Physics: Post your doubts here!

[Minsa Fatima]

can anyone please explain this?

 

[GarryTheGhost]

can anyone please explain this?View attachment 62515

ans????

 

[Minsa Fatima]

ans????

B

 

[Minsa Fatima]

And this one too..

 

[GarryTheGhost]

can anyone please explain this?View attachment 62515

we first need to find the voltage in the external resistance. so using v=ir
hence v=5.5v. since the all of the components are parallel to each other they all have an terminal potential difference of 5.5v
current going into the junction= output of junction.
so the current going into the internal resistance is 0.25A. 0.5/2 as both components have the same p.d and internal resistance they both have the same current
simply then use the formual
terminal p.d=Emf-Ir
5.5=6-0.25r
hence r is 2 ohms

 

[Minsa Fatima]

no ans is B

 

[Minsa Fatima]

we first need to find the voltage in the external resistance. so using v=ir
hence v=5.5v. since the all of the components are parallel to each other they all have an terminal potential difference of 5.5v
current going into the junction= output of junction.
so the current going into the internal resistance is 0.25A. 0.5/2 as both components have the same p.d and internal resistance they both have the same current
simply then use the formual
terminal p.d=Emf-Ir
5.5=6-0.25r
hence r is 2 ohms

Thanks

 

[Shimmery woods]

And this one too..View attachment 62516

when two objects collide elastically then relatice speed of approach = relative speed of seperation
• Same direction = subtract speed
•Opposite direction= add speed
answer=A

 

[Minsa Fatima]

when two objects collide elastically then relatice speed of approach = relative speed of seperation
• Same direction = subtract speed
•Opposite direction= add speed
answer=A

thankyou

 

[GarryTheGhost]

And this one too..View attachment 62516

when two objects collide elastically then relatice speed of approach = relative speed of seperation
• Same direction = subtract speed
•Opposite direction= add speed
answer=A

lol beat me to it

 

[furuta]

Help with questions 15 and 29 please <3
http://papers.gceguide.com/A Levels/Physics (9702)/9702_m16_qp_12.pdf

 

[Minsa Fatima]

 

[Minsa Fatima]

Help with questions 15 and 29 please <3
http://papers.gceguide.com/A Levels/Physics (9702)/9702_m16_qp_12.pdf

15. mass=weight/gravity
600000/9.81=61162
KE=1/2 *61162*40*40
KE=12MV
Answer=C

29. W=QV
Fd=QV
F=1.6*10-19 *200/0.005
=6.4*10-15

 

[student4563543]

View attachment 62517

is B the answer?

 

[Minsa Fatima]

is B the answer?

Its C

 

[amina1300]

mj2016 p11
Q 32 Ans is c Q 5 Ans is D and Q 14? ans is b
http://papers.gceguide.com/A Levels/Physics (9702)/9702_s16_qp_11.pdf

 

[GarryTheGhost]

View attachment 62517

lol CIE really tries to throw us under the bus.
2100*25=5.3kw
cause its asking about thermal energy so i guess you get that from the drag and friction

 

[amina1300]

Its C

Energy dissipatedis due to work done against motion f*v...2100*25= ans c

 

[amina1300]

lol CIE really tries to throw us under the bus.
2100*25=5.3kw
cause its asking about thermal energy so i guess you get that from the drag and friction

wow ur fast. Can u solve my Q? ^

 

[amina1300]

paper 11