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The size of a parabolic transmitter/receiver |
2007-03-26 |
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From Evan:
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!
Answered by Stephen La Rocque. |
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Simplifying an expression in probability |
2007-03-26 |
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From Natasha:
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.
Answered by Stephen La Rocque. |
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The area of an irregular pentagon |
2007-03-26 |
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From grace:
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.
Answered by Penny Nom. |
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Inscribed square in inscribed circle |
2007-03-25 |
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From Confuzzled:
"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!!!
Answered by Stephen La Rocque. |
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Painting a pool |
2007-03-25 |
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From vincent:
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
Answered by Stephen La Rocque. |
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A hexagon with an area of 36 |
2007-03-24 |
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From shell:
the formula for a hexagon with the area of 36 or close to that
Answered by Stephen La Rocque. |
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Friction of a skier |
2007-03-24 |
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From William:
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?
Answered by Stephen La Rocque. |
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Four people in a car |
2007-03-24 |
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From shannon:
If there are 4 people in a car and only 1 can drive how many possible ways the the people sit in the car?
Answered by Penny Nom. |
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The distance between two fire towers |
2007-03-23 |
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From tony:
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.
Answered by Stephen La Rocque. |
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A linear system |
2007-03-23 |
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From Adam:
Solve the system by graphing:
4y>6x
-3x+2y<-6
Answered by Stephen La Rocque and Penny Nom. |
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Graphing a line |
2007-03-23 |
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From mitchell:
Graph each equation.
y = 2x + 4
Answered by Jaymi Peterson and Haley Ess. |
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The volume of a hopper |
2007-03-23 |
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From amitesh:
Let me know how to calculate the tonnage of hopper / bins / chutes of different sizes and dimensions.
Answered by Penny Nom. |
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An inheritance problem |
2007-03-23 |
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From Carl:
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?
Answered by Penny Nom. |
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The law of cosines |
2007-03-23 |
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From chetna:
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.
Answered by Penny Nom. |
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The game of 24 |
2007-03-22 |
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From Britney:
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.
Answered by Penny Nom. |
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