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

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

For the last part of the first question I ended up with

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

For the last part of the first question I ended up with

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

For the resonance graph what did people draw? Isn't the resonance graph Amp vs Freq but it said that Amp was constant????

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

For the resonance graph what did people draw? Isn't the resonance graph Amp vs Freq but it said that Amp was constant????

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?

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?

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

A* will be lower that 43 guaranteed.

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.

At first I wrote my suvat variables as g=9.81ms^-2, then I was like hold on a minute...

Yeah hopefully

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

That seems slightly too low.