# Physics Edexcel Unit 1 (Old syllabus) 14 May 2019 (WPH01)Watch

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6 days ago
#41
(Original post by mechguffin)
The original length was 0.70 meters.

What I don't understand is this, how come our total length must be ≤ 1 mm but our original length is 0.70 meters???

I didn't try to do any cos/sin function with the rope length (I think weight has nothing to do with those functions) so my extension came out to be something like 1.46 * 10^-4 meter or 0.13 mm or something which I added up to my original length and said it was safe since I assumed I haven't crossed the 1 mm line. Idk but were you supposed to assume that 1mm is 1 meters or something??

Overall, this was a freaking hard exam imo. I think, I didn't answer like 4-5 sub-questions since I ran out of time. Really don't know why they are making the recent questions so much harder
It was the extension length that had to be less than 1mm, not the total length.
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6 days ago
#42
(Original post by Kamel1023)
What answer did you get for workdone in maximum pull back distance
Uhh, something like 0.8 Joules I think since I had to convert the whole graph into 1 triangle and 3-4 trapeziums etc
(Original post by 686868t)
what about the energy question when you had to explain why the gpe is much less than the total energy thing question
I wrote that, GPE is lesser than work done since the car had to climb up a ramp, so some energy was converted to heat due to the friction with the ramp's surface etc
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6 days ago
#43
the question state that the original length shudnt eexceed 1mm for safety concerns ? So the extension was 0.7 something n aren't we suppose to add that extension to the original length 🙄
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6 days ago
#44
(Original post by 686868t)
It was the extension length that had to be less than 1mm, not the total length.
I'm safe then lol
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Thread starter 6 days ago
#45
(Original post by Nethmi Tharaka)
the question state that the original length shudnt eexceed 1mm for safety concerns ? So the extension was 0.7 something n aren't we suppose to add that extension to the original length 🙄
Really?
Well as far as i can remember the question asked for the extension. Idk
I calculated the value for extension in mm and compared it to 1mm.
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6 days ago
#46
Extension is 0.5 mm
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6 days ago
#47
In finding the work done i just did force and distance i didnt find the area under graph
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6 days ago
#48
I don't think you need to find the are because it was just a 2/3 mark question...I did the same thing
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6 days ago
#49
Added this to the exam index here so hopefully people will see the thread.

Hope this went well for everyone.
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6 days ago
#50
does anyone remember the drag question where there was a graph of temperature and stuff? did u choose the force at room temperature
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6 days ago
#51
No u use 23°c

(Original post by 686868t)
does anyone remember the drag question where there was a graph of temperature and stuff? did u choose the force at room temperature
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6 days ago
#52
(Original post by Kamel1023)
No u use 23°c
why.
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6 days ago
#53
Because at this particular temp of ethanol the sphere remains stationary so weight=upthrust and u calculate upthrust to get weight
(Original post by 686868t)
why.
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6 days ago
#54
(Original post by Kamel1023)
Because at this particular temp of ethanol the sphere remains stationary so weight=upthrust and u calculate upthrust to get weight
if i used 25 would it be wrong?
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6 days ago
#55
Im not sure
(Original post by 686868t)
if i used 25 would it be wrong?
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6 days ago
#56
I guess you will loose like 1 mark
(Original post by Kamel1023)
Im not sure
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6 days ago
#57
(Original post by Kamel1023)
Im not sure
but how did you conclude the temperature to be 23?
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6 days ago
#58
They mentioned in the question what is the weight of the sphere and disc marked 23
(Original post by 686868t)
but how did you conclude the temperature to be 23?
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6 days ago
#59
And in the question they said the numbers correspond to temperature of ethanol
(Original post by Kamel1023)
They mentioned in the question what is the weight of the sphere and disc marked 23
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Thread starter 6 days ago
#60
But they did not say the 23 marked sphere means it's temperature is 23°c.
It said temperatures where marked on the discs not on the sphere? idk.
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