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Physics, Chemistry and Biology: Post your doubts here!

ZainH

ZainH

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kainat husain said:
please someone help
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf
q8 y is it A?
q9 y is it B?
q16 how to find out tht its C? :/
q31 y d? y not b?
q38 y b????????? how to calculate :/
q40 wht do they mean :/
please some one help!
Click to expand...

Cant help you on all but for the ones I can I will..

For Q16, it says when placed in steam the mercury rises to 22cm meaning that's 100C, and it says it rises to 2cm when placed in pure melting ice meaning thats 0C.
In between 22cm and 2cm there are 10 divisions. 100/10 = 10 . So each divison represents 10C. In the diagram the mercury level is at 8 and the starting point is 2. There are 3 divisions between these 2 numbers meaning 3x10 = 30C

Q31. If lamp B breaks, lamp C will still work. If lamp D breaks none of the lamps will work because the current has to eventually pass through all of them and reach D.

Q38. It says which source has a half life of 2 days. They have given us a table with 3 days. So whichever source is halved by wednesday has a half life of 2 days. The only one which halves by wednesday is B , it goes from 200 to 100.

Q40. There just saying which of those elements have the same proton number? Proton number is written at the bottom right of an element and since all 3 of those "nucleotides" or elements have the number 1 the answer is C.

Hope this helped x)
 
GetSomeLife

GetSomeLife

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kainat husain said:
please someone help
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf
q8 y is it A?
q9 y is it B?
q16 how to find out tht its C? :/
q31 y d? y not b?
q38 y b????????? how to calculate :/
q40 wht do they mean :/
please some one help!
Click to expand...
Q8: The stability of an object depends on the height of it's centre of mass above the ground and the width of it's base. A (the triangle) has the lowest centre of mass and a base equal to the others :)

Q9: I think you get to that conclusion because none of the other methods require STEAM!

Q16:
2o cm = 100 Degrees
1 cm = 5 degree
(8-2) cm = 30 degrees

I think the rest have been answered :)
 
ZainH

ZainH

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GetSomeLife said:
Q8: The stability of an object depends on the height of it's centre of mass above the ground and the width of it's base. A (the triangle) has the lowest centre of mass and a base equal to the others :)

Q9: I think you get to that conclusion because none of the other methods require STEAM!

Q16:
2o cm = 100 Degrees
1 cm = 5 degree
(8-2) cm = 30 degrees

I think the rest have been answered :)
Click to expand...

20cm= 100 Degrees?
1cm= 5 degrees?

How :s?
 
ZainH

ZainH

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GetSomeLife said:
Steam = 22 cm
Ice = 2 cm

Difference in their temperatures = 100
Difference on scale = 20 cm

20 cm is equivalent to 100 degrees
Simplify :p
Click to expand...

Wouldn't it be 22cm = 100 degrees and 2cm= 0 degrees
And since the thermometers divisions are 2 each there's technically 10 divisions between 22 and 2.
Each division would represent 10 degrees, since 2 is 0 degrees you count the number of divisions from 2 till 8, which is 3. 3x10= 30 degrees.

Thats how I did it x)
 
GetSomeLife

GetSomeLife

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ZainH said:
Wouldn't it be 22cm = 100 degrees and 2cm= 0 degrees
And since the thermometers divisions are 2 each there's technically 10 divisions between 22 and 2.
Each division would represent 10 degrees, since 2 is 0 degrees you count the number of divisions from 2 till 8, which is 3. 3x10= 30 degrees.

Thats how I did it x)
Click to expand...
:D It's the same thing! I just figured the 'division' in a different manner ;)
 
GetSomeLife

GetSomeLife

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My problem:

How the heck do you compare frequency, pitch, amplitude, loudness and wavelength with each other? -.-
 
I

igcsedude_Jor

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can someboby explain to me the following questions: q 11, 31 and 34 from nov2011 varient1 paper1
thank u
 

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ZainH

ZainH

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GetSomeLife said:
My problem:

How the heck do you compare frequency, pitch, amplitude, loudness and wavelength with each other? -.-
Click to expand...

The larger the amplitude the louder the sound. The higher the frequency the higher the pitch. Vice-versa..
Not sure what wavelength has to do with any of that.
 
kainat husain

kainat husain

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ZainH said:
Cant help you on all but for the ones I can I will..

For Q16, it says when placed in steam the mercury rises to 22cm meaning that's 100C, and it says it rises to 2cm when placed in pure melting ice meaning thats 0C.
In between 22cm and 2cm there are 10 divisions. 100/10 = 10 . So each divison represents 10C. In the diagram the mercury level is at 8 and the starting point is 2. There are 3 divisions between these 2 numbers meaning 3x10 = 30C

Q31. If lamp B breaks, lamp C will still work. If lamp D breaks none of the lamps will work because the current has to eventually pass through all of them and reach D.

Q38. It says which source has a half life of 2 days. They have given us a table with 3 days. So whichever source is halved by wednesday has a half life of 2 days. The only one which halves by wednesday is B , it goes from 200 to 100.

Q40. There just saying which of those elements have the same proton number? Proton number is written at the bottom right of an element and since all 3 of those "nucleotides" or elements have the number 1 the answer is C.

Hope this helped x)
Click to expand...
thanksss a lot! but 1 doubt q38 even A tuesday its 50 and wednesday its 25 isnt it halved?
 
kainat husain

kainat husain

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GetSomeLife said:
Q8: The stability of an object depends on the height of it's centre of mass above the ground and the width of it's base. A (the triangle) has the lowest centre of mass and a base equal to the others :)

Q9: I think you get to that conclusion because none of the other methods require STEAM!

Q16:
2o cm = 100 Degrees
1 cm = 5 degree
(8-2) cm = 30 degrees

I think the rest have been answered :)
Click to expand...
thankssss a lot :D
 
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