Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 Re: Help Me ! » Vectors equation of line of action of a force » 2011-04-01 08:40:31

many thanks for your great illustration

## #2 Re: Help Me ! » Vectors equation of line of action of a force » 2011-04-01 05:20:46

you  make it on the perpendicular ??!

## #3 Re: Help Me ! » Vectors equation of line of action of a force » 2011-04-01 04:50:03

am sorry if it seems lyk a stupid question

## #4 Re: Help Me ! » Vectors equation of line of action of a force » 2011-04-01 04:46:03

thank u Bob I was about 2 lose hope but why did u impose that The point (x,y) is where a line from (1,4) meets the line of action of F at 90 degrees? Sorry for bothering u

## #5 Help Me ! » Vectors equation of line of action of a force » 2011-03-25 20:34:39

Avva
Replies: 8

Hi everbody ,

If  F= 2i-3j , and if the moment vector of F about B (1,4) equals 16 k

find the equation of the action line of F .

Sorry can't write in LaTex

Help appreciated

## #6 Re: Help Me ! » Lami Rule and Triangle of forces statics » 2011-03-25 20:05:50

many thnx John I didn't know How I missed cosine law

## #7 Help Me ! » Lami Rule and Triangle of forces statics » 2011-03-22 01:15:04

Avva
Replies: 4

Three coplanar forces 8, 10 and 12 newtons act at a particle. If the forces are in equilibrium, What is the measure of the angle between

the two forces 10 and 12 newtons?

## #8 Re: Help Me ! » Related Time Rates Problem » 2010-11-09 00:14:48

thanks for ur reply I appreciate it . I think that this is the right solution , I have been searching for a related time problem like this one but I found none but at the same time I didn't think that the sol might be that easy one.The textbook is my school book and we're in secondary school so the ministry in our country  prepare it without writing the references. Many Thanks

## #9 Re: Help Me ! » Related Time Rates Problem » 2010-11-08 23:03:03

Yup, I have. we're studying principles of  differential and integral calculus I solve related time rates problems but this kind is odd according to me and I can't figure it out I used to solve Time and Distance problems using differential equations . please help me solve this kind.Tx 4 ur reply

## #10 Help Me ! » Related Time Rates Problem » 2010-11-08 22:20:23

Avva
Replies: 5

Liquid is leaking from a small hole in a vessel full with the liquid. The volume of the liquid changes at the rate of (0.4t-40)cm³/sec.

find:
1- The volume of the vessel
2- When the vessel becomes empty?
given that the volume of the liquid was 980cm³ after 30 seconds from the start of leaking.

PLEASE Explain your answer and if you can give me guide steps to solve problems like this '

I'm from Egypt

## #12 Re: Help Me ! » HELP limit problem » 2010-02-12 05:37:12

we don't solve it that way it is unofficial in our curriculum to solve it using derivative we use these rules http://library.thinkquest.org/C006002/Pages/Rules_of_Limits.htm

## #13 Help Me ! » HELP limit problem » 2010-02-11 21:33:03

Avva
Replies: 3

help me solve this limit probem

## #14 Re: Help Me ! » derivative and average rate of change » 2010-02-11 21:07:34

many thnx highly appreciated

## #15 Re: Help Me ! » derivative and average rate of change » 2010-02-11 20:25:26

when I substitute with -4 in rate of change and average rate of change it didn't give me the given values
but with -2 it did Is this the right reason???

## #16 Re: Help Me ! » Simple limit with a radical » 2010-02-11 17:57:21

multiply it by the conjugate then divide each term under the cubic root by x^3 and out the root by x

## #17 Re: Help Me ! » derivative and average rate of change » 2010-02-11 17:22:19

sorry for bothering you I just wanna know which solution is right MANYYYY Thnx

## #18 Re: Help Me ! » derivative and average rate of change » 2010-02-11 09:29:18

Actually I didn't study it that way am in high school so we learn only headlines Thnx 4 ur help

## #19 Help Me ! » derivative and average rate of change » 2010-02-10 04:50:58

Avva
Replies: 9

If  , rate of change of this function =-3/4 at x=4 , and the average rate of change =-5/6 when x changes from 4 to 3.8 ,
FIND the values of a and b.

## #20 Help Me ! » log » 2010-01-31 06:50:25

Avva
Replies: 2

loglog(x^2-7x+15)=123

## #21 Help Me ! » trigonometry » 2009-11-29 00:35:00

Avva
Replies: 1

Without using calculator:
prove that:

## #22 Re: Help Me ! » HELP graphing fraction function » 2009-10-31 08:21:28

SORRY I'd mistaken the sign preceding 1 in the numerator
my Mr solved it for me today
F(x)=x^2-x+1/(x+1)(x^2-x+1)=1/x+1
http://www.mathsisfun.com/data/function-grapher.php?func1=(x^2-x-1)/(x^3+1)&xmin=-12&xmax=12&ymin=-8&ymax=8
Domain=R-{-1}
Range=R-{0}
Decreasing in (-∞,∞)-{-1}

Tx bobbym

## #24 Help Me ! » HELP graphing fraction function » 2009-10-30 10:38:00

Avva
Replies: 4

graph the following function and state its properties:

Appreciated Bro