OCR Gateway GCSE Physics (9-1) J249H 23rd May + 15th June 2018 [Exam Discussion]

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are you talking about the trolley thing?
and how tf did you do the rock one? i was so confused because we werent given distance or mass?

SUvat wasn’t even necessary for the rock one:
T = 2.2
A = 10 (acceleration due to gravity)
v - 0 = at (rearranged from a= change in velocity over time

2.2 x 10 = 22 m/s

Reply 21

jamesgillian123

Original post by Luminescence0

You were supposed to use the Earth's gravitation field strength of 10m/s^2 or 9.8 or 9.81.
Initial velocity was 0 as the stone was released from rest.

v=u+at

A lot of people on twitter are meming this question. :rofl:

ah i see, so what did u get as the answer? i think i did 22 x 9.81 or something in the end
:frown:

Reply 22

Cat?

Original post by stoneroses2828

SUvat wasn’t even necessary for the rock one:
T = 2.2
A = 10 (acceleration due to gravity)
v - 0 = at (rearranged from a= change in velocity over time

2.2 x 10 = 22 m/s

You literally just used a suvat equation to do it.

Reply 23

Cat?

Original post by jamesgillian123

ah i see, so what did u get as the answer? i think i did 22 x 9.81 or something in the end
:frown:

I chose g=9.8, so I got 21.56 as the answer.

Reply 24

jamesgillian123

Original post by Luminescence0

I chose g=9.8, so I got 21.56 as the answer.

omg so u just x the speed by 9.81 ??

Reply 25

Cat?

Original post by jamesgillian123

omg so u just x the speed by 9.81 ??

Yes because initial velocity is 0.

Reply 26

jamesgillian123

Original post by Luminescence0

Yes because initial velocity is 0.

holy **** i have no idea what all is suvat stuff is haha im so happy i got that right lmao

Reply 27

sss09

Will my answer be marked if I wrote outside of the four black shapes in the corners of the page?

Reply 28

CamEoj

Original post by stoneroses2828

Was the speed for the rock question 22 m/s ?

Yes!

Reply 29

CamEoj

Original post by sss09

Will my answer be marked if I wrote outside of the four black shapes in the corners of the page?

When the paper is scanned, they dont scan the black bit. The paper is marked from a computer so the examiner won't see whatever you wrote outside of it.
However if it's obvious that something is missing as you've gone out of the lines, i believe the examiner can request the physical paper

was awful

What did you guys say for the 2 errors while recording and using the table for the resistance and length of wire question??

Reply 32

Cat?

Original post by Nachi2904

What did you guys say for the 2 errors while recording and using the table for the resistance and length of wire question??

Anomaly in the table.
Mean incorrectly calculated in one of the rows.

Reply 33

Nachi2904

Original post by Luminescence0

Anomaly in the table.
Mean incorrectly calculated in one of the rows.

Thanks. I said that the data was rounded to different significant figures.

Reply 34

J_wst13

Original post by Luminescence0

Anomaly in the table.
Mean incorrectly calculated in one of the rows.

Was the mean one for the 50cm wire length, and 16 mean?

Reply 35

OhDear XD

Oh well I messed up 😂😂. Got none of these answers.

Reply 36

Aryananubis

Original post by OhDear XD

Oh well I messed up 😂😂. Got none of these answers.

What did you guys get for today’s physics test , question , where it asked for the wavelength of ultraviolet in nano meters?

I got 1*10 to the power of 23??

Reply 37

Cat?

Original post by Aryananubis

What did you guys get for today’s physics test , question , where it asked for the wavelength of ultraviolet in nano meters?

I got 1*10 to the power of 23??

I got 100 nm.

Reply 38

_Dirac_

Original post by Your Local Cat

I got 100 nm.

Same

Reply 39

Aryananubis

Original post by _Dirac_

Same

Wait , did you guys get anywhere in your calculations in which 1*10^-4 came up . Because I think I messed up at that point , limiting me to only 2/3 marks as I identified the correct equation and value for the 3000ghz , but didn’t manage to convert the last bit.

The answer online says it’s 1000nm ( as you will *1000 and *1000 again in which you will then *100 to get the answer)

Also I’m sorry to be like so annoying with my constant questions , but what did you get for the first three questions

I got : 5.9 tonnes , oil and 83% I think ( for the last one I did the value of coal , gas and oil over 10.6)