Question

D i think :/

Answer 1

alright I think I got it:

special relativity applies when objects are moving at a constant speed near the speed of light
general relativity applies when objects are accelerating

so that being said, any ideas what it might be? D doesn't work because segment E they're not moving at constant speed (note the difference between initial and final velocities)

Answer 2

A maybe?

Answer 3

for segment B the initial and final velocities are equal so this would be special relativity not general

try checking answer choice B

Answer 4

okay will do that

Answer 5

i wont know till the end of the 10 questions

Answer 6

for answer choice B, for segment C, is the probe changing its speed?

Answer 7

Oh i went to the next question

Answer 8

oh alright

Answer 9

sorry

Answer 10

A

Answer 11

answer choice A) would fall under kinematics which is under Newtonian physics

which one would you not be able to use newton's laws, like F = ma, or the kinematics equations, v = v_o + at, etc.?

Answer 12

D

Answer 13

oh ni

Answer 14

the momentum 1

Answer 15

well that's a good attempt but they're probably looking for momentum of an electron (which is described by the uncertainty principle)

so yeah B

Answer 16

B

Answer 17

kind of a trick question but the speed of light in a vacuum ~is~ always 3.0*10^8 m/s

so there are no frames of reference during which the speed of light in a vacuum is < 3e8

Answer 18

SO D =)

Answer 19

yes

Answer 20

D

Answer 21

light in space (which is essentially a vacuum) will always travel at the speed of light c = 3.0*10^8 regardless of the frame of reference

Answer 22

D

Answer 23

Im actually stuck between A and D on this, but leaning more towards D

Answer 24

alright we're getting into some wibbly wobbly timey wimey stuff but I'll see what I can find on the web

Answer 25

Haha " wibbly wobbly timey wimey" <--- Love that

Answer 26

yeah this the scientific basis for a lot of science fiction-y time travel stuff

anyway it seems like time slows down near the speed of light, still looking to see whether the clock would be narrower or wider

Answer 27

oh okay

Answer 28

narrower maybe? , or nothing yet? Im not rushing just wondering lol

Answer 29

yeah I've posted the question to the qc mod slack and we're having a bit of a debate about it

Answer 30

oh okay thats alright take your time lol

Answer 31

alright that was fun

anyway: from the perspective of the train, the clock on the stationary platform is also travelling at the speed of light, just in the opposite direction

at objects travelling the speed of light, they appear to approach a volume of 0

so the clock will appear narrower

therefore: the clock is narrower and runs more slowly

Answer 32

wow thank you...

Answer 33

this stuff is pretty complex ;_;

Answer 34

I know :/

Answer 35

The kind of concepts that make me want to major in physics, lol

Answer 36

wait

Answer 37

shadow that is right, right, narrower and slower? :S

Answer 38

or was it faster

Answer 39

Yes, because it is someone on the train approaching the speed of light observing something that is stationary. If you whiz by something on the road, it appears to be moving, just in the opposite direction.

And when something approaches the speed of light, it's space gets distorted. It appears narrower. Also, it moves slower.

Answer 40

alright cool just making sure

Answer 41

D?

Answer 42

good

Answer 43

well going off of that space probe problem

general relativity = accelerating frame of reference
special relativity = constant speed frame of reference

any ideas which answer might be the best description?

Answer 44

D

Answer 45

good

Answer 46

A or b ?

Answer 47

other way around, the frame has to be not accelerating

Answer 48

A

Answer 49

good

Answer 50

small objects

Answer 51

A+ good