Maths & Physics Help

[astarmathsandphysics]

Post your IGCSE questions here to get the answers back asap from someone with 3 maths/physics degrees.

[jinxnumba1]

do u have notes on electronics and radioactivity??

[astarmathsandphysics]

Does this help?

[jinxnumba1]

it does thanks...but if u dont mind do have notes with more detail on electronics, transformers and static electricity..
if u do thanks... 

[fatmajalal]

plz if u hve some detailed info on how a.c and d.c generator works?? thanks

[astarmathsandphysics]

http://www.physclips.unsw.edu.au/jw/electricmotors.html

Try this link. It has videos too.

[xara]

http://www.physclips.unsw.edu.au/jw/electricmotors.html

Try this link. It has videos too.

I have prepared for my physics on my own from Stephen Pople's 'Complete Physics for IGCSE', m writing my Paper 6 (alternative to practical) on the following 30th. Do i need to know any more practicals than there are in the book? =O

[astarmathsandphysics]

I will look today. I have to go out now and will be back in 5 hours.

[astarmathsandphysics]

I shouldn't thinks so but there are gcse courseworks on www.freeexampapers.com and www.courseworkbank.info that might help you.

[sonali]

plzzzzz need help fr maths
ammm i m not at all good at probability
can someone solve d sum fr me
Q . a goalkeeper expects to save one penalty out of every three . calculate d probability tht he :
a) saves one penalty out of d next three
b. fails to save ne of d next three penalties
c. saves two out of d next three penalties
plzzzz give detailed expl fr hw to get this ans
n ya needed notes on or i shld say say some good examples based on d topic THE ANGLE BETWEEN D LINE N D PLANE
PLZZZZ ITS URGENT
N
THX 

[astarmathsandphysics]

a)He can save, miss, mis
or miss, save, misss
or miss, miss, save
The probability of each is 1/3x2/3x2/3=6/27
Therefore total=3x6/27=18/27=2/3

b)If he fails to save one, then he misses them all ie 2/3x2/3x2/3=8/27

c) he can save, save, miss
or save, miss, save
or miss, save, save
the probability of each is 2/3x1/3x1/3=2/27
therefore total is 3x2/27=6/27=2/9

As for the line and plane thing, if you post questions here I will anser them, If you really want me to summarize the topic tell me first, is this a level or igcse. I think you might be in the wrong board.

[sonali]

a)He can save, miss, mis
or miss, save, misss
or miss, miss, save
The probability of each is 1/3x2/3x2/3=6/27
Therefore total=3x6/27=18/27=2/3

b)If he fails to save one, then he misses them all ie 2/3x2/3x2/3=8/27

c) he can save, save, miss
or save, miss, save
or miss, save, save
the probability of each is 2/3x1/3x1/3=2/27
therefore total is 3x2/27=6/27=2/9

As for the line and plane thing, if you post questions here I will anser them, If you really want me to summarize the topic tell me first, is this a level or igcse. I think you might be in the wrong board.

hello astarmathsandphysics
thx fr solving d sum
bt ya i still continue to have issues wth this sum as d ans of 1a and 1b does not tally
according to which book i hv taken this frm it says d ans to 1a is 12/27 n to 1b is 26/27
d last ans is correct
n ya as fr d topic d line and between d plane i wldnt mind if u can summarize it
n ya it is fr d igcse level wht i want
thx

[astarmathsandphysics]

u are right about 1a i said 2x2 is 4. Check it. Check q1b again though

[astarmathsandphysics]

am sure 1b is 'probability that he fails to save at least one'

[astarmathsandphysics]

i mean he fails to save them all