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#1 Re: Help Me ! » circular motion » 2008-04-28 09:45:45
Thank you very much i knew it was something simple i just couldn't find a way of writing it 
#2 Help Me ! » circular motion » 2008-04-28 08:54:01
- ROBBYM
- Replies: 3
A bead lies on a smooth table connected to a light string through a hole in the table to a 2nd bead of mass M. The 1st bead moves in a circle of radius r while the 2nd bead remains stationary. show the speed of the 1st bead is
#3 Re: Help Me ! » Mechanics » 2008-04-28 06:31:01
hey i put the extra negative sign in there because its in the negative Z direction so we have the vector -K
I've tried to find the second part of the equation
however i realized the dz/dt is equal to velocity not speed so i'm still not sure how to get the
#4 Re: Help Me ! » continuous » 2008-04-27 19:54:22
So if i re-write it like this then
isn't this continuous if x does not equal 4
but if x equals 4 then f(x)=8 which is not continuous for all real values of x
therefore the function is not continuous????
#5 Help Me ! » continuous » 2008-04-27 19:25:18
- ROBBYM
- Replies: 5
show the function f:R->R
when x does not equal 48 when x equals 4
is continuous on R
#6 Help Me ! » The converse of wilson's theorem » 2008-04-27 08:44:44
- ROBBYM
- Replies: 5
so i've got a question which i'm stuck on
prove
p divides (p-1)!+1
the converse of wilsons theorem
now i've googled this but all i can find is history about this theorem but no proof does anyone know it?? please help
#7 Help Me ! » calculus » 2008-04-25 21:11:49
- ROBBYM
- Replies: 2
S is a sphere
i'm suppose to find the unit normal to S but i'm not sure how this is done does anyne know a formula??? please help me
#8 Help Me ! » algebra » 2008-04-25 08:05:53
- ROBBYM
- Replies: 4
a and b are elements of group G. show that ab and ba have the same order. to complete this question iam suppose to find a reationship between (ab)^n and (ba)^n using the general associative law
I'm a little confused how to do this question as i would have used the comutative law which must be wrong because the question is worth a lot of marks please help me i have an exam on algebra soon and its quite worrying i can't answer this question 
#9 Re: Help Me ! » index laws » 2008-04-25 07:32:41
so you can prove the base step is true for n=1 by
for the induction step if you let N=m+n
dividing by x we get
i think that may be right any other suggestions???
#10 Re: Help Me ! » index laws » 2008-04-25 06:33:13
I don't think there is any need for rudeness, this person requires help there's no need for put downs
#11 Help Me ! » Mechanics » 2008-04-24 22:16:01
- ROBBYM
- Replies: 3
A parachutist of mass m, falling vertically with mass m , speed U at height h above ground, he experiences a resistance equal to
show that the velocity at time t isso this is what i've done so far
from newtons 2nd i get:
which becomes:
where K is the position vector
taking the dot product i with the z components we get
dividing by m
let
then we get:the integrating factor is
this becomes:
integrating this gives:
which becomes:
where
so
So i get the general solution
Now its obvious this is not the required solution if anyone can please help me to get the complete solution i will be very gratefull
#12 Help Me ! » Group theory - lagranges theorem » 2008-04-24 21:26:24
- ROBBYM
- Replies: 1
Let G be the group
the set of binary vectors in which ai=0 or 1Let H be the subset of G consisting of all binary vectors with an even number of 1's. show that H is a subgroup of G.
Determine the order of H
please help me with this question i've had a look at proofs of lagranges theorem but i dont really see how i can possibly apply it to this question.
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