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Edexcel IAL Physics Unit 1 14 May 2019

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Reply 180

Umm.okay

Same

Original post by 21stylish

what the hell was that efficiency question? and the 10kn in the rope

Original post by saherb

forreal i didnt even know what the useful work would be for the efficiency and the entirety of the rope question i messed up because i started running out of time

Reply 181

21stylish

Original post by Umm.okay

Same

what do you think boundary for an A will be?

Reply 182

saherb

it was 43 for the JAN 2019 one so it should be lower since this was way way way harder

Reply 183

21stylish

Original post by saherb

it was 43 for the JAN 2019 one so it should be lower since this was way way way harder

hopefully. also how did you find the diameter of the firework?

Reply 184

saherb

i literally made stuff up i was like find the difference in times and multiply it by the vertical component of velocity using the angle u found lmao ik its wrong

Original post by 21stylish

hopefully. also how did you find the diameter of the firework?

Reply 185

21stylish

Original post by saherb

i literally made stuff up i was like find the difference in times and multiply it by the vertical component of velocity using the angle u found lmao ik its wrong

i was like find the difference in times. multiply by speed. then use tan theta into adjacent(the distnace traveled)= which equals the opposite length which is the diameter

Reply 186

DeNotoriousOne

For anyone who did the new syllabus how was the paper?
I left he last two pages cause no time and the others idk wht I even wrote... just blabbered some bs
I’m failin for sure unless the grade boundaries are like 20 :cry2:

Reply 187

basilqazi

how did you get 9.3 its supposed to be 13kn right

cause you have mgh = 1/2fx

we find h by first finding height fallen without being stretched so 0.8 x original length of rope

then find the amount rope stretched by

total height fallen = add them together

then algebra for f

Original post by 21stylish

the rope thing i got 9.3 kn but that efficiency question man damn. also the terminal velocity. i didnt see that upthrust was negligible so i prolly lost 8 marks there. Damn. What was the distance you got in the last part?

Reply 188

21stylish

Original post by basilqazi

ah **** nvm. how did you do the moments thing?

Reply 189

basilqazi

i said that you find the distance from center of fire work using speed of sound x time taken
then use sin(psi/2) x distance found to get radius
multply by 2 to get diameter

Original post by 21stylish

i was like find the difference in times. multiply by speed. then use tan theta into adjacent(the distnace traveled)= which equals the opposite length which is the diameter

Reply 190

basilqazi

Original post by 21stylish

ah **** nvm. how did you do the moments thing?

i literally ****ing measured my forearm so estimated at around 45 cm
and got tension at around 140N

cause cos(70) x 4/100 x T = moment of weight of bar + moment of weight of ball basically

Reply 191

21stylish

Original post by basilqazi

i literally ****ing measured my forearm
and got tension at around 140N

cause cos(70) x 4/100 x T = moment of weight of bar + moment of weight of ball basically

LMFAOO yeah i got around 147n . so i think there must be a range. u mean sin(70)?

Reply 192

basilqazi

Original post by 21stylish

LMFAOO yeah i got around 147n . so i think there must be a range. u mean sin(70)?

yeah sorry sin

Reply 193

686868t

Guys PLEASE DID ANYONE DO THE OLD SYLLABUS. I barely finished it and i found it so tricky. grade boundaries?

Reply 194

: ).

wdum u measured ur forearm..i kept getting the whole thing from the pic which was 5.5 cm

Original post by basilqazi

i literally ****ing measured my forearm so estimated at around 45 cm
and got tension at around 140N

cause cos(70) x 4/100 x T = moment of weight of bar + moment of weight of ball basically

Reply 195

21stylish

Original post by : ).

wdum u measured ur forearm..i kept getting the whole thing from the pic which was 5.5 cm

its not to scale plus like 13cm of the beam was already marked

Reply 196

basilqazi

it says diagram is not to scale my man and whos mans got a fore arm the size of 5.5cm i didnt know t rexes still out here

Original post by : ).

wdum u measured ur forearm..i kept getting the whole thing from the pic which was 5.5 cm

Reply 197

mariamlara

My efficiency was 86% and force turned out to be 12kN, velocity of raindrop was around 7m/s.
Tension was about 133N.
I don't know if any of them are correct

Reply 198

basilqazi

for efficiency did you do
mgh/tension in rope x 15 ?

Original post by mariamlara

My efficiency was 86% and force turned out to be 12kN, velocity of raindrop was around 7m/s.
Tension was about 133N.
I don't know if any of them are correct