Science & Mathematics - 13 November 2007

2007-11-13 13:36:07 · 4 answers · asked by ashu 1 in Physics

does anyone know the specific heat for gold?

2007-11-13 13:35:30 · 2 answers · asked by ILJB4L!! <3 1 in Chemistry

Let A be a set containing 23 elements and B a set containing 13 elements.
(a) How many functions are there from A to B?
(b) How many injective functions from A to B?
(c) How many surjective functions from A to B?

2007-11-13 13:34:40 · 1 answers · asked by iiro00292 2 in Mathematics

There is a biker riding constant velocity at k m/s the distance is traveled in t seconds given by the function d(t)=kt. There is a support car that starts when it passed and catches up so when it does it is traveling at the same speed its function is given by s(t)=6t^2-t^3. When the car catches up it immediately slows down. I've figured k=8m/s and t=2sec.

Suppose the biker is riding at a constant velocity (v) which can be different then k.

What is the expression that gives the time or times the car and the bike meet in terms of v?

2007-11-13 13:34:39 · 1 answers · asked by dcwest20 1 in Physics

A long jump shot is released 2.1 m above the ground, 5.96 m from the base of the basket, which is 3.05 m high. For launch angles of 30° and 60°, find the speed needed to make the basket.

2007-11-13 13:34:25 · 1 answers · asked by lamz 1 in Physics

okay
Write the expression for the verbal phrase.
the sum of a number and negative 5.
a number deacreased by 11
the product of 15 and a number
20 divided by a number
twice a number increased by seven
the qoutient of a number and 10
3 times the number and negative six

2007-11-13 13:34:22 · 5 answers · asked by Anonymous in Mathematics

2007-11-13 13:34:15 · 2 answers · asked by Anita 5 in Chemistry

a satellite of the earth has a mass of 100kg and its altitude of 2,000,000 m what is the potential energy of the satellite-earth system?
what is the magnitude of the gravitational force exerted by the earth on the satellite and what is the gravitational force does the satelite exert on the earth?

2007-11-13 13:33:53 · 1 answers · asked by Anonymous in Physics

How high does a rocket have to go above the
Earth's surface so that its weight is reduced
to 73.2% of its weight at the Earth's sur-
face? The radius of the Earth is 6380 km
and the universal gravitational constant is
6.67e-11 N *m^2/kg^2. Answer in units of
km.

2007-11-13 13:32:24 · 1 answers · asked by Anonymous in Physics

2007-11-13 13:30:57 · 14 answers · asked by shingan_mousou 3 in Zoology

I am doing a nutrition project...and it asked us to calculate our estimated KCal needs....doing that...i got 2339...

my actual intake is... 2043.8... the question is....if i continue to consume less KCal than needed, what would be the result? less energy? im not quite sure... help please :)

2007-11-13 13:30:45 · 1 answers · asked by Anonymous in Biology

I'm looking for individual opinions.

2007-11-13 13:30:38 · 7 answers · asked by Anthony A 1 in Other - Science

(e^4)^x (times) e^x^2 = e^12

e to the fourth power x times e power x squared equals e to the 12 power.

Thank You

2007-11-13 13:29:00 · 1 answers · asked by John 1 in Mathematics

somthing in science...please help!!

2007-11-13 13:28:29 · 2 answers · asked by YOYOYO 1 in Earth Sciences & Geology

Compare the three types of bonds, ionic bond, metallic bond, and covalent bond based on what happens to the valence electrons of the atoms.

Please help!

2007-11-13 13:27:29 · 3 answers · asked by ladyitalkalot 1 in Chemistry

how do they affect DNA and RNA replication, how do we know which is which?

2007-11-13 13:26:46 · 0 answers · asked by Anonymous in Biology

Can a compound be seperated by heating?

2007-11-13 13:26:42 · 5 answers · asked by Addicted To Abercrombie & Fitch 2 in Chemistry

A. they are rearranged to form hydrogen and oxygen gas.
B.they are destroyed.
C. they increase in size until they form a solid.
D.they combine with oxygen in air to produce new substances

thanks in advance...

2007-11-13 13:25:26 · 4 answers · asked by Brandy boy 2 in Chemistry

2007-11-13 13:25:05 · 3 answers · asked by ashu 1 in Physics

What if there were an elevator that stretched from Earth's surface up and through the atmosphere??
The elevator would end 66,000 miles above earth,scientists are studying how to build a structure like this?
did you know that??? that would be so cool.

2007-11-13 13:24:12 · 19 answers · asked by JHardy54 4 in Astronomy & Space

what is this compound...PI5 ...this is Phosphorus with five iodine...im not sure what the answer should be...pls help!

2007-11-13 13:22:21 · 1 answers · asked by roxie 2 in Chemistry

#1. A parallel plate capacitor of capacitance C sub zero has plates of area A with separation d between them. When it is connected to a battery of voltage Vsub0, it has charge of magnitude Qsub0 on its plates. The plates are pulled apart to a sepatation 2d while the capacitor remains connected to the battery. After the plates are 2d apart, what is the magnitude of the charge on the plates and the potential difference between them?
#2. A proton with a charge +e is moving with a speed v @ 50degrees to the direction of magnetic field B. The component of the resulting force on the proton is the direction of B is?
#3. In a loop in a closed circuit, the sum of the current entering a junction equals the sum if the currents leaving a junction because??
#4. Two wires of the same material with the same lenght have differenct diameters. Wire A has twice the diameter of wire B. If the resistance of wire B is R, then that is the resistance of wire A?

2007-11-13 13:22:18 · 1 answers · asked by none 1 in Physics

chemistry. cant find answer. NEED HELP!!!!!!!!!!!!!!! due tonight!!!!

2007-11-13 13:22:08 · 4 answers · asked by Anonymous in Chemistry

i have to calculate the % change from:
$800 to $1,200
and then from $800 to %1,800.
how do i do that?

2007-11-13 13:21:36 · 18 answers · asked by Anonymous in Mathematics

I was on Yahoo yesterday and there was this clip leading to a website where you could hear recordings of weird space noises from Probes, but when i was searching today i couldnt find it again... does anyone know where i can find it??

2007-11-13 13:21:14 · 2 answers · asked by blondy24 2 in Astronomy & Space

What is the least active nonmetal in period 6?
Most active family of nonmetals?
Most active metal?
Most common isotope of calcium?
Whats an ionization (oxidation) number?
I've tried to find this info in my notes, but I can't. If anyone can help with any of these i would really appreciate it. Thank y'all.

2007-11-13 13:20:13 · 1 answers · asked by Anonymous in Chemistry

how do spruce trees use other things (nonliving and living)

Would an answer be that it uses light, soil, water, and carbon dioxide?

What eat beetles?
and
What is the Beetles habitat?

Is the answer that they live in mostly all habitats exept in the sea and polar regions?

2007-11-13 13:20:04 · 2 answers · asked by shinigami100 1 in Biology

One part of me wants to be a normal person and be in a normal job like teacher ,doctor ,engineer,lawyer etc.... but I also have a part called the risk side of me I really want to go to college for things I can use and my heart is in plants and animals but I dont want to be a farmer or zookeeper if I do go to college for zoology botany or biology what can I do with it(People at school think Im weird because Im interested in things like botany but its fun to me ( I live in the city and I have no clue where people like me fit)

2007-11-13 13:18:17 · 1 answers · asked by Anonymous in Biology

Alright, i have a project due tomorrow, and i need your help..

Aluminum Chloride (AlCl3)
I'm trying to make this into a Lewis Structure, but I'm not sure if im right or not..this is what i have so far..
. . . .
: CL = Al - CL:
| . .
. .
: CL:
. .

So im saying that Cl in the left, has a double bond, while the rest of the Cl have single bonds..

Cl has 7 electrons around it and Al has 3 electrons

Hope you can bare with me, i'm so confused, and hope you guys can help me out..

2007-11-13 13:16:51 · 2 answers · asked by Oliver B 2 in Chemistry

Does this depend on denominator or numerator?

2007-11-13 13:14:34 · 3 answers · asked by xboxturbo 3 in Mathematics