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Science & Mathematics - 17 November 2007

[Selected]: All categories Science & Mathematics

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a flight attendant pulls her 70.0 N flight bag a distance of 253m along a level airport floor at constant velocity. The force she exerts is 40.0 N at the angle of 52.0 degree above the horizontal. what is the work she does on the flight bag and the work done by the force of friction on the flight bag.
help please..............

2007-11-17 14:27:44 · 3 answers · asked by 832 1 in Physics

5

How long do you think mount pinatoubo has been dormant and when was it's last eruption??????

2007-11-17 14:26:59 · 9 answers · asked by Sarah M 2 in Earth Sciences & Geology

Is the world really going to end in 2012?

2007-11-17 14:26:56 · 56 answers · asked by Anonymous in Astronomy & Space

2007-11-17 14:25:47 · 6 answers · asked by bobbinbop20 2 in Engineering

I am sure it would not be hard to find some real scientists to carry with them on one of their "investigations". most professors don't make that much, and would welcome the extra money, and I think they would do it out of interest.

I have noticed that a lot of the "phenomena" that they use to declare a place haunted, to me can be explained in other ways, other than a extraordinary one.

I think it would be great to have 3-4 real scientists, physicists, etc. with them on one of their live shows. I would like to see the scientists reactions to some of the phenomena that they observe.

Looks like if we are really searching for the truth, that this would be a good idea.

Or would it just destroy the show.

2007-11-17 14:12:54 · 19 answers · asked by madcat 5 in Paranormal Phenomena

M phase means mitosis phase right???

2007-11-17 14:12:14 · 6 answers · asked by boby k 1 in Biology

please answer this question.. it's very crucial to me..

remember it's about number bases n don't forget to show the work

2007-11-17 14:08:10 · 10 answers · asked by you''ll never waklk alon 1 in Mathematics

A regular staple curves in, toward itself. What's the purpose of the one that curves out?

2007-11-17 14:06:40 · 5 answers · asked by downrightdoomsday 1 in Engineering

And is there any other body parts that grow for a period after death?

2007-11-17 14:06:05 · 2 answers · asked by bognogel 1 in Biology

2007-11-17 14:05:18 · 5 answers · asked by poohchii_pooh_xx7 1 in Physics

2007-11-17 14:03:54 · 2 answers · asked by stancarmen2002 2 in Biology

explain plzzz...i need it..tnx..

2007-11-17 13:57:24 · 4 answers · asked by rAvEn JoHn 2 in Physics

Typing a word document and don't know how to include the small clear circle before the c in degrees celsius. Please help.

2007-11-17 13:55:35 · 8 answers · asked by Anonymous in Chemistry

this is a math problem

2007-11-17 13:51:31 · 6 answers · asked by Rebecca M 1 in Mathematics

2007-11-17 13:47:00 · 9 answers · asked by pug99us 1 in Astronomy & Space

A)is rigid
B)dies
C)wilts
D)explodes

2007-11-17 13:46:08 · 4 answers · asked by china.tankson2010 1 in Biology

or at least perhaps minimizing this

2007-11-17 13:42:25 · 1 answers · asked by jamie 1 in Chemistry

Not sure how to do this...any help would be appreciated.

1.) A rectangle is inscribed in a semicircle of radius 2. What is the largest area of the rectangle?

2007-11-17 13:40:43 · 4 answers · asked by Sean G 1 in Mathematics

From precipitation, filtration, decantation and evaporation which method is more effective?

2007-11-17 13:38:21 · 6 answers · asked by jamie 1 in Chemistry

A) facilitated diffusion
B) Diffusion
C)Osmosis
D)Phagocytosis

2007-11-17 13:36:32 · 3 answers · asked by china.tankson2010 1 in Biology

A.) SO2 is an important oxide of sulfur. The critical temperature of SO2 is 158 ºC and the critical pressure is 78.0 atm. Predict if SO2 can be liquefied by applying pressure at 180º C. Explain your answer

B.)Carbon disulfide, CS2, is a volatile flammable liquid. It has a vapor pressure of 400.0 mmHg at 28.0 ºC and 760 mmHg at 46.5 ºC. What is the enthalpy of vaporization of CS2?

C.) Metallic gold forms cubic crystals whose unit cell has an edge length of 407.9 pm. The density of gold is 19.3 g/cm3. Calculate the number of gold atoms in a unit cell. What type of cubic lattice does gold have (FCC or BCC or SC)?

D.) Classify the following according to the forces of attraction (intermolecular forces) that exist between these solids a) solid ammonia, NH3, b) cesium Cs, c) Cesium iodide CsI, d) silicon Si

E.)Arrange the following in the order of increasing boiling point
i) CH3OH
ii) CH2OH----CH2OH
iii) CH3----CH3
iv) CH4

2007-11-17 13:34:00 · 1 answers · asked by Hellos 1 in Chemistry

i'm doing a science experiment to see if oil will spread faster in fresh water or salt water, but i dont know what to do with the oil when im finished. please help!

2007-11-17 13:33:33 · 18 answers · asked by Anonymous in Chemistry

you have a patient that is currently expererience extreme discomfort after eating a large quantity of beans. the pain is being caused by the build up of gas pressure in the lagre intestines. if you were able to put a pressure gauge into the the patient, which of the following would be a reasonable pressure that you might observe?

a.) 860 pounds pers square inch

b.) 860 pascal

c.)860 atmospheres

d.) 860 torr

2007-11-17 13:32:48 · 4 answers · asked by Katrina Green 2 in Physics

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