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

L'Evil Fish
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#1001
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#1001
(Original post by Ayjayroo)
Attachment 424869Could 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
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Ki Yung Na
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#1002
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#1002
(Original post by Ayjayroo)
Attachment 424869Could 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
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Louise6061
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#1003
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#1003
(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
I think last year they made the graph velocity time rather than displacement time.
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boristeve
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#1004
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#1004
(Original post by Louise6061)
They may change up the graphs, just double check what the Y axis is
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!
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Faded-Pi
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#1005
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#1005
Am I right in saying that molar mass/Avogadro's constant = mass of a single molecule?

Oops, silly question- just realised.
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[email protected]
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#1006
wanting lots of show thats
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saeed97
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#1007
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#1007
(Original post by laureeenk)
How can they over complicate SHM? Any weird questions they could ask?
Its OCR, I wouldnt put it past them.
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[email protected]
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#1008
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#1008
(Original post by Faded-Pi)
Am I right in saying that molar mass/Avogadro's constant = mass of a single molecule?
yes

=
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laureeenk
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#1009
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#1009
(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
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[email protected]
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#1010
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#1010
(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
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[email protected]
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#1011
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#1011
Can anyone list all the bullet points for Brownian motion

and all the experiments we are meant to know#?
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seizetoday
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#1012
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#1012
At the top of a loop why does the pilot experience the sensation of weightlessness?
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Raizel
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#1013
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#1013
(Original post by Ayjayroo)
Attachment 424869Could anyone please enlighten me on this? Thanks!
I have some dead handwriting but here bro.
Attached files
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dudeman1
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#1014
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#1014
can someone give a summary of all the experiments that are likely to come up
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saeed97
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#1015
(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
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Raizel
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#1016
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#1016
(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.
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laureeenk
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#1017
(Original post by [email protected])
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?
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boristeve
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#1018
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#1018
(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
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[email protected]
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#1019
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#1019
(Original post by seizetoday)
At the top of a loop why does the pilot experience the sensation of weightlessness?
No workdone
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Ayjayroo
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#1020
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#1020
(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
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