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

3 years ago
#1321
all of those graphs amiright
1
3 years ago
#1322
was the paired force of W : the equipment pulling the moon towards it, acting at the centre of the moon with magnitude = W?
0
3 years ago
#1323
What on earth was question 1 and 2?? I think I might have got the last 3 marks for question 1 but the rest there is no way. Question 2 I think I might have got but it was just weird.

Anyone know what answer to first part of q1 was??

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0
3 years ago
#1324
(Original post by The Room Student)
Bloody hell aha! I used 2 triangles and 2 rectangles to guesstimate it. Got 10.9 though so that's probably good news for both of us?!
I got 11.1 for the impulse, then divided by mass. But is that really it for 4 marks?

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0
3 years ago
#1325
(Original post by ooftar)
I said it would increase because the mass of the spacecraft will be decreasing because the ions are being emitted

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Same here. Had to be careful because a = F / m is only true for constant mass but I think we're right...
0
3 years ago
#1326
(Original post by Red Fox)
How did the acceleration change if the engine was left running?
the mass decreases as ions are ejected i think
0
3 years ago
#1327
(Original post by Help_Me_Alex)
to work out the acceleration of the spacecraft do (mass of xenon)x(speed of xenon)/(mass of spacecraft - mass of xenon)
I think it said something in the question about the mass remaining the same? Because then later on it asked what would you expect to happen to the acceleration as the engine is left running? Which I said a will increase as the mass will be decreasing ?
0
3 years ago
#1328
I've failed physics after that...
0
3 years ago
#1329
(Original post by trooken)
I got 11.1 for the impulse, then divided by mass. But is that really it for 4 marks?

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Nice, we're pretty close, what method did you use?

I think M1 for saying area = mv, then M2 for summing up, maybe M3 for an accuracy mark and then M4 as the final (correct within a range) answer.
0
3 years ago
#1330
Can someone setup an opinion poll please?
0
3 years ago
#1331
(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
Exactly the same as what I got!
1
3 years ago
#1332
(Original post by Jim997)
I think it said something in the question about the mass remaining the same? Because then later on it asked what would you expect to happen to the acceleration as the engine is left running? Which I said a will increase as the mass will be decreasing ?
I just used the mass of the spacecraft. I don't think F=ma would apply if you counted the decrease in mass due to the ions?
0
3 years ago
#1333
(Original post by Help_Me_Alex)
was the paired force of W : the equipment pulling the moon towards it, acting at the centre of the moon with magnitude = W?
That's what I said pretty sure it's right 👍
0
3 years ago
#1334
(Original post by L'Evil Fish)
**** lmao

Couldn't do first 2 questions... Like left some blank

Last half of paper was fine
completely agree with this. sums it up

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0
3 years ago
#1335
Try 1/356 hahaha
0
3 years ago
#1336
(Original post by The Room Student)
Yeah that was my dilemma... I'd used 2nd Law and 3rd Law!

I went for 3rd Law after deliberating it. Rocket physics is a common example of it. Not sure though.
Probably both will work i guess, it did ask which law you used and if you used both they cant penalise you for writing either
0
3 years ago
#1337
Did anyone get 1.27×10^-5 or something for the spaceship's acceleration?
0
3 years ago
#1338
last years grade boundaries were 39/60 for an A right? im hoping they'll be that low this year too. the first question really threw me off
0
3 years ago
#1339
and the titanium thing 1) was that time taken really small ?
2) Why would it take longer , heat lost to other titanium and surroundings... what else?
0
3 years ago
#1340
It was the hardest exam paper i have ever seen 😥😥
0
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