HSC Stuff > HSC Physics
HSC Physics Marathon[NEW SYLLABUS]
DrDusk:
Question 3 answer.
They wont always provide a diagram. Sometimes there really is a lot of info so you gotta learn to stay calm and work your way through it.
A question like this can definitely appear in a trial or hsc exam.
fun_jirachi:
--- Quote from: DrDusk on October 04, 2019, 04:56:28 pm ---Question 3 answer.
They wont always provide a diagram. Sometimes there really is a lot of info so you gotta learn to stay calm and work your way through it.
A question like this can definitely appear in a trial or hsc exam.
--- End quote ---
Yeah, that's what I did. I think a lot of the big words got me confused, and it took me a while to realise what the question was actually asking :) Thanks for the question though, definitely challenging! Hope there's more to come :)
THSCStudyOnly:
Well done for getting it!
I redid it a different way and still got it wrong because I used negative acceleration....
I used qE=ma and solved for acceleration in the first plate (after using V=Ed to find E) then I used it to find the v (using kinematic equations) coming into the second set of plates. After this I found the acceleration in the second set of plates (using same thing I did for the above ones). Then I used s=ut+1/2at^2 to plug those values in, but I used negative acceleration (because a=qE/m gave me a negative value which I forgot to times by negative again because the electron in moving down). My bad.
DrDusk:
--- Quote from: THSCStudyOnly on October 04, 2019, 05:09:52 pm ---Well done for getting it!
I redid it a different way and still got it wrong because I used negative acceleration....
I used qE=ma and solved for acceleration in the first plate (after using V=Ed to find E) then I used it to find the v (using kinematic equations) coming into the second set of plates. After this I found the acceleration in the second set of plates (using same thing I did for the above ones). Then I used s=ut+1/2at^2 to plug those values in, but I used negative acceleration (because a=qE/m gave me a negative value which I forgot to times by negative again because the electron in moving down). My bad.
--- End quote ---
That's really great as well. You would still get 2/3 for it so good job!
I hope this teaches you to always picture the scenario in your head when dealing with situations like this. I would recommend drawing the diagram and labeling the vectors for acceleration. This will reduce the chance of you making that silly mistake again
THSCStudyOnly:
Ye, lesson learn't. The wordiness of the question gets to me (especially in an exam setting). I got to read the question again and again until I completely understand it.
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