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OCR Physics A G484 - The Newtonian World - 11th June 2015

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Original post by Ayjayroo
a080762c65b639a98ec321f04bd831be.pngCould anyone please enlighten me on this? Thanks!


F = GMm/r²

mv²/r = GMm/r²
v² = GM/r
(2Pir/T)² = GM/r
4pi²r² = GMT²/r
T² = (4pi² r³) /GM
Original post by Ayjayroo
a080762c65b639a98ec321f04bd831be.pngCould anyone please enlighten me on this? Thanks!


Equate Newton's gravitational law with centripetal force. Rearrange to get v. Use the found v in the circular motion equation:
T=(2 pi r)/v
Original post by laureeenk
How can they over complicate SHM? Any weird questions they could ask?


They may change up the graphs, just double check what the Y axis is :smile:
I think last year they made the graph velocity time rather than displacement time.
Original post by Louise6061
They may change up the graphs, just double check what the Y axis is :smile:
I think last year they made the graph velocity time rather than displacement time.


also the units of the graphs, check for ms or whatever! :smile:
Am I right in saying that molar mass/Avogadro's constant = mass of a single molecule?

Oops, silly question- just realised.
(edited 8 years ago)
wanting lots of show thats
Original post by laureeenk
How can they over complicate SHM? Any weird questions they could ask?


Its OCR, I wouldnt put it past them.
Original post by Faded-Pi
Am I right in saying that molar mass/Avogadro's constant = mass of a single molecule?


yes

=
Original post by saeed97
Its OCR, I wouldnt put it past them.


just trying to get any little bits down that they could throw at us
Original post by laureeenk
just trying to get any little bits down that they could throw at us


Sadly we cant know they are going to ask atleast a few funky ones
Can anyone list all the bullet points for Brownian motion

and all the experiments we are meant to know#?
At the top of a loop why does the pilot experience the sensation of weightlessness?
Original post by Ayjayroo
a080762c65b639a98ec321f04bd831be.pngCould anyone please enlighten me on this? Thanks!


I have some dead handwriting but here bro.
IMG_20150610_181937.jpg395.1KB
can someone give a summary of all the experiments that are likely to come up
Original post by laureeenk
just trying to get any little bits down that they could throw at us


Maybe a brick this time? jk but good luck :smile:
Original post by seizetoday
At the top of a loop why does the pilot experience the sensation of weightlessness?


because the weight component at the top is providing some of the centripetal force and there is no contact resistance between him and the seat.
something along them lines.
Original post by chem@uni
Sadly we cant know they are going to ask atleast a few funky ones


I know and that's the annoying part :/

what's the most difficult or awkward thing that could come up?
(edited 8 years ago)
Original post by seizetoday
At the top of a loop why does the pilot experience the sensation of weightlessness?


there is no reaction force acting on the pilot from his seat. the pilots weight force supplies the necessary centripetal force for circular motion, so no reaction force = apparent weightlessness
Original post by seizetoday
At the top of a loop why does the pilot experience the sensation of weightlessness?


No workdone
Original post by L'Evil Fish
F = GMm/r²

mv²/r = GMm/r²
v² = GM/r
(2Pir/T)² = GM/r
4pi²r² = GMT²/r
T² = (4pi² r³) /GM


Thank you all very much :smile:

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