OCR Physics A - G484 The Newtonian World Watch

Clarity Incognito
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#161
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#161
(Original post by Katermerang)
It didn't say momentum was conserved, it said " the momentum of each of the particles is the same" this dose not occur in inelastic collisions.
Dangnabbit, is that what it said?? my bad, can't even remember it.

Someone confirm that the total energy for that graph was just a line at the top please
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skipp
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#162
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That paper seemed slightly too easy...which in my world means I've made a lot of silly mistakes :s: I also got 1 & 3 for the multiple choice
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Katermerang
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(Original post by Clarity Incognito)
Dangnabbit, is that what it said?? my bad, can't even remember it.

Someone confirm that the total energy for that graph was just a line at the top please
I'm pretty sure It said that, I'm sure I would have ticked it if it said something as simple as momentum is conserved. Only one mark though.

Yes one of the lines was just a horizontal one passing through 18mJ.
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DanPok
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#164
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I got 1 and 3 for the multiple choice too, why are people saying you had to divide through by 4? the question gave you the seperate weight of each disk break of 1.2kg.

if it'd have given you 4.8kg as the total mass of all 4 then yes you'd have had to divide through by 4.
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Katermerang
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(Original post by DanPok)
I got 1 and 3 for the multiple choice too, why are people saying you had to divide through by 4? the question gave you the seperate weight of each disk break of 1.2kg.

if it'd have given you 4.8kg as the total mass of all 4 then yes you'd have had to divide through by 4.
Because the energy was shared equally between them, so you had to divide it by four to get the energy change for each.
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Katermerang
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(Original post by hoddy)
That means that graph K was a flipped over potential energy graph ?
Yes.
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DanPok
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#167
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#167
(Original post by Clarity Incognito)
Dangnabbit, is that what it said?? my bad, can't even remember it.

Someone confirm that the total energy for that graph was just a line at the top please
yes it was mate
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charliet99
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#168
er for the geostationary orbit it didn't say didstance from the surface, and it didnt tell us the radius of earth, also the diagram of r had it to the centre of the earth. was i right by not deducting the radius of earth
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Katermerang
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#169
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#169
(Original post by charliet99)
er for the geostationary orbit it didn't say didstance from the surface, and it didnt tell us the radius of earth, also the diagram of r had it to the centre of the earth. was i right by not deducting the radius of earth
Yes, gravitational forces always act from the centre of mass of an object not its surface.
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DanPok
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#170
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(Original post by charliet99)
er for the geostationary orbit it didn't say didstance from the surface, and it didnt tell us the radius of earth, also the diagram of r had it to the centre of the earth. was i right by not deducting the radius of earth
It didn't give us the radius of the earth so there was no need
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DanPok
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(Original post by hoddy)
Not sure If I remember this one correctly, but for the pressure in the ball at 0C. I got 2.45 x 10^5 Pa, this ring a bell with anyone?
yup was right and the mass of air as 0.017 rounded up to 0.02 kg
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Katermerang
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#172
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(Original post by hoddy)
Not sure If I remember this one correctly, but for the pressure in the ball at 0C. I got 2.45 x 10^5 Pa, this ring a bell with anyone?
Yes I think I got that or 2.44 x 10^5 Pa, depending on rounding.
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skipp
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#173
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(Original post by charliet99)
er for the geostationary orbit it didn't say didstance from the surface, and it didnt tell us the radius of earth, also the diagram of r had it to the centre of the earth. was i right by not deducting the radius of earth
Wait...diagram? I don't remember drawing one :afraid:

*hopes it was just something you did to help yourself answer the question*

And forgot there were 4 brake pads :facepalm: thought my answers were a little high...well there goes a chunk of marks :s:
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Katermerang
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(Original post by skipp)
Wait...diagram? I don't remember drawing one :afraid:

*hopes it was just something you did to help yourself answer the question*
At the bottom of the page that came before the question, it had no relevance to the question.
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skipp
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#175
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(Original post by Katermerang)
At the bottom of the page that came before the question, it had no relevance to the question.
Ah ok
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edris
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(Original post by zoolander0110)
done!!!!!!!!!!!!!!!!!! was an nice one to finnish. did you get 0.016 for mass of air in ball?
Yes, spot on!
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Kd3239
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#177
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what did you get for the radius ( geostationary orbit question) ? i got 9.5 x10^5 i think
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DanPok
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#178
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(Original post by Kd3239)
what did you get for the radius ( geostationary orbit question) ? i got 9.5 x10^5 i think
tis what i got but i think its wrong
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Remarqable M
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#179
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#179
(Original post by Kd3239)
what did you get for the radius ( geostationary orbit question) ? i got 9.5 x10^5 i think
im pretty sure it was 4.23 x 10^7 m
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Kd3239
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#180
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#180
did u use 1 day or change it to seconds?
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