Science & Mathematics - 24 October 2007

The frequency distribution summarizes a sample of time (in mins) between eruptions of a certain geyser. Find the standard deviation of the data. (ONLY ANSWER NEEDED, NO NEED TO SHOW WORKING)
Time Frequency
40-49 10
50-59 41
60-69 23
70-79 6
80-89 104
90-99 15
100-109 1

2007-10-24 06:08:07 · 2 answers · asked by austin 1 in Mathematics

I need help badly !!!

Here's a picture of the figure/question

http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c10/fig10_42.gif

In Fig. 10-44, a cylinder having a mass of 3.2 kg can rotate about its central axis through point O. Forces are applied as shown: F1 = 6.2 N, F2 = 3.0 N, F3 = 5.0 N, and F4 = 9.5 N. Also, r = 5.8 cm and R = 16 cm. Taking the clockwise direction to be negative, find the angular acceleration of the cylinder. (During the rotation, the forces maintain their same angles relative to the cylinder.)

I need to get a solution rather than just an answer, i need to learn, thanks to everyone who posts.

-Joe

2007-10-24 06:07:41 · 3 answers · asked by Anonymous in Physics

2007-10-24 06:06:54 · 6 answers · asked by Anonymous in Mathematics

With the function f(X) = (x)^(1/2), (square root function), what is the instant rate of change when x =0?

2007-10-24 06:01:11 · 7 answers · asked by Ask or Answer 2 in Mathematics

Do they use a needle?

2007-10-24 06:00:54 · 5 answers · asked by Anonymous in Medicine

2007-10-24 05:59:59 · 2 answers · asked by Anonymous in Physics

2007-10-24 05:59:14 · 4 answers · asked by T-Luv 4 in Physics

2007-10-24 05:57:01 · 3 answers · asked by lassie_lolita 1 in Botany

I'm stuck on this problem, please help!

s^6 * t^10
------------- * (100 * s^6 * t^6)
4

* = multiplied by

2007-10-24 05:56:24 · 2 answers · asked by Anonymous in Mathematics

2007-10-24 05:53:06 · 1 answers · asked by The Universal Brain System 1 in Biology

One wonders if life forms were to be found elsewhere would such be accepted or nuked? Nobody expresses what happens next. Would we accept such life form as threat or friend?
Is this a good idea or should it be ceased?

2007-10-24 05:52:11 · 11 answers · asked by Anonymous in Astronomy & Space

We all know that water is H2O, so why cant we manufacture it?

2007-10-24 05:51:27 · 3 answers · asked by Petero 6 in Chemistry

a. The First Law of Thermodynamics

b. The Second Law of Thermodynamics

c. The Law of Non-contradiction

2007-10-24 05:49:27 · 7 answers · asked by Anonymous in Physics

Dynamite! A demolition crew uses dynamite to blow an old building apart. Debris from the explosion flies off in all directions, and is later found at distances up to a distance x from the explosion.

Find the maximum speed at which debris was blown outward by the explosion. Neglect air resistance.

2007-10-24 05:49:26 · 4 answers · asked by Anonymous in Physics

1- What is the equation for Kinetic Energy and Momentum?

2- What is the difference between an inelastic and elastic collision?

3- What does conservation of momentum mean?

4- A mosquito splats against the windsheild of a car travelling down the interstate at some large but legal velocity. Which has the largest change of momentum from the collision?

- the car
- the mosquito
- the road
- none of the above


Thanks for your help.

2007-10-24 05:47:47 · 4 answers · asked by Anonymous in Physics

2007-10-24 05:46:38 · 3 answers · asked by Anonymous in Weather

If i have a metal sphere and I need to calculate the height it must fall from, I know the weight of the sphere, this radius (I have the sphere) air resistance doesn't matter and it will be falling under the earth's gravity (I don't quite have the money to pop into space)

10 points for best answer

2007-10-24 05:45:40 · 2 answers · asked by prof. Jack 3 in Physics

algebra is a mathimatical system

2007-10-24 05:42:03 · 6 answers · asked by chutes_44 1 in Mathematics

2007-10-24 05:41:13 · 3 answers · asked by Yahoo! 5 in Physics

According to our Water Softener supplier, the EC of Soft water always the sme with the EC of Well Water. Is it make a sense? According to them the softener will catch Ca, Mg ion, but not effect for the EC of the water. Is make a sense?

2007-10-24 05:40:16 · 1 answers · asked by Handoyo 1 in Chemistry

what is the enthalpy of dissolution of sodium carbonate (Na2CO3)???

2007-10-24 05:36:30 · 2 answers · asked by freestylefri2000 1 in Chemistry

I dont know what the independent variable, dependent variable, or control is. The procedure is: I will boil a few eggs. Next I will take a glass bottle and light a piece of newspaper and put the newspaper in the bottle. Then I will place the egg on the neck of the bottle and watch what happens.

2007-10-24 05:35:44 · 19 answers · asked by Lanie 1 in Chemistry

2007-10-24 05:32:00 · 5 answers · asked by clody54 1 in Weather

after all the planets, the astroids, the galaxies, were do you think space came from, we know pretty much of were the planets and stars came from, but were do you think space came from.

2007-10-24 05:27:13 · 5 answers · asked by Aaron H 1 in Astronomy & Space

When I got home around ten at night, it was hot as an oven and I could smell the linoleum floors. I opened the doors and turned the air conditioner and fan on high. After an hour or so it finally began to cool down. Interestingly enough, though, it would get warm throughout the night and I'd have to turn the air conditioner back on. Today, I feel somewhat shaky, am having some GI symptoms and have a strange sensation in my mouth and nose - which still continues and can only be discribed as feeling like I just smoked a pack of menthol cigarrettes (I'm not a smoker, though). Does anyone have any ideas as to whether these irritations are connected to my overheated trailer or if this is just a coincidence? My mom theorizes that it could be anything from the linoleum to insulation. Does anyone know anything regarding such products from a more scientific/ consumer knowledge stand? Could it be a possibility and if so, what can I do to conteract these symptoms? Any references are appreciated!

2007-10-24 05:24:19 · 2 answers · asked by fragglerockqueen 5 in Other - Science

2007-10-24 05:24:15 · 3 answers · asked by ecast4uhm246 1 in Physics

2007-10-24 05:23:40 · 5 answers · asked by Anonymous in Physics

2007-10-24 05:22:49 · 6 answers · asked by lupenorm 1 in Engineering

2007-10-24 05:22:05 · 4 answers · asked by Anonymous in Biology

2007-10-24 05:22:00 · 3 answers · asked by Anonymous in Medicine