Physics: Post your doubts here!

[hellodjfos;s'ff]

in the question related to doppler effect , even though the source was going far from the observer but its velocity was decreasing .. when we considered till 8s as mentioned in question. so should'nt the frequency increase

Yes bro, frequency increased. That was a bit of a trick, though it could've easily been noticed.

 

[ThePacifics]

Yes that’s correct

the distance is constant. i forgot to write the F= mg technique but i did write the relationship correctly. i also wrote about letting the sphere charge and reading on top pan balance to get constant to make the final reading. told to measure the diameter of spheres properly so that the distance r is accurate and proper. anything else?

 

[ughkno]

For paper 52, did we have to take 10^3 for the nR to calculate gradient?

it'd be nice if someone answered this lol

 

[Tauqir_hamed]

There were a few tricky questions in paper 22. Overall, how did you find them? I found them a bit tougher than mj 2017

 

[Tauqir_hamed]

it'd be nice if someone answered this lol

I did. and I think we should

 

[anastasia grey113]

which parts did u mess up?

well i got the gradient wrong :/ yepp i took a bad start
n then i made a silly mistake in the last part too
i got a value of 39000 but i wrote it as 3.9 x 10^5 idky -.-
so m defo losing 4 marks in q2

dk abt q1 tho
it was okay

 

[hellodjfos;s'ff]

S17 was surely tougher than s18! S18 had standard questions with little trickery, but s17 had a few new questions with different styles. Thresholds are expected to be 40-42 for S18.

 

[ughkno]

I did. and I think we should

In the graph, did the x-axis not include 10^3?
Oh god, I messed up :/

 

[Ahmed kooheji]

the distance is constant. i forgot to write the F= mg technique but i did write the relationship correctly. i also wrote about letting the sphere charge and reading on top pan balance to get constant to make the final reading. told to measure the diameter of spheres properly so that the distance r is accurate and proper. anything else?

What did you use to measure diameter ?? I used vernier caliper .. how was Q2 did u finish on time ?

 

[anastasia grey113]

In the graph, did the x-axis not include 10^3?
Oh god, I messed up :/

well thats ok
youll still get an ecf

 

[ThePacifics]

What did you use to measure diameter ?? I used vernier caliper .. how was Q2 did u finish on time ?

yeh the whole paper i kind of couldnt complete on time. Q.2 was also on the tougher side. i drew the line of best fit and stuff. what was your gradient .
also i took the y intercept from the graph is it alright.

 

[Tauqir_hamed]

S17 was surely tougher than s18! S18 had standard questions with little trickery, but s17 had a few new questions with different styles. Thresholds are expected to be 40-42 for S18.

I hope it won't be like 43,44. How did the people in your school feel? Are you taking A2 as well ?

 

[Kanekii]

It is kinetic energy.

Oh but shouldnt other particles also gain K. E and it didnt lose mass though since mass number was constant?

 

[xoxoxoxo123276]

What was the resistance of the wire in p2??

 

[Ahmed kooheji]

yeh the whole paper i kind of couldnt complete on time. Q.2 was also on the tougher side. i drew the line of best fit and stuff. what was your gradient .
also i took the y intercept from the graph is it alright.[/QUOTE

yeh the whole paper i kind of couldnt complete on time. Q.2 was also on the tougher side. i drew the line of best fit and stuff. what was your gradient .
also i took the y intercept from the graph is it alright.

My gradient was 5.67 x10^-13 ... about the y intercept u had to use the formula (y=mx+c) cuz it’s always written in ms and examiner report

 

[ThePacifics]

its also written in a few they allow from graph like an ecf.

 

[Ahmed kooheji]

its also written in a few they allow from graph like an ecf.

Ok then it’ll be fine for u .. what did u get for % uncertainty in N ? I got 67% the calculation was complicated

 

[ThePacifics]

Ok then it’ll be fine for u .. what did u get for % uncertainty in N ? I got 67% the calculation was complicated

i couldnt do that one. i only wrote the formula and it was only 1 mark.

 

[ThePacifics]

do u think the gt would be low this year for paper 51 our lot didnt find it easy either sigh

Ok then it’ll be fine for u .. what did u get for % uncertainty in N ? I got 67% the calculation was complicated

 

[Ahmed kooheji]

i couldnt do that one. i only wrote the formula and it was only 1 mark.

Yeah that’s smart to sacrifice this 1 mark for 5-10 extra minutes .. I couldn’t recheck my planning question.. but I think I included everything I can think of ..