Biology; Chemistry; Physics: Post your doubts here!

[khizer shahab]

answer is D

What are the rules? Just want to make sure you didnt make a guess.

okaay , pleese state the reasons for not being the answer C and as well for the answer D

 

[Mayedah]

i would go with option C my guess

I know it would be D because in the parallel combination of spring L is supported by 2 springs which means half acts on two springs
L= 2x

Since in seties combination of force L acts on each spring androduce an extension of 2x so it will be 4x which is
Pheww

 

[khizer shahab]

I know it would be D because in the parallel combination of spring L is supported by 2 springs which means half acts on two springs
L= 2x

Since in seties combination of force L acts on each spring androduce an extension of 2x so it will be 4x which is
Pheww

truly LOL ......... I posted option C for asd 's query not yours !!!

by the way i knew the answer is D for urs quey but fallen replied erlier!!!

 

[malay]

I know it would be D because in the parallel combination of spring L is supported by 2 springs which means half acts on two springs
L= 2x

Since in seties combination of force L acts on each spring androduce an extension of 2x so it will be 4x which is
Pheww

we r discussin a different question

 

[asd]

here is the detailed explanation...for those who made a guess

HAHAHAA... DAT AWKWARD MOMENT WHEN HATERS OF PHYSICS R ABLE TO GIVE RIGHT ANSWER

-_- Silly me, shlda asked the explanation before telling the right answer...
Well the reason is, in a circular motion speed is constant (fact) but the direction changes! So acceleration can not be zero. It changes because velocity changes (cycle changes direction as it turns). The resultant force must be acting towards the center because this keeps the cycle moving with constant speed in a circle. And according to Newton's second Law, Acceleration acts in the direction of the force . So both must act towards the center.

 

[khizer shahab]

okay now a question from me of 30.0024 marks

Q) When a thermometer is placed into hot water, why the reading drops first then increases.

is there anyone ...?

 

[Fallen316]

okay now a question from me of 30.0024 marks

Q) When a thermometer is placed into hot water, why the reading drops first then increases.

is there anyone ...?

first, only the glass expands, not the mercury ??

 

[khizer shahab]

IS THERE ANY MNEMONIC OF LEARNING ELECTROMAGNETIC SPECTRUM

it is just fleeing over mind !!

 

[convent2012]

find the total heat gained by 200g metal rod if its temp is raised from 35degreeC to 7odegreeC . c for metal is 3.56multiply 10 power6 J/kg K-1 ?
ANYONE PLZ ! I WANA CHECK MY ANSWER !

 

[khizer shahab]

first, only the glass expands, not the mercury ??

fabulous dude A* pakka as haha101 anticipated !!!

 

[malay]

IS THERE ANY MNEMONIC OF LEARNING ELECTROMAGNETIC SPECTRUM

it is just fleeing over mind !!

yeah its kin o creepy buh still helpful
RABITS MATE IN VERY UNUSAUALLY EXPENSIVE GARDENS

radio_micrwaves_infrared_ultraviolet_X ray_gamma

 

[Dukeofwin]

the answer's D
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_w09_ms_1.pdf

Isnt the answer D?

also can someone explain the MCQ 9?

My Bad, second time replying to an MCQ and getting it wrong. What disaster!
Next time as per rule of thumb refer to ms before even thinking to press the reply button.

*Knew it i was worse in MCQ's for all subs!

 

[Fallen316]

find the total heat gained by 200g metal rod if its temp is raised from 35degreeC to 7odegreeC . c for metal is 3.56multiply 10 power6 J/kg K-1 ?
ANYONE PLZ ! I WANA CHECK MY ANSWER !

mine is 2.4*10^7 . Urs ?

 

[Dukeofwin]

mine is 2.4*10^7 . Urs ?

Spot on! E=mc (multiplied by) change in temperature!
with conversion of Gram to Kilogram

 

[Fallen316]

Spot on! E=mc (multiplied by) change in temperature!
with conversion of Gram to Kilogram

i did the same

 

[Dukeofwin]

yeah its kin o creepy buh still helpful
RABITS MATE IN VERY UNUSAUALLY EXPENSIVE GARDENS

radio_micrwaves_infrared_ultraviolet_X ray_gamma

LOL!
Nice one! But for most this spectrum is quite easy to memorize when compared to learning the reactivity series!

 

[ayeshaK]

13.A
since pressure is inversly proprtional to volume, P*V = k ( constant value )
now you multiply , in each option , the pressure with the volume
b,c,d's constant is 4800 , while a's constant is 4320.
30.B
in series , the current remains the same while in parallel the current divides.

Ahan thnku

 

[Aneeq]

find the total heat gained by 200g metal rod if its temp is raised from 35degreeC to 7odegreeC . c for metal is 3.56multiply 10 power6 J/kg K-1 ?
ANYONE PLZ ! I WANA CHECK MY ANSWER !

i guess you also have to change DEGREE C INTO K! as in specific latent heat!

 

[Fallen316]

i guess you also have to change DEGREE C INTO K! as in specific latent heat!

oh yes, how did i forget that

 

[Aneeq]

yeah its kin o creepy buh still helpful
RABITS MATE IN VERY UNUSAUALLY EXPENSIVE GARDENS

radio_micrwaves_infrared_ultraviolet_X ray_gamma

How do people imagine such stuff?
but still thanks alot!