ship had been previously docked at the spaceport, Alice had measured its length as 100 meters. Alice has five clocks on her spaceship: one in front (at 0 meters), one at 25 meters, one at 50 meters, one at 75 meters, and one at the rear at 100 meters. All the clocks are synchronized in Alice’s frame of reference. When Alice flies by Bob, Bob uses his lattice of synchronized clocks to take simultaneous photos of Alice’s clocks (simultaneous in Bob’s frame of reference). Bob compares the times shown in the photos of Alice’s second clock (at 25 meters) and fourth clock (at 75 meters). Which clock is running ahead of the other?
ByAdmin6. Question 6 Imagine that Bob, at a spaceport, observes Alice flying by to the right in her spaceship at a velocity of 0.9c. When Alice’s ship had been previously…
In the “pole in the barn” example done in lecture, even though Alice’s pole is 10 meters long, and Bob’s barn is 8 meters long, Bob thinks that Alice’s pole will fit completely inside as she goes through the barn. Why does he think this?
ByAdmin4. Question 4 In the “pole in the barn” example done in lecture, even though Alice’s pole is 10 meters long, and Bob’s barn is 8 meters long, Bob thinks…
If Alice travels to the center of the galaxy at a speed very close to the speed of light, why wouldn’t she be able to see the stars passing by?
ByAdmin5. Question 5 If Alice travels to the center of the galaxy at a speed very close to the speed of light, why wouldn’t she be able to see the…
True or false: Einstein’s paper on “the electrodynamics of moving bodies” (special relativity) was immediately acclaimed as a huge breakthrough.
ByAdmin6. Question 6 True or false: Einstein’s paper on “the electrodynamics of moving bodies” (special relativity) was immediately acclaimed as a huge breakthrough. 1 point True False
Alice is observing the arrivals and departures at a spaceport. She observes one flight land at pad D7, and then notes another flight take off from pad G23 seventeen seconds later. Alice knows that the distance between pad D7 and pad G23 is 1240 meters in her frame of reference. Meanwhile, Bob flies by the spaceport at a high speed V and observes the same landing and takeoff, though he records a different time and distance between the two events, based on his frame of reference. If both Alice and Bob plug in their values for the elapsed time and distance between the landing and takeoff into the formulas below (where c is the speed of light, t is the elapsed time, and x is the distance), which one will give the same answer for both?
ByAdmin11. Question 11 Alice is observing the arrivals and departures at a spaceport. She observes one flight land at pad D7, and then notes another flight take off from pad…
The period of a traveling wave is:
ByAdmin4. Question 4 The period of a traveling wave is: 1 point A measure of how high the wave peaks are. The time it takes for one complete cycle…