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

imfrassin
Badges: 2
Rep:
?
#1641
Report 3 years ago
#1641
(Original post by 123bensufc)
didnt they ask for the change in velocity on this question? i got 11/180 as the change in velocity 11Ns for area under graph
That's what I did cos I swear I= mass times change in velocity lol
I got I as 10.8, Deffo will be a +-2 range I guess
0
reply
MMB07
Badges: 1
Rep:
?
#1642
Report 3 years ago
#1642
For the resonance graph what did people draw? Isn't the resonance graph Amp vs Freq but it said that Amp was constant????
0
reply
L'Evil Fish
Badges: 18
Rep:
?
#1643
Report Thread starter 3 years ago
#1643
(Original post by Elcor)
For the last part of the first question I ended up with

d=\frac{2u^2}{g_M} \sin \theta \cos \theta
I got

it to be -sin2theta/a * u²

Where a would have been a negative value as I took up to be positive

My double angle formula ye
0
reply
baner-2003
Badges: 0
Rep:
?
#1644
Report 3 years ago
#1644
Actually wanna dissapear. Bye bye medicine


Posted from TSR Mobile
0
reply
ibanezmatt13
Badges: 2
Rep:
?
#1645
Report 3 years ago
#1645
(Original post by Elcor)
For the last part of the first question I ended up with

d=\frac{2u^2}{g_M} \sin \theta \cos \theta
I had this too. I was a little confused when I had the product of sin and cos, I didn't see how that would be constant. I just wrote a little note and said "product of sin and cos is constant here"

Did they say to assume the angle of trajectory was constant?
0
reply
Flux_Dubstep
Badges: 3
Rep:
?
#1646
Report 3 years ago
#1646
(Original post by MMB07)
For the resonance graph what did people draw? Isn't the resonance graph Amp vs Freq but it said that Amp was constant????
It meant the amplitude of the oscillator was constant
0
reply
maattwileman
Badges: 3
Rep:
?
#1647
Report 3 years ago
#1647
A* will be lower that 43 guaranteed.
0
reply
Elcor
Badges: 13
Rep:
?
#1648
Report 3 years ago
#1648
(Original post by L'Evil Fish)
I got

it to be -sin2theta/a * u²

Where a would have been a negative value as I took up to be positive

My double angle formula ye
Same as me then, but I got it as positive because I took into account directions in my suvat.

Mate don't confuse the examiner with double angles, pretty sure the most complicated equation they know is speed=distance/time
1
reply
ibanezmatt13
Badges: 2
Rep:
?
#1649
Report 3 years ago
#1649
(Original post by MMB07)
For the resonance graph what did people draw? Isn't the resonance graph Amp vs Freq but it said that Amp was constant????
It said the amplitude of the oscillator oscillating it was constant, not the spring/plate thing itself.
0
reply
Flux_Dubstep
Badges: 3
Rep:
?
#1650
Report 3 years ago
#1650
(Original post by Elcor)
For the last part of the first question I ended up with

d=\frac{2u^2}{g_M} \sin \theta \cos \theta
Yeah I got this, so s was proportional to u^2 with the other stuff as constant
0
reply
Elcor
Badges: 13
Rep:
?
#1651
Report 3 years ago
#1651
(Original post by ibanezmatt13)
I had this too. I was a little confused when I had the product of sin and cos, I didn't see how that would be constant. I just wrote a little note and said "product of sin and cos is constant here"

Did they say to assume the angle of trajectory was constant?
I didn't say that, I just assumed it was obvious and concluded with 'Hence d \propto u^2'

You can't have the golf ball being hit, then its initial angle of trajectory changing mid-flight lol. Good of you to state it though, hopefully I haven't lost a mark there.
0
reply
ETRC
Badges: 17
Rep:
?
#1652
Report 3 years ago
#1652
(Original post by ellisvlad)
I put that Newton's law of gravitation states that any two point masses attract each other with a force directly proportional to the product of their masses and inversely proportional to the square of their distance. I'm sure that'll be fine for one mark... right?
no idea
i'm sure ocr is gonna find a way to mess us up even more with their crap
0
reply
Elcor
Badges: 13
Rep:
?
#1653
Report 3 years ago
#1653
(Original post by Flux_Dubstep)
Yeah I got this, so s was proportional to u^2 with the other stuff as constant
At first I wrote my suvat variables as g=9.81ms^-2, then I was like hold on a minute...
0
reply
SH0405
Badges: 13
Rep:
?
#1654
Report 3 years ago
#1654
(Original post by maattwileman)
A* will be lower that 43 guaranteed.
That seems slightly too low.
1
reply
ibanezmatt13
Badges: 2
Rep:
?
#1655
Report 3 years ago
#1655
(Original post by Elcor)
I didn't say that, I just assumed it was obvious and concluded with 'Hence d \propto u^2'

You can't have the golf ball being hit, then its initial angle of trajectory changing mid-flight lol. Good of you to state it though, hopefully I haven't lost a mark there.
Yeah hopefully

Theta varies throughout motion though unless they say to assume it doesn't. Need an unofficial ms
0
reply
TadiwaM
Badges: 0
Rep:
?
#1656
Report 3 years ago
#1656
Unofficial mark scheme?
0
reply
Flux_Dubstep
Badges: 3
Rep:
?
#1657
Report 3 years ago
#1657
(Original post by Elcor)
At first I wrote my suvat variables as g=9.81ms^-2, then I was like hold on a minute...
Yeah I reckon a few people will have done that
0
reply
SH0405
Badges: 13
Rep:
?
#1658
Report 3 years ago
#1658
Has anyone got the paper itself?
0
reply
Flux_Dubstep
Badges: 3
Rep:
?
#1659
Report 3 years ago
#1659
(Original post by ibanezmatt13)
Yeah hopefully

Theta varies throughout motion though unless they say to assume it doesn't. Need an unofficial ms

Theta was the angle at launch
0
reply
[email protected]
Badges: 9
#1660
Report 3 years ago
#1660
(Original post by SH0405)
That seems slightly too low.
that is what it was last year
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Thu, 25 Apr '19
  • University of the Arts London
    Open day: MA Footwear and MA Fashion Artefact Postgraduate
    Thu, 25 Apr '19
  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (264)
38.94%
No - but I will (46)
6.78%
No - I don't want to (51)
7.52%
No - I can't vote (<18, not in UK, etc) (317)
46.76%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise