Science & Mathematics - 15 December 2007

Please Simplify The Following Expression...
5(3x-2)-4-2(4=x)

2007-12-15 05:49:14 · 12 answers · asked by bumble 3 in Mathematics

A 70.7kg high jumper leavs the ground with a vertical velocity of 6.2 m/s. The acceleration of gravity is 9.8m/s^2.

How high can she jump? Answer in units of m.

THANKS!

2007-12-15 05:43:03 · 3 answers · asked by Jordan K ® 3 in Physics

What is the percentage strength of a solution that is made by adding 200 ml of purified water to 600 ml of a 25% solution?

My answer is 75%, but my workbook answer states it is 18.75%. I have no idea how that answer was achieved. Help! Thank you!

2007-12-15 05:42:11 · 2 answers · asked by TheCoffeeDiva 7 in Mathematics

which is which...
is the following kingdoms of living ornganisms prokaryotes or eukaryotes?

-animals
-plants
-protactista
-fungi
-bacteria

thanks :]

2007-12-15 05:41:54 · 11 answers · asked by Anonymous in Biology

reaction forces involving the rope. If the rope moves toward the white dog, what do you know about the forces on the rope?

2007-12-15 05:41:44 · 4 answers · asked by Anonymous in Physics

Sometimes theres blood on the toilet paper, so I want to get checked by the doctor. I think I have internal hemo

I'm a 15 year old male. What would the doctor do to me? Would it take long? Is he going to do it the same day we go to his office?

Thanks

2007-12-15 05:40:34 · 1 answers · asked by himynameis. 2 in Medicine

Find the area between a parabola y=-4 x^2 + 0 x +64 and the x-axis.
HINT: Find the intersection points of the parabola with the x-axis first.


Area=

2007-12-15 05:40:16 · 3 answers · asked by Anonymous in Mathematics

2007-12-15 05:38:12 · 3 answers · asked by Anonymous in Geography

i'm doing a project on the bridge of lions and its replacement bridge. i have to compare construction dates, construction costs, type of bridge, building materials, load, and volume. you dont need to tell me that, just a website that could help me with that info. the help is greatly appreciated. thank u so much!!

2007-12-15 05:34:33 · 1 answers · asked by Anonymous in Engineering

1. A light plank rests on two scales that read Fg1 = 450 N and Fg2 = 280 N. The scales are separated by a distance of 2.00 m. How far from the woman's feet is her center of gravity?


2.Two window washers, Bob and Joe, are on a 3.00 m long, 380 N scaffold supported by two cables attached to its ends. Bob weighs 765 N and stands 1.00 m from the left end. Two meters from the left end is the 500 N washing equipment. Joe is 0.500 m from the right end and weighs 850 N. Given that the scaffold is in rotational and translational equilibrium, what are the forces on each cable?

If I am missing information let me know. Thanks.

2007-12-15 05:34:12 · 1 answers · asked by loveall 3 in Physics

2007-12-15 05:33:59 · 11 answers · asked by ally 1 in Mathematics

An equilateral triangle has an area of 9 times the sq root of 3.
How many inches is the perimeter?
9
9 times the sq. root of 3
18
18 times the sq. root of 3
What's the image of (5, -2) when it's reflected across the line y=-x?
5,10
5,1
-5,-10
-5,-1
What's the next # in the sequence? 0,1,-1,3,-5,11,-21,...
-64
-43
-43
64
For which conditional statement is the contrapositive true?
1.If a polygon has 4 sides then it's a quadrilateral
2.If a polygon has 4 sides then it's not a quadrilateral
3.If a polygon doesn't have 4 sides then it's a quadrilateral
4.If a polygon's a quadrilateral then is doesn't have 4 sides

According to the Law of Detachment, whis is a logical from these 2 statements: IF the temp is 95 degrees outside, then Jo will run her AC. The temp is 98
1.The temp is above 95
2.Jo will not run her AC
3.The temp is not 95
4.Jo will not run her AC
What's the slope of a line that is || to the line whoes equation is y-10= - 4(x+1)
-10
-4
-1/4
1/4

2007-12-15 05:32:58 · 1 answers · asked by Anonymous in Mathematics

How have computers have changed the ways doctors treat patients?

I have to write an 8 page report, 2000 - 2500 words, and it's due this tuesday. Help me!

2007-12-15 05:31:32 · 2 answers · asked by amanda_tommy 2 in Medicine

Estimate the following product or quotient
17 11/12 / divided by 6 1/10 would I find a common denominator then divide???

2007-12-15 05:29:50 · 6 answers · asked by Flyyasever 3 in Mathematics

1: Why do we only see one side of the moon from Earth?
the Moon rotates at the same speed as the Earth
You can see different sides of the moon from varying locations on Earth
The Moon rotates one time on its axis every time it orbits the Earth
The moon rotates one time on its axis every time it orbits the sun
None of the above

2: How long does it take the moon to orbit the Earth with respect to the sun (called the synodic period)?
29 1/2 days
30 days
26days
31 days
None of the above

3: What are the dark features on the moon's surface?
Volcanos
Maria or Mare
Ray craters
Marks left by the Apollo landings
None of the above

4: What are the bright features on the moon's surface?
Volcanos
Mare or basins
Ray craters
Marks left by the Apollo landings
None of the above

5: What effect does the Moon's gravitational pull have on the earth?
The moon keeps the Earth on an even keel on its axis
The moon causes the rise and fall of the Earth's ocean tides
The moon does not have an effect on the Earth's surface
Both a and b
All of the above

2007-12-15 05:24:38 · 5 answers · asked by Anonymous in Astronomy & Space

5a + 2(3a + 4) - 2a

2007-12-15 05:24:09 · 12 answers · asked by bumble 3 in Mathematics

1: Every few hundred thousand years, what mysterious phenomenon occurs on earth?
a. an ice age---what I think
b. extinction of species
c. planet-wide volcanic eruptions
d. the reversal of the magnetic poles

2: The plates of the earth moving on the molten rock below caused ___________.
a. continental drift
b. larger oceans
c. tornadoes and hurricanes
d. none of the above--what i think

3: The variation in the length of day and night is caused by ____________.
a. the varying temperature of the sun
b. the gravity of the moon
c. the tilt of the earth's axis---what i think
d. the measure of the earth's diameter

4: ________ surround the planet because high pressure air always moves toward low pressure air.
a. winds-- i think
b. clouds
c. ocean waves
d. snow-capped mountains

5: It has happened before. It will happen again. What is it?
a. the shift in the content of earth's atmosphere to all carbon dioxide
b. the ice age--- what i think
c. the reversal of earth's orbit
d. none of the above

2007-12-15 05:22:50 · 7 answers · asked by Anonymous in Earth Sciences & Geology

then would any mountains come of it?

2007-12-15 05:20:39 · 3 answers · asked by Piranhatron 3000 3 in Earth Sciences & Geology

2007-12-15 05:19:59 · 8 answers · asked by Mrs. Kirk 2 in Geography

But, not a nurse or doctor also one that pays well. Thanks in advance.

2007-12-15 05:16:00 · 4 answers · asked by Tavares 2 in Medicine

Can you give me an explanation with the original equations for these problems? I have a bunch more, but if these are explained to me, I'm sure I can get the rest.

1. A 3.91 kg briefcase is sitting at rest on a level floor. The acceleration of gravity is 9.81 m/s^2.
What is its acceleration (answer in units of m/s^2)?
What is its weight (Answer in units of N.)?
2. Once a 26 kg crate is in motion on a horizontal floor, a horizontal force of 52N keeps the crate moving with a constant veloctity.
The acceleration of gravity is 9.81 m/s^2.
What is the coefficient of knetic friction, between the crate and the floor?

Ok, so I realize this is my homework and i need to do it myself, so I am going to stop putting problems up, but I was looking at the rest and It would be great if someone could tell me how to find the coefficient of static friction, coefficient of kinetic friction, and how to find those if they give me degree measures to use also.

2007-12-15 05:10:08 · 2 answers · asked by 5.8caloriewater 2 in Physics

2007-12-15 05:09:46 · 3 answers · asked by Anonymous in Mathematics

Given x over 4=y over 8, find x over y.

how do you do this?

thanks :]

2007-12-15 05:05:40 · 6 answers · asked by luckyplaya23 2 in Mathematics

exm: tables, graphs and equations

2007-12-15 05:03:52 · 1 answers · asked by Anonymous in Mathematics

2007-12-15 05:03:39 · 7 answers · asked by tonyotero24 1 in Geography

Let B be a Baire space, M a metric space and D a subset of B which is meager and dense in B. Show there's no f:B --> M that is continuous precisely at the elements of D.

Based on this fact, conclude there's no f:R^m --> R^n continuous precisely at the elements of.Q^m.

thank you.

2007-12-15 05:02:14 · 3 answers · asked by Anonymous in Mathematics

I can't remember how to figure that out on a calculator.

2007-12-15 05:00:06 · 7 answers · asked by happy b 1 in Mathematics

One afternoon I was taking a nap on my couch and something happend. I was the only person in the house. Right before I woke up, I saw a woman with blonde hair and blue eyes. When I was laying down on the couch, she smiled and kissed me. After that, she left and I woke up. Can anyone explain this? Have anyone had any similar experiences?

2007-12-15 04:53:23 · 24 answers · asked by fayt84 6 in Paranormal Phenomena

A 42 kg of ice slides down the plane incline 34 degrees in the figure. Assuming friction is negligible, what is the acceleration of the block down the incline? If the kinetic coefficient of friction is 0.060, what is the acceleration of the block down the incline?

Please show and explain all work. Please show the formula or formulas that were used.

2007-12-15 04:52:09 · 2 answers · asked by Anonymous in Physics

show the function y = x^2 / (x+1)(x-2)

never has any values between 0 and 8/9.

I can show that when y = 0 the function has the root of x = 0 twice. Implying a local maximum or minimum. Then by taking x = 0.1 and -0.1 I can show it is a maximum.

Then taking y = 8/9 the root is x = -4 twice. Then by taking
x = -4.1 & -3.9, this is a minimum. Does this prove the above question, do I need more, or do I need to do it in a completely different method?

Does the fact that the function is quadratic mean that the fuction will only hit these points twice (even though the twice in this case is at the same x-value) even if the domain is all the real numbers?

If so this means that the function can never pass into these points again. Right?

2007-12-15 04:50:53 · 2 answers · asked by eazylee369 4 in Mathematics