Biology; Chemistry; Physics: Post your doubts here!

[asadalam]

i am moriarty and also sherlock.....u see every good old fashioned hero has a villian in them.....

You either die a hero or live long enough to see yourself become a villain

 

[Awesome12]

View attachment 39655

Thank you for the explanation. Finally makes some sense now

 

[princess sofia]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_32.pdfhn
Q1. part b (ii)
why would it increase whn the skier is decelerating

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_32.pdfhn
Q1. part b (ii)
why would it increase whn the skier is decelerating

Link the paper again, can't open it.

 

[princess sofia]

Link the paper again, can't open it.

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_32.pdf

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_32.pdf

Yeah, so the acceleration is decreasing and the speed is increasing. See the initial acceleration is 10ms^-2 which means that the diver is increasing his speed by 10m/s every second. Then air resistance acts in it and his acceleration decreases to say 5ms^-2 but still he's increasing his speed by 5m/s every second. Therefore whenever an object has positive acceleration which decreases, the speed increases.

 

[FLRNAB]

Yeah, so the acceleration is decreasing and the speed is increasing. See the initial acceleration is 10ms^-2 which means that the diver is increasing his speed by 10m/s every second. Then air resistance acts in it and his acceleration decreases to say 5ms^-2 but still he's increasing his speed by 5m/s every second. Therefore whenever an object has positive acceleration which decreases, the speed increases.

Another possible explanation?
Speed is increasing as Potential Energy is being converted to Kinetic Energy.
Accelaration is decreasing as it can be seen from the table/graph.

 

[princess sofia]

Yeah, so the acceleration is decreasing and the speed is increasing. See the initial acceleration is 10ms^-2 which means that the diver is increasing his speed by 10m/s every second. Then air resistance acts in it and his acceleration decreases to say 5ms^-2 but still he's increasing his speed by 5m/s every second. Therefore whenever an object has positive acceleration which decreases, the speed increases.

Thnx alot

 

[Haitam Banoori]

My question remains unanswered! -_-

 

[Haitam Banoori]

IT WAS;
Q- Where could I find good sources (notes) for electronics (introductory electronics, electronic systems) that relate to our syllabus?
And if someone can, what are; 1- REED RELAYS, 2- BISTABLE CIRCUITs, 3- ASTABLE CIRCUITs?

 

[Haitam Banoori]

Lets see who the real Sherlock is?

 

[Faizan Muhammmad]

We all skip that part
so nobody knows

 

[Haitam Banoori]

We all skip that part
so nobody knows

Well that explains a lot! Thanks though.

 

[umme laila]

Does anyone have Imran Merchant's O'levels Biology and Chemistry Guess Papers???

 

[Adeena Shamshir]

Does anyone have Imran Merchant's O'levels Biology and Chemistry Guess Papers???

guess papers r useless...attempting past papers is a better option

 

[funky brat]

Where do you use the frequency= 1/f formula? Can somebody elaborate with an example?

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w10_qp_12.pdf
Explain the 4th MCQ please. How exactly do you get to know?

 

[exploded diper]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w10_qp_12.pdf
Explain the 4th MCQ please. How exactly do you get to know?

ans is c....zero of vernier scale is 0.1 cm ahead of the main scale...and the lines r aligned at 4.... so we multiply 4 * 0.01 so ..they r at 0.04 cm....so the ans is 0.14cm

 

[Faizan Muhammmad]

Hey people in chemistry there are these inverted beaker over porous pot connected to water thingies
what is the principle behind that

<btw my 1000th post on xpc

 

[Faizan Muhammmad]

Where do you use the frequency= 1/f formula? Can somebody elaborate with an example?

you have got time period of wave, x seconds
the question asks the frequency, frequency is number of waves in one second
so we will divide 1 by x to get number of waves in a second which is frequency