 |
|
|
|
|
|
|
|
|
The size of a parabolic transmitter/receiver |
2007-03-26 |
|
Evan pose la question :
I am making a parabola for my home wireless LAN. I feel pretty confident
that I can make a parabolic trough that will work. But I am curious about
size. Is there really any advantage to using a deep (more depth) parabolic shape
over a shallow one as long as you use the correct focal point. And is bigger better?
I know that my parabola has to be bigger than the waves it is getting which
wont be a problem but if I make the diameter bigger does it get more effective or
is there such a thing as "too much of a good thing"? I have looked everywhere
for an answer and have come up short. Thanks!
Stephen La Rocque lui répond. |
|
|
|
|
|
|
Simplifying an expression in probability |
2007-03-26 |
|
Natasha pose la question :
well it is
p(4) =
5!
------ X (0.5) ^4 X (1- 0.5)^5-4 = 0.15625
4!(5-4)!
Now the ^ is to the power of (I believe) Its written in the book as
(1-0.5)4 (but the 4 is little and on the top right corner of the first bracket
now the second ^5-4 is also little on the top right corner of the 2nd
bracket.
This is an equation from my text book but for the life of me I cannot figure
out how to solve it. If you can give me step by step procedure I'd
like that. The answer is also there I just don't know how to get to the
answer. Thank you.
Stephen La Rocque lui répond. |
|
|
|
|
|
|
The area of an irregular pentagon |
2007-03-26 |
|
grace pose la question :
hi I am doing graphics and need to find the area of the section given to us (it is just drawn). the sides measure 15m, 35.4m, 5m, 17.8m, 35.7m. the angle between the 15m side and the 35.4m side is 17degrees, the angle between the 35.4m side and the 5m side is 73degrees. the angle between the 5m side and the 17.8m side is 151degrees, the angle between the 17.8m side and the 35.7m side is 90degrees and the angle between the 35.7m side and the 15m side is 95degrees. if you could tell me the area i would be extremely grateful. thanks very much.
Penny Nom lui répond. |
|
|
|
|
|
|
Inscribed square in inscribed circle |
2007-03-25 |
|
Confuzzled pose la question :
"The largest possible circle is drawn inside a square. Then the largest possible square is drawn inside this circle. What is the area of the inner square as a fraction of the area of the outer square?"
This is a question from the Grade 8 Gauss contest and I don't know how to work it out without drawing it. My teacher says it's possible but I still don't get it. Please help!!!
Stephen La Rocque lui répond. |
|
|
|
|
|
|
Painting a pool |
2007-03-25 |
|
vincent pose la question :
Determine the total cost to put 2 coats of paint on the interior pool
and amount of water needed to fill pool
facts:
a gallon of paint will cover 50 square feet and cost $18.00
the pool will be filled when water is leveled 6" from the top of pool
there are approximately 7.48 gallons of water per cubic foot
Rectangle shape pool 36.0 long and 20.0 wide from top
Stephen La Rocque lui répond. |
|
|
|
|
|
|
A hexagon with an area of 36 |
2007-03-24 |
|
shell pose la question :
the formula for a hexagon with the area of 36 or close to that
Stephen La Rocque lui répond. |
|
|
|
|
|
|
Friction of a skier |
2007-03-24 |
|
William pose la question :
An olympic skier moving at 20.0 m/s down a 30 degree slope encounters a region of wet snow and slides 145m before coming to a halt. What is the coefficient of friction between the skis and the snow?
Stephen La Rocque lui répond. |
|
|
|
|
|
|
Four people in a car |
2007-03-24 |
|
shannon pose la question :
If there are 4 people in a car and only 1 can drive how many possible ways the the people sit in the car?
Penny Nom lui répond. |
|
|
|
|
|
|
The distance between two fire towers |
2007-03-23 |
|
tony pose la question :
Two fire towers are 30km apart, tower A is due west of tower B. A fire is spotted from the towers, and the bearing from A and B are N76degreesE and N56degreesW, respectively. Find the distance from the fire to the straight line connecting tower A to tower B.
Stephen La Rocque lui répond. |
|
|
|
|
|
|
A linear system |
2007-03-23 |
|
Adam pose la question :
Solve the system by graphing:
4y>6x
-3x+2y<-6
Stephen La Rocque and Penny Nom lui répond. |
|
|
|
|
|
|
Graphing a line |
2007-03-23 |
|
mitchell pose la question :
Graph each equation.
y = 2x + 4
Jaymi Peterson and Haley Ess lui répond. |
|
|
|
|
|
|
The volume of a hopper |
2007-03-23 |
|
amitesh pose la question :
Let me know how to calculate the tonnage of hopper / bins / chutes of different sizes and dimensions.
Penny Nom lui répond. |
|
|
|
|
|
|
An inheritance problem |
2007-03-23 |
|
Carl pose la question :
A father of 3 boys, who owns 17 horses dies. He leaves his first son
1/2 of the horses. The sons hate each other. The father leaves the
second son 1/3 of the horses. They are ready to kill each other. He
leaves his youngest son 1/6 of the horses.
Without cutting the horses into pieces how do they split the horses?
I heard this puzzle when I was 12 years old.
1968
The preacher rides up on his horse and said "If I give you my horse will
you quit fighting ? They agree to stop fighting?" Why?
Penny Nom lui répond. |
|
|
|
|
|
|
The law of cosines |
2007-03-23 |
|
chetna pose la question :
Q 1) In triangle LMN, l=7, m=5 , n=4. find ANGLE N.
After applying the rule and substituting values i'm getting
Cos n= 58/40. Is there something wrong. The answer at the back of the book is 34 degrees.
Penny Nom lui répond. |
|
|
|
|
|
|
The game of 24 |
2007-03-22 |
|
Britney pose la question :
I have a math problem with the game 24. I am not sure how to solve it.
You can use +, -, multiplication, division, ( ), square root, and exponents.
Please help me. The numbers are 1, 6, 7 and 8. You have to use all the
numbers and you can only use them once.
Penny Nom lui répond. |
|
|
