Biology; Chemistry; Physics: Post your doubts here!

[***amd***]

B?

C .-.

 

[***amd***]

Q13 is flawed to me. Answer on that back is C. Er said this: "This question deals with a diver who is slowing down as he moves downwards through water. The correct answer C was chosen by a small number of candidates. Rather more candidates chose A and B which suggest that at some point, the kinetic energy of the diver is increasing."

nahi aya samajh :/

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_12.pdf
Q13 :/

Afnan Hafiz chanda mama help me.

 

[Dark Destination]

Centripetal force? ._.

 

[Afnan Hafiz]

nahi aya samajh :/

Afnan Hafiz chanda mama help me.

You want the answer or explanation?

 

[***amd***]

You want the answer or explanation?

explanation answers are available in marking schemes

Centripetal force? ._.

for towards center
and
centrifugal = away from center

 

[Dark Destination]

What is this Centripetal force? Which chapter?

Open the syllabus, and look at all the points. You'll find many things you haven't studied.

 

[Dark Destination]

5 hours before the paper. FML.

I know. :/

 

[Laibaaa]

Is there a difference btween the working of Magnetic Relay and Reed Relay?

 

[Afnan Hafiz]

The guy dives with kinetic energy (moving) and as he becomes still (reaches the bottom of the pool), he uses gravitational potential energy. Gravitational potential energy is static energy, i think.. Ok, so when the kinetc energy and G.P energy adds up, they combine to form thermal energy. If you start running downhill, you'll be using kinetic energy, as you reach the bottom of the hill, you use G.p energy, as you come to a stop, don't you feel warm? Thats the thermal energy... I know my explanation is lousy, but it is the best i could offer.. Chapter almost bhuul gaya hai yar!

 

[Laibaaa]

5 hours before the paper. FML.

Its okay, we'll utilize these 5 hours insha'Allah.

 

[***amd***]

5 hours before the paper. FML.

when you swirl a stone tied to a string. the force directed towards the center of movement (your hand) by the string is "centripital force".

 

[Dark Destination]

Its okay, we'll utilize these 5 hours insha'Allah.

You won't sleep?

 

[Afnan Hafiz]

May Allah make today's paper easy for all of you and make you successful in whatever aim you all are following! Ameen

 

[***amd***]

The guy dives with kinetic energy (moving) and as he becomes still (reaches the bottom of the pool), he uses gravitational potential energy. Gravitational potential energy is static energy, i think.. Ok, so when the kinetc energy and G.P energy adds up, they combine to form thermal energy. If you start running downhill, you'll be using kinetic energy, as you reach the bottom of the hill, you use G.p energy, as you come to a stop, don't you feel warm? Thats the thermal energy... I know my explanation is lousy, but it is the best i could offer.. Chapter almost bhuul gaya hai yar!

but why cant we say KE chnges to GPE + thermal?

 

[***amd***]

Is there a difference btween the working of Magnetic Relay and Reed Relay?

what is relay?

 

[Laibaaa]

You won't sleep?

I am so not gonna sleep. My Physics is a little weak so.

 

[Laibaaa]

what is relay?

Its actually very easy. We just have to learn how they work.
Open the book and look for it.
Matters Pg 419 and also in Federal.

 

[Afnan Hafiz]

but why cant we say KE chnges to GPE + thermal?

Because, thermal energy comes only when there has been k.e and g.p... With only k.e, how can you expect g.p.e and thermal energy? You go on running and don't stop, how will you get thermal energy? For getting it, you must come to a stop.... GPE.

 

[Laibaaa]

https://sites.google.com/site/urban...app/pages/subPages?path=/using-word-documents

This is very helpful too if someone needs it. Easy to understand.

 

[***amd***]

Because, thermal energy comes only when there has been k.e and g.p... With only k.e, how can you expect g.p.e and thermal energy? You go on running and don't stop, how will you get thermal energy? For getting it, you must come to a stop.... GPE.

thora thora pallay par gya shukiya
Alhamdulillah