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Author Topic: Maths & Physics Help  (Read 59921 times)

Offline godfather93

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Re: Maths & Physics Help
« Reply #330 on: May 10, 2009, 10:46:08 pm »
i don't understand either. ???
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Offline astarmathsandphysics

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Re: Maths & Physics Help
« Reply #331 on: May 10, 2009, 10:56:10 pm »
120-40=80 and 50 mins=5/6 0f 60 mins =1 hour
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Offline godfather93

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Re: Maths & Physics Help
« Reply #332 on: May 10, 2009, 10:59:11 pm »
but why are our answers so far apart. I just used a smaller part of the line to calculate the gradient, still, it should be around the same answer!
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #333 on: May 11, 2009, 07:04:04 am »
i know this
:P

u have to find the speed in km/h
while in graph, the time is in minutes
so u ahve to convert it into hours
to convert 50 mins into hours

50/60    =    5/6


speed = dist/time
         =80/(5/6)
         =80 x 6/5
         =480/5
         =96km/h
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Offline Ukhti-R

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Re: Maths & Physics Help
« Reply #334 on: May 11, 2009, 07:34:12 am »
Im stuck guyz
I cant do Q20a,c i) and ii)
May june 2008 P2
anyone ..?
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Offline astarmathsandphysics

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Re: Maths & Physics Help
« Reply #335 on: May 11, 2009, 07:40:19 am »
Quote from: Roxy on May 11, 2009, 07:34:12 am
Im stuck guyz
I cant do Q20a,c i) and ii)
May june 2008 P2
anyone ..?

ci)Times the area by (103)2= 106


ii)Divide your answer toci) by 1.5
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Offline Ukhti-R

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Re: Maths & Physics Help
« Reply #336 on: May 11, 2009, 07:45:01 am »
but why to the power of 6 and not 
cuz, its mcube to mm cube
soisnt that 100x100x100x10x10x10 ?
and for a) I did (95/360x piex160x160)-(95/360xpiex100x100)
but Im getting it rong...
 :(
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Offline Ukhti-R

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Re: Maths & Physics Help
« Reply #337 on: May 11, 2009, 08:04:27 am »
astar?  u there ?
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"...And whosoever fears Allah and keeps his duty to Him, He will make a a way for him to get out (from every difficulty). And He will provide him from (sources) he never could imagine. And whosoever puts his trust in Allah, then He will suffice him." [65: 2-3]

Offline astarmathsandphysics

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Re: Maths & Physics Help
« Reply #338 on: May 11, 2009, 08:09:14 am »
Quote from: Roxy on May 11, 2009, 08:04:27 am
astar?  u there ?
1m3=(1000mm)3=1000000000mm3

Yes you are right
« Last Edit: May 11, 2009, 08:15:48 am by astarmathsandphysics »
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Offline Ukhti-R

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Re: Maths & Physics Help
« Reply #339 on: May 11, 2009, 09:08:11 am »
pheww..! lol. okay and for section a, i my method correct
because Im getting a different answer than the mark scheme
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"...And whosoever fears Allah and keeps his duty to Him, He will make a a way for him to get out (from every difficulty). And He will provide him from (sources) he never could imagine. And whosoever puts his trust in Allah, then He will suffice him." [65: 2-3]

Offline tmisterr

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Re: Maths & Physics Help
« Reply #340 on: May 11, 2009, 09:11:25 am »
Quote from: astarmathsandphysics on October 06, 2008, 11:05:57 am
Post your IGCSE questions here to get the answers back asap from someone with 3 maths/physics degrees.
hey astar i need help with question 2(a), the circuit drawing. The paper is OCT/NOV 2005 physics paper 6
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Offline Ukhti-R

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Re: Maths & Physics Help
« Reply #341 on: May 11, 2009, 09:12:38 am »
I have another question for you astar, Im realli sorry, but Im so rubbish at maths and its the day afta 2morrow
so.. how do you do Q10 a P2 1998 ??
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Offline Kim

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Re: Maths & Physics Help
« Reply #342 on: May 11, 2009, 09:22:09 am »
ok i m kind of worried i need an answer to an old paper6 physics question year 1999
A drinking straw was sealed at one end with candle wax.tyhe straw was made to float upright in water by putting a small amount of ballast into the straw.The height of the top of the straw was determined  uysing a set square attached to the meter rule..The height was h

a-explain why the set square is used when taking the reading for h

b-before taking the readings for h, one of the students pushed the straw down a little.the straw then moved up and down befor coming to rest.suggest a reason why this was done.

c-the straw floats in the water so dat its top is as high as possible.For this reason the container was full of water.Suggest what would happen if the container was not quite full i.e it was three quarters full
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Offline astarmathsandphysics

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Re: Maths & Physics Help
« Reply #343 on: May 11, 2009, 09:26:14 am »
Quote from: kim on May 11, 2009, 09:22:09 am
ok i m kind of worried i need an answer to an old paper6 physics question year 1999
A drinking straw was sealed at one end with candle wax.tyhe straw was made to float upright in water by putting a small amount of ballast into the straw.The height of the top of the straw was determined  uysing a set square attached to the meter rule..The height was h

a-explain why the set square is used when taking the reading for h

b-before taking the readings for h, one of the students pushed the straw down a little.the straw then moved up and down befor coming to rest.suggest a reason why this was done.

c-the straw floats in the water so dat its top is as high as possible.For this reason the container was full of water.Suggest what would happen if the container was not quite full i.e it was three quarters full
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
a)to make the height reading accurate
b) to reduce the effect of surface tension
c)It  might touch the bottom and tilt over
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Offline Kim

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Re: Maths & Physics Help
« Reply #344 on: May 11, 2009, 09:36:36 am »
THANK U SO MUCH NOW I  NEED ANOTHER ANSWER SORRY FOR BOTHERING U
rays of light are reflected from the poutside of a beaker that contained siome water coloured with blue ink
 a- why is it an advantage to fill the the beaker with coloured water when viewing the lamp by a ray reflected from the outside surface of the beaker?

in some questions they tell that three lamps are connected in parallel and a voltmeter connected to record the potential difference across all three lamps
where do i put the voltmeter?their is also a variable resistor to vary the brightness of all the 3 lamps
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After all is said and done, more is said than done.

By the time a man realizes that maybe his father was right, he usually has a son who thinks he’s wrong.

The early bird may get the worm, but the second mouse gets the cheese.
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