Science & Mathematics - 8 October 2007

Have no idea how to do this and have a test tomorrow. Any help appreciated. Any website's appreciated :D.

2007-10-08 06:16:51 · 5 answers · asked by JJ 1 in Mathematics

I am doing a science project a need some help!
First of all, I think a wild rose and a prickly rose is teh same thing. My teacher doesn't. Is it or is it not?

I cannot find (for either roses) what is the name of the founder. Yep we need to k now this. Any help appreciated thanks!

2007-10-08 06:15:20 · 4 answers · asked by Anonymous in Botany

Use the new identities to solve:

3 sec^2 x = 5 + tan x in the range -180 <= x <= 180

Cheers peeps =P

2007-10-08 06:08:30 · 2 answers · asked by Sean 3 in Mathematics

A person is walking and causes a mop to have two displacements. The first has a magnitude of 170 cm and makes an angle of 130 degrees with the positive x-axis. The resultant displacement has a magnitude of 173 cm and is directed at an angle of 17.7 degrees to the positive x-axis. How can I find the magnitude of the second displacement?

2007-10-08 06:07:53 · 2 answers · asked by tanya 1 in Physics

Consider
0 = c

This means:
- 0 = - c

But
- 0 = 0

Therefore c = - c

Isn't this in opposition with the law of non-contradiction which states that c = c ?

"One cannot say of something that it is and that it is not in the same respect and at the same time." Aristotle.

Should zero actually have a rational existence?

2007-10-08 06:07:03 · 5 answers · asked by Biob 1 in Mathematics

2007-10-08 06:05:12 · 1 answers · asked by Kelly 3 in Physics

Im just wondering I never really thought about it...

2007-10-08 06:04:06 · 6 answers · asked by Anonymous in Astronomy & Space

There is this unresolved question about the sequence of the evolution of the chicken and the egg, but what is really bothering me is about the gender. Did the male evolve before the female or was it the other way round? At what point did the male decide a female has to evolve or at what point did the female decide the male has to evolve?

2007-10-08 06:03:32 · 18 answers · asked by Optimist E 4 in Biology

2007-10-08 06:01:30 · 14 answers · asked by ladydamarys 1 in Astronomy & Space

what two shapes can be drawn on sphere that cant be drawn on a plane? what two shapes can be drawn on a sphere and a plane? help pleaseeeeee!

2007-10-08 06:00:37 · 2 answers · asked by Anonymous in Mathematics

PLEASE PLEASE PLEASE HELP me to do these PHYSICS questions, Thanks :)


1. a) If the KE of an arrow is quadrupled, by what factor has its speed increased?

b) If the speed is tripled, by what factor does its KE increase?

2. How much work must be done to stop a 1070 kg car traveling at 111 km/h?

3. One car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 5.5 m/s, they then have the same kinetic energy. What were the original speeds of the two cars?

first car=.....m/s
second car=.....m/s

2007-10-08 05:54:45 · 4 answers · asked by Nikita 1 in Physics

2007-10-08 05:54:29 · 11 answers · asked by Miriam R 2 in Mathematics

Lim [x + sin(x)] / [2x – 5sin(x)]
x→∞

I know what the answer is. I just want to know if L’Hopital’s rule can be used to find that limit. If not, why not; and if so, show me how.

2007-10-08 05:53:39 · 6 answers · asked by Dr D 7 in Mathematics

A square has corners ABCD labeled CW. Point P is randomly chosen on side AB, point Q is randomly chosen on side BC, and point R is randomly chosen on side CD.

Calculate the probability that angle PQR is obtuse.

2007-10-08 05:52:28 · 2 answers · asked by Dr D 7 in Mathematics

2007-10-08 05:48:41 · 2 answers · asked by Anonymous in Chemistry

2007-10-08 05:45:31 · 8 answers · asked by Smooth 1 in Chemistry

Is it possible that H4P2O7 (pyrophosphoric acid)can glow in the night? since it has P2 in the formula. Is it possible I can apply it on a paper and make the paper glow, or what should I do to make H4P2O7 glows in the night? like combine with other chemical, thanks!!

2007-10-08 05:45:04 · 1 answers · asked by H T 1 in Chemistry

im trying to find the best way to have light reflect off the parabola to get the best focal point i can

2007-10-08 05:44:15 · 3 answers · asked by Cody w 1 in Mathematics

I want to be an Engineer, I don't know what kind yet- but most likely a computer hardware engineer.

2007-10-08 05:43:49 · 12 answers · asked by 4evaluvmuzic 2 in Engineering

okay, I have to do 30 of these and I forgot me math spiral so zi forgot how to do these..... please don't just give me the answer, please show me how you got your answer. thank you.....
1) If something is $11.00 and it has a 20% discount what would you get. Then the same thing is 11.00 and the sales tax on it is 8.5% what would you get? And finally, what would be the final cost of the item?

2) Please do the same thing but the item is $4.75. It is with the same 20% dicount and 8.5% sales tax.

3) Last one is $14.00 and the 20% discount and the sales tax is 8.5%. Thank you!

2007-10-08 05:43:02 · 5 answers · asked by lover2 1 in Mathematics

A certain reaction is spontaneous at 69degC. The enthalpy change for the reaction is 12 kJ/mol. Convert the temperature to K and then enthalpy change to J/mol

2007-10-08 05:39:54 · 1 answers · asked by aaron a 1 in Chemistry

A Metabolic pathway is
a. a single, specific reation that starts with one compound and ends up with another.
b. a sequence of chemical reactions that aew part of the metabolic process.
c. a series of events that occur only in autotrophs.
d. all of the above


The "universal energy currency" of the cell is
a. O 2
b. C6 H12 O6
c. ATP
d. H2O

2007-10-08 05:39:48 · 5 answers · asked by Anonymous in Biology

How much heat is released when 10.3g of Cs2 and 10.3 g of Cl2 are mixed and react according to the following equation:

Cs2(g) + 3Cl2(g)---> S2Cl2(g) + Cl(2)(g) + CCl4(g)
delta H= -230 kJ/mol

2007-10-08 05:38:33 · 1 answers · asked by aaron a 1 in Chemistry

and why are fewer people left handed than right handed?

2007-10-08 05:36:50 · 4 answers · asked by undeadbeast12 1 in Biology

2007-10-08 05:36:06 · 2 answers · asked by shelbylynn8991 1 in Chemistry

2007-10-08 05:35:54 · 5 answers · asked by Anonymous in Astronomy & Space

Does the force that your hand exerts on the bag's handle do any work?Explain

2007-10-08 05:35:40 · 2 answers · asked by bc 1 in Physics

Do You ppl know?

2007-10-08 05:35:19 · 3 answers · asked by Lemon Magnet 1 in Weather

how do i determine the pH of a solution that is formed by mixing 50ml of .2835M HCl and 75ml of .2558M NaOH

2007-10-08 05:33:00 · 2 answers · asked by ajramos_03 2 in Chemistry

A) how much potential energy does that have after being lifted
B) it took 5 sec to lift the crate using machine what is the power rating of the machine

2007-10-08 05:31:57 · 1 answers · asked by km 2 in Engineering