Stupid Physics.

Did you write about how the mass depends on whether it becomes a black hole or a white dwarf? I mentioned those, and I mentioned the interstellar gas clouds earlier on, but I forgot to mention the thermonuclear fusion and the neutron star and planetary nebula. ):

Reply 29

Sandhu

2

Yep I did

For the beginning of the star I mentioned hydrogen collapsing and thermonuclear fusion and the proto star.

I the end I said "The stars fate is dependant on its mass. If it was a heavyweight start supernova takes place and it becomes a neutron star or a blackhole. If it was a medium weight star planetary nebula takes place and it becomes a white dwarf."

Reply 30

Sandhu

2

The microwave one was a bitch :frown:

Fairly simple but I couldn't really remember lol.

Reply 31

Elitist

14

Oop. I've written nothing of the sort. :redface:

Oh well, I'd settle for 2 marks on the star question.

I got the microwave question, but I was a taad confused about why they would have to leave it for a couple of minutes before eating; so I mentioned 2 points for that, in case one of them's wrong.

EDIT: Did you mention the microwaves penetrating the surface a few mm and then being conducted to the centre of the food via the water particles for why it heats up quickly? It better be right. :s-smilie:

Reply 32

Sandhu

2

Princess

Oop. I've written nothing of the sort. :redface:

Oh well, I'd settle for 2 marks on the star question.

I got the microwave question, but I was a taad confused about why they would have to leave it for a couple of minutes before eating; so I mentioned 2 points for that, in case one of them's wrong.

EDIT: Did you mention the microwaves penetrating the surface a few mm and then being conducted to the centre of the food via the water particles for why it heats up quickly? It better be right. :s-smilie:

I wrote they have to leave it 2 mins so the heat can circulate the food properly. And yep that exactly what I wrote for your edit, thats also why the dry toast didnt cook in it. :smile:

Reply 33

sonicandfffan

Physics is my strongest science, but a whole week of exams finally got to me and I miscalculated on the questions about the stairs.

*sigh* I hope the other 63 marks are right.

Reply 34

RainbowGurl

7

i thought it was easy compared to what i expected lol.

i did get caught out on the uses of alpha and beta :s but got the same answers as yous for the other qs mentioned :smile:

x

Reply 35

Venom123

OP

16

Yeah i agree with Sonic
I was just tired an Exam almost everyday the past two weeks got to me
I couldn't even botherd to revise - well thats life eh

Reply 36

Sandhu

2

Venom123

Yeah i agree with Sonic
I was just tired an Exam almost everyday the past two weeks got to me
I couldn't even botherd to revise - well thats life eh

Same here man. I just crammed a day before, I'm thankful it was am easier test.

Reply 37

rotor

14

Lol I crammed so much, I actually couldn't be bothered towards the end.
Was a good paper, HATED the stupid star question though.

Reply 38

Madigan

I'm actually quite happy with how the exam went. I did the last question first, the basic structure I used was:

* Instellar gas clouds that are inbetween stars are pulled together by gravity to form a proto-star.
* Kinetic energy is converted to thermal energy through the movement of the particles.
*As the temperature increases, thermonuclear fusion occurs and hydrogen is converted into helium.
* When the supply of hydrogen runs out the star begins to expand and forms a red giant.
* The next stage is dependent on the mass, if it is a main sequence star, like our sun, it will form planetary nebula. The outer gas clouds will float away leaving the core to contract and cool, until it finally becomes a white dwarf.
* If the mass is great then the star will explode into a supernova and ultimately form either a black hole or a pulsar.

I think you had to do four calculations in the exam:

1.) The one about which light was the brightest. I got 0.05 Amps for the missing value and put down 4 as the brightest for two different reasons. The first being that it had the most current and secondly because it had the least resistance.

2.) I think this was the one about that girl going up the stairs (did anyone observe that she actually looked like a man? :smile:

)

I used:

W = F x s (distance)

600N x 60m = 3600 J.

That was one of the only ones I wasn't sure of, what did everyone else get?

3.) The cars. This was pretty basic but for the final answer I got 13.8 after rounding it.

4.) The charge one?

I can't remember the exact figures, but I know I got 500A.

Radiation question = 11 marks! That's a sixth of the paper and the questions on it were really short and simple :biggrin:

Reply 39

8

Madigan

4.) The charge one?

I can't remember the exact figures, but I know I got 500A.

Sorry to be the bearer of bad news but im afraid thats the wrong answer. i did the same mistake, only realised until after the exam :mad:

For this charge question it said "8 minutes" so u had 2 convert it into seconds making it 480. and the answer that u should have had was something along the lines of 8.3A. But hopefully you'll get at least 1 or 2 marks outa the 3 for ur formula and stuff :smile:

oh yeh and what did u lot get 4 the ideas and evidence in science questions. the one about using the sun, wind and moving sea as electricity and the one about galileo with the moving stars

GCSE Double Award Physics - OCR Spec B - Higher - How'd it go

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