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

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
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
#1643
(Original post by Elcor)
For the last part of the first question I ended up with

I got

it to be -sin2theta/a * uÂ²

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

My double angle formula ye
0
3 years ago
#1644
Actually wanna dissapear. Bye bye medicine

Posted from TSR Mobile
0
3 years ago
#1645
(Original post by Elcor)
For the last part of the first question I ended up with

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
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
3 years ago
#1647
A* will be lower that 43 guaranteed.
0
3 years ago
#1648
(Original post by L'Evil Fish)
I got

it to be -sin2theta/a * uÂ²

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
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
3 years ago
#1650
(Original post by Elcor)
For the last part of the first question I ended up with

Yeah I got this, so s was proportional to u^2 with the other stuff as constant
0
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 '

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
3 years ago
#1652
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
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
3 years ago
#1654
(Original post by maattwileman)
A* will be lower that 43 guaranteed.
That seems slightly too low.
1
3 years ago
#1655
(Original post by Elcor)
I didn't say that, I just assumed it was obvious and concluded with 'Hence '

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
3 years ago
#1656
Unofficial mark scheme?
0
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
3 years ago
#1658
Has anyone got the paper itself?
0
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
3 years ago
#1660
(Original post by SH0405)
That seems slightly too low.
that is what it was last year
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