Science & Mathematics - 19 December 2007

I have no idea of how projectiles work and i need lots help in my physics class thank you very much if you can help me.

Symmetric
object launched at 60 degrees Vx=120m/s whatis the Vi?
How high does it go and what is the impact velocity.

Asymmetric
Mortar 250meters above a target, target 750meters horizontally away.If shells burts 6meter above ground If the Vi=225m/s what is the launch angle?

How do you find the range and max height with only the Vi, launch angel, Sine, Cosine, Vx, and Vi,y?

It would be very helpful if you can show the steps. Thank you very much!

2007-12-19 10:06:36 · 1 answers · asked by Serena M 1 in Physics

im sure i once saw a documentary which stated that the universe did actually have a definate boeder to it, and was hexagonal in structure ???? cant remember what it was called.

2007-12-19 10:05:22 · 17 answers · asked by Anonymous in Astronomy & Space

im supposed to make a frequency table and i dont know how to make one so that people will look at it and know what i spend my hours doing. pleez help!

2007-12-19 10:04:33 · 1 answers · asked by spidergurl 4 in Mathematics

1/ A heat engine operating between temperatures of 500K and 200K is used to lift a 10-kg mass vertically at a constant speed of 5m/s.
(a) Determine the power the engine must supply ro lift the mass (hint: mechanical power).
(b) Determine the maximum possible efficiency at which the engine can operate.
(c) If the engine were to operate at the maximum possible efficiency, determine the following...
i) The rate at which the hot reservoir supplies heat to the engine
ii) The rate at which heat is exhausted to the cold resevoir.

2007-12-19 10:03:33 · 1 answers · asked by leonardo 1 in Physics

2007-12-19 10:03:04 · 6 answers · asked by Anonymous in Earth Sciences & Geology

A 20 kg mass, released from rest, slides 6 meters down a frictionless plane inclined at an angle of 30 degrees with the horizontal and strikes a spring of spring constant k =200 newtons/meter as shown in the diagram above. Assume that the spring is ideal, that the mass of the soring is negligible, and the mechanical energy is conserved.
a) Determine the speed of the block just before it hits the spring.
b) Determine the distance the spring has been compressed when the block comes to rest?
c) Is the speed of the block a maximum at the instant the block strikes the spring?
d) if there is friction and a coefficient of .2 what is the speed of the block just prior to hitting the spring?
e) Imagine that there is no friction in the region where the spring is. What would be the distance that the block would travel up the incline after it rebounded from the spring?

2007-12-19 10:03:02 · 1 answers · asked by Ree H 1 in Physics

2007-12-19 10:02:53 · 4 answers · asked by Anonymous in Other - Alternative

x^3 - 6X^ 2

2007-12-19 10:00:10 · 2 answers · asked by sana_ahmad75 1 in Mathematics

log4a+log4b
log3m-log3n
3log5 2x
log3r+log3s+log3t
3log2r-2log2s
1/2(log10x-log10y)

2007-12-19 09:57:55 · 2 answers · asked by Anonymous in Mathematics

When investigating for ghosts or paranormal phenomena?
My opinion is no that we our bodies and the mind is really the only tool we need. But I no longer investigate to "prove" and "document" evidence of ghosts. My reason now is personal and to learn of life after death.

Team I am interested in hearing from you on this one. Thanks in advance

2007-12-19 09:57:48 · 6 answers · asked by Anonymous in Paranormal Phenomena

I had a physical today and I told the doctor about my anxiety about riding in vehicles and he prescribed paxil, I don't like taking meds so I checked it out on the internet and read a lot of bad things about it, and I'm thinking no way I would rather have the anxiety, have any of you had to take paxil, how was it?

2007-12-19 09:57:43 · 1 answers · asked by pumpkin2 1 in Medicine

If our planet, solar system, and galaxy are all moving in different directions and different speeds to what fixed point are they moving about?

2007-12-19 09:57:02 · 6 answers · asked by Java Junkie 1 in Astronomy & Space

After the yellow stone fire of 1988 how was the douglas fir harmed or benefited? Also what apations happend to it?
If someone could please help me these quetions itd be GREAT haha thankks

2007-12-19 09:53:27 · 4 answers · asked by soccerhamfrog8 1 in Geography

I heard on the radio this morning that the Red Cross is desperate for blood donations and they are looking for type O especially and that's what I am. I would love to donate, but will they allow me to if I have tattoos?

I have three and I have gotten them all within the last year, the most recent one I got last month

2007-12-19 09:52:24 · 5 answers · asked by me 1 in Medicine

2007-12-19 09:51:04 · 2 answers · asked by African Princess 2 in Chemistry

I need a website where you can get a natural resource map of India that displays which parts of india use which resource. Make sure the map has something to do with coal on it.

2007-12-19 09:49:35 · 4 answers · asked by simran936 2 in Geography

We did a lab about the enthalpy of the fusion of ice in chem 2 class where you add ice to water and watch the temperature change. data:
cup before 4.7 g, cup 1/3 full of water 180.5 g
the temperature started at 18 C and the final temp was 2 C

we need to calculate the heat lost, heat gained, heat of fusion, and the change in Hfus in kj/mol

would someone please help me figure out how to determine this assignment? thank you so much

2007-12-19 09:48:49 · 1 answers · asked by Anonymous in Chemistry

2007-12-19 09:48:36 · 1 answers · asked by African Princess 2 in Chemistry

Mangroves are an example of a submerged or emerged plant community?

2007-12-19 09:47:27 · 1 answers · asked by teacher1 2 in Earth Sciences & Geology

2007-12-19 09:45:50 · 4 answers · asked by loops 1 in Physics

2007-12-19 09:44:55 · 3 answers · asked by bmosby2 2 in Mathematics

I have an IPC (Integrated Physics and Chemistry) paper about rate of reaction between ascetic acid and calcium carbonate. I need a relevant but clever title. Basically it has to do with the reaction time between acid and different sizes of chalk dust. If you have an idea at all, please answer! Thanks ahead of time!

2007-12-19 09:43:34 · 7 answers · asked by ehsknights_cheer 3 in Chemistry

what's the domain and the range of the function?

2007-12-19 09:42:34 · 4 answers · asked by hmm 3 in Mathematics

2007-12-19 09:37:47 · 3 answers · asked by Pansy 4 in Medicine

Does anyone know how to derive expressions in terms of m, G, M, and x for the kinetic energy of a satellite and for the gravitational potential energy of a satellite?

2007-12-19 09:37:25 · 2 answers · asked by asianman 4 in Physics

I use to know this, but haven't done it in a long time and now forgot.

The problem:
Find the number of sides of a convex polygon if the measure of its interior angles have a sum of 32,040 degrees.

If you could explain it too, that would be great.

--THX!

2007-12-19 09:35:19 · 3 answers · asked by æ 1 in Mathematics

zinc that must react w/ an excess of nitric acid to form 87.3 g of ammonium nitrate.

2007-12-19 09:34:02 · 2 answers · asked by Anonymous in Chemistry

how might they do this

need helpp!!!!!!!!!!!! bad

2007-12-19 09:32:21 · 4 answers · asked by Anonymous in Chemistry

2007-12-19 09:31:07 · 6 answers · asked by loops 1 in Physics

need help with labs

2007-12-19 09:30:44 · 2 answers · asked by Anonymous in Chemistry