Science & Mathematics - 25 September 2007

please help me i have a quiz on this kind of question in 45 min and i am really worried about this question. the formula of sin(x) = sinc (2x) is sin(2x) = cos2x-sinn2x

2007-09-25 06:05:46 · 3 answers · asked by Facilitate 1 in Mathematics

A: require applications of pesticides
B: Are subject to continuous invasion by pathogens and weeds
C: Are usually capable of self-maintenance and self-renewal
D: have most of their biomass in one species
E: Require applications of nutrients

2007-09-25 06:03:10 · 1 answers · asked by white tea 1 in Earth Sciences & Geology

2007-09-25 06:02:12 · 3 answers · asked by ccutestuff2001 2 in Chemistry

express the answer in tems of intervals, if possible. may need inf and cup symbols.

2007-09-25 05:48:03 · 1 answers · asked by Anonymous in Mathematics

Planet X has two times the diameter and eight times the mass of the earth.

What is the ratio gx : ge of gravitational acceleration at the surface of planet X to the gravitational acceleration at the surface of the Earth?

2007-09-25 05:45:31 · 4 answers · asked by Jaweida S 1 in Physics

express the answer in tems of intervals, if possible. may need inf and cup symbols.

2007-09-25 05:44:50 · 1 answers · asked by Anonymous in Mathematics

Find the magnitude of the gravitational force
a 62.6 kg person would experience while
standing on the surface of Earth with a
mass of 5.98 *10^24kg and a radius of
6:37 *10^6 m. The universal gravitational
constant is 6.673 * 10^ -11 N * m2/kg2. Answer
in units of N.

Find the magnitude of the gravitational force on Mars, with a a mass of 6.34x10^23 kg and a radius of 3.43x10^6m. answer in units of N.

Find the magnitude of the gravitational force on pluto with a mass of 1.32x10^22 kg and a radius of 1.15x10^6m. Answer in units of N.

2007-09-25 05:43:19 · 2 answers · asked by Jaweida S 1 in Physics

2007-09-25 05:42:03 · 5 answers · asked by Anonymous in Mathematics

Lately I have been thinking a lot about planets and how large do they need to be, not to mention how far does planet need to be in order for it to be like Earth. Mainly I want to know how far and how big a planet need to be to be habitable, especially if the star is as big as the one called Sirius, or nearly as big. I heard today that the Earth's equator is about 24,901.55 miles, and the Sun's diameter is equal to 109 Earth's)

2007-09-25 05:37:23 · 4 answers · asked by Anonymous in Astronomy & Space

find the magnitude of the gravitational force a 66.6 kg person would experience while standing on the surface of Earth with a mass of 5.98x10^24 kg and a radius of 6.37 x 10^6m. The universal gravitational constant is 6.673x10^-11 N*m^2/kg^2. Answer in units of N.

Find the magnitude of the gravitational force on Mars, with a a mass of 6.34x10^23 kg and a radius of 3.43x10^6m. answer in units of N.

Find the magnitude of the gravitational force on pluto with a mass of 1.32x10^22 kg and a radius of 1.15x10^6m. Answer in units of N.

2007-09-25 05:36:47 · 1 answers · asked by yoyoyoyoyoyo 2 in Astronomy & Space

they're negative and nucleus is positive they're are supossed to atract. where am i wrong?

2007-09-25 05:35:15 · 4 answers · asked by Anonymous in Chemistry

Describe how careful measurments of the variation in gravity in the vicinity of an ore deposit might be used to estimate the amount of ore present?

2007-09-25 05:34:01 · 1 answers · asked by Anonymous in Physics

isn't it supossed to repel each other?

2007-09-25 05:31:59 · 5 answers · asked by Anonymous in Chemistry

2007-09-25 05:25:28 · 2 answers · asked by Anonymous in Chemistry

What mass, in grams, of ZnCl2 can be prepared from the reaction of 3.27 grams of zinc with 3.30 grams of HCl? Zn + 2HCl → ZnCl2 + H2

2007-09-25 05:22:54 · 2 answers · asked by mike g 1 in Chemistry

2007-09-25 05:22:16 · 1 answers · asked by tramvu05 1 in Mathematics

ok so who was Hernan Cortez and what did he do for the modern world. oh and was he an explorer or exploiter ? please anser back

2007-09-25 05:21:25 · 4 answers · asked by Doug H 1 in Engineering

some spcial vehicles have spinning disks to store energy whil they roll downhill. they use that stored energy to lift themselves uphill late on. their flywheels have relatively small rotational masses but spin at enormous angular sppes. how would a flywheel's kinetic energy change if its rational mass were FIVE times larger bit its angular speed were FIVE times smaller?

2007-09-25 05:19:53 · 2 answers · asked by sippy85 1 in Physics

How does it?

2007-09-25 05:19:43 · 15 answers · asked by pidster 2 in Biology

Find its average acceleration in term of g

2007-09-25 05:19:30 · 2 answers · asked by salvatore g 1 in Physics

radian measure of the central angle of a circle of radius r that intercepts an arc length of s

Radius r = 1 meter

Arc length s = 600 centimeters


ty for helping

2007-09-25 05:15:09 · 5 answers · asked by Anonymous in Mathematics

Please answer my question! :p...thank you

2007-09-25 05:12:13 · 3 answers · asked by mathewL 3 in Physics

u dont have to answer all of these, but please explain how you figured it out.

1. At what angle should a slingshot be oriented for maximum altitude? for maximum horizontal range?

2. neglecting air resistance, if u throw a ball straight up with a speed of 20m/s, how fast will it be moving wen u catch it?

3. A projectile must be moving 8km/s in order for it to match the curve of the Earth. Question: why is it important that such a satellite be above the earth's atmosphere?

2007-09-25 05:11:53 · 1 answers · asked by Anonymous in Physics

What would be the base 8 representation of decimal number 64?

Can someone tell me 2 methods?( long way, and quick short-cut method)

2007-09-25 05:10:23 · 6 answers · asked by Anonymous in Mathematics

an electric saw uses a circular spinning blade to slice through wood. when you start the saw, the motor needs 2 secs of constant angular acceleration to bring the blade to its full angular velocity. of you change the blade so that the rotational mass, how long will the motor need to bring the blade to its full angular velocity?

2007-09-25 05:08:04 · 1 answers · asked by goofy 2 in Physics

i wana see more color pictures, why didn't they send more color pictures from mars? it doesn't make any sense
is it because of the huge data they have to send and Black and white takes much less data space?

2007-09-25 05:06:02 · 9 answers · asked by Anonymous in Astronomy & Space

(Moving objects with your mind)

2007-09-25 05:05:19 · 19 answers · asked by Anonymous in Parapsychology

Q1) solve the equation
3x^2 - 5x -1 = 0,
giving the answers correct to two decimal places.

2007-09-25 05:04:01 · 3 answers · asked by Anonymous in Mathematics

A check-out person would not sell me Paracetemol and Ibuprofen both at the same time, however I have bought 2 packs of each at the same time on past occassions. Where does the law stand on this - the check-out person said it was against the law - I suspect it has more to do with store policy.

2007-09-25 05:01:21 · 15 answers · asked by Shirls 1 in Medicine

i was in bed and i woke up in the middle of the night and i felt this strange feeling, to be honest it was like a friendly presence but as usual only i was in the room.... so what was it some kind of spiritual encounter or psychic phenomena?

2007-09-25 04:57:14 · 7 answers · asked by Anonymous in Parapsychology