# Physics, Chemistry and Biology: Post your doubts here!

#### Dalia Omar

Can anyone give me source where I can find sample and model answers to Planning Questions (last Question) to paper 6 (IGCSE) . I found a very useful video in this link below.
Can anyone suggest anything more.

#### HLOMPHO PRINCESS

I need help with something in physics I hope I can still post my doubt can someone please explain sensitivity,range,speed of response and linearity what affects them in the LIG thermometer

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#### HLOMPHO PRINCESS

omw i bet this is so late but i just saw this idk if it will help for some reason the workdone=(f*d)+k.e which means f*d + 1/2mv^2 which is 10000+2500..so crazy

#### kiran kk

Hello! I am having problems in the Unit of Electromagnetism in Physics, I have doubts in b), bii), biii) and biv)
I have done A and C, can anyone help me

#### Mr.Physics

Hello! I am having problems in the Unit of Electromagnetism in Physics, I have doubts in b), bii), biii) and biv)
I have done A and C, can anyone help me
Can anyone mention the answers?View attachment 65039
if XY is moved horizontally in any direction, no magnetic field lines will be cut therefore no change would be observed on the pointer.
However, if XY is moved up and down repeatedly at right angles to the magnetic field, the magnetic field lines are cut and current is produced because the magnetic lines of force are applying a force on the free electrons in the conductor and causing them to move. So the answers will be:

(i) no change
(ii) no change
(iii) no change
(iv) pointer flickers between A and B

#### kiran kk

Electromagnetism Unit Doubt!

Can someone mention the answer and why?

I always find it difficult to solve physics atp... Could you provide me some tips fr help?

#### ❤Nouran❤

what is the difference between combustion and burning?.
And which one is an exothermic reaction?.

#### ❤Nouran❤

Electromagnetism Unit Doubt!

Can someone mention the answer and why?

View attachment 65042
(i) Fig.10.3 the coil is perpendicular to the magnetic field , so the e.m.f is at its maximum
(ii) Fig.10.1 as the coil is parallel to the magnetic field, thus no e.m.f is produced

#### ❤Nouran❤

Is neutralisation endothermic or exothermic?

exothermic

#### nitin5237

Q: A cyclist travels along a horizontal track at constant speed. The work done by the cyclist is equal to :

can I pls get the answer

#### kiran kk

How to solve 3B??

#### ❤Nouran❤

I am not really sure but I guess we should add their masses (as they will be joined together) and then divide 0.16 (as momentum before the collision is equal to the momentum after the collision) by 0.8 (the sum of their masses) to get the speed(velocity) to be 0.2m/s

#### Agent 47

Hello everyone, I need some help, can anyone please give me notes for Physics, Chemistry and Biology, thanks

#### ❤Nouran❤

View attachment 65163
View attachment 65164
View attachment 65165

mole=volume x concentration
volume=mole x 24

4(c)(i) 0.002 (mol); 0.1 x 0.02dm3 (e.g 20cm3/1000)
4(c)(ii) 0.001 (mol); 0.002/2 (becuz its 2H2O2:1O2 SO 2:1)
4(c)(iii) 0.024 (dm3); 0.001 x 24
4(c)(iv) no change/ no effect; (as catalysts don't affect equilibrium and thus the volume of the reactants-it just speeds up the reaction)
4(c)(v) 0.048 (dm3 ); 0.024 x 2 (as concentration is doubled )-e.g 0.1mol/dm3 x 2 = 0.2 mol/dm3

Hope it helps
Good luck!