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

Rob-Condom
Badges: 1
Rep:
?
#1321
Report 3 years ago
#1321
all of those graphs amiright
1
reply
Help_Me_Alex
Badges: 1
Rep:
?
#1322
Report 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
reply
k4l397
Badges: 18
Rep:
?
#1323
Report 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??

Posted from TSR Mobile
0
reply
trooken
Badges: 2
Rep:
?
#1324
Report 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?

Posted from TSR Mobile
0
reply
The Room Student
Badges: 2
Rep:
?
#1325
Report 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


Posted from TSR Mobile
Same here. Had to be careful because a = F / m is only true for constant mass but I think we're right...
0
reply
Spirande
Badges: 2
Rep:
?
#1326
Report 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
reply
Jim997
Badges: 2
Rep:
?
#1327
Report 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
reply
Jmw123
Badges: 3
Rep:
?
#1328
Report 3 years ago
#1328
I've failed physics after that...
0
reply
The Room Student
Badges: 2
Rep:
?
#1329
Report 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?

Posted from TSR Mobile
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
reply
PaulCJH
Badges: 1
Rep:
?
#1330
Report 3 years ago
#1330
Can someone setup an opinion poll please?
0
reply
Jim997
Badges: 2
Rep:
?
#1331
Report 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
reply
BrokenS0ulz
Badges: 3
Rep:
?
#1332
Report 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
reply
Jim997
Badges: 2
Rep:
?
#1333
Report 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
reply
rachelc142
Badges: 11
Rep:
?
#1334
Report 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

Posted from TSR Mobile
0
reply
Freddingbat
Badges: 0
Rep:
?
#1335
Report 3 years ago
#1335
Try 1/356 hahaha
0
reply
coder4
Badges: 2
Rep:
?
#1336
Report 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
reply
Jamesowl
Badges: 0
Rep:
?
#1337
Report 3 years ago
#1337
Did anyone get 1.27×10^-5 or something for the spaceship's acceleration?
0
reply
JayGreen
Badges: 1
Rep:
?
#1338
Report 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
reply
Help_Me_Alex
Badges: 1
Rep:
?
#1339
Report 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
reply
heetz_96
Badges: 0
Rep:
?
#1340
Report 3 years ago
#1340
It was the hardest exam paper i have ever seen 😥😥
0
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! (368)
37.28%
No - but I will (74)
7.5%
No - I don't want to (69)
6.99%
No - I can't vote (<18, not in UK, etc) (476)
48.23%

Watched Threads

View All