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

Well, there's a difference between 'prioritising' exams and forgetting about them.

Hardly any of the standard questions came up.. What are OCR playing at? Literally.. I feel like 75% of the G484 specification wasn't even touched upon in that exam.. Where were all the definitions for additional marks? Where was Brownian motion? Kinetic theory of gases & assumptions? Experiments? CIRCULAR MOTION?

Ah I'm hoping they make the bigger unit easier since its worth more.. Seriously can't get over how every single OCR science exam has been a mockery.. One or two are fine to test your understanding.. But every one of them doesn't really give many people a chance


Posted from TSR Mobile

erm I messed up Q1, 2a, and didn't recognise the damping and resonance graphs as damping and resonance. I just tried to think through them using the equations.
In short I did much worse than I should have. And I need an A* for my firm choice uni.

Posted from TSR Mobile

i COMPLETELY agree. Considering these are the last papers on this spec too, doesn't give much hope either. I'm dreading f325 and g485. feel sick.

Now I really want to see the QP because I feel like I read a completely different question to you

You can't create that much mass. The LHC creates gold nuclei from converting energy to mass. You'd think they could make a profit from it but no - even at those massive energies it would take billions of years to create a few grams of it so I don't know what you're on about.

Guys in question two. I read the time as seconds not ms. So I got a wrong impulse. How many marks will I lose? Also for the following part where it said how would the acceleration vary over the time period I wrote 1-3 seconds and not ms. Will I lose all marks for just reading s instead of ms?

I thought that as well, but I'm certain the question said "Xenon ions are created". I thought it must have something to do with the solar power, ie energy converted to mass or something :P

Yeah because it ionised the Xenon atoms

Posted from TSR Mobile

Even though I know I'm wrong, you said energy was nowhere near enough.

It would be from the sun, to create the mass needed per second, but the conditions wouldn't be there.

But a straight E=mc², there is plenty of solar energy to form the mass of those ions

The Xenon was already in the spacecraft, the Sun's energy powered its electronics which in turn would power the component that would ionise the Xenon atoms and shoot them out with an electric field

Panels give power on the order of hundreds of Watts in space, and working that through you could get about 2.5x10^10 Xenon ions per second if ALL of that energy went into making matter (and if it was actually possible to convert energy to matter like that, which it's not). But I see what you mean, you get non-negligible values by the E=mc^2 argument

I thought that as well, but I'm certain the question said "Xenon ions are created". I thought it must have something to do with the solar power, ie energy converted to mass or something :P

Did you not stop and think that your answer might be a tiny bit too small for the mass of a planet...some people have no common sense.

Could just be a small planet, or not very dense. I did think it was small but for some reason I didn't notice the units.

99% sure it asked to calculate the mass of the star and not a planet.

360-210=150/300 for C

150-48=102/240

So you need 102/240 for exams

Let's say you get highest U possible

35/90

102-35=67/150

So you need 67/150 in G485

So you need an E in g485 for a C overall

Might as well aim for a B! In which case you would need 127/150 (low-mid A)