Science & Mathematics - 18 September 2007

well, I'm sure the formula for finding the gravitational force is correct, if the radius is 0 the weight would ofcourse be undefined, then why is it 0 in all sources which I've read???

2007-09-18 06:04:46 · 2 answers · asked by Ice S 2 in Physics

2007-09-18 06:01:40 · 7 answers · asked by Anonymous in Chemistry

2007-09-18 06:00:11 · 3 answers · asked by Anonymous in Chemistry

How many mass molecules are there and how would i draw them (web link would be greatly appreciated)

2007-09-18 05:59:27 · 1 answers · asked by Anonymous in Chemistry

I have to compare modern methods of extracting iodine and chlorine. I know that chlorine is extracted by electrolysis and iodine is vapourised and condensed but what are the reasons for these particular methods relating to the chemistry of chlorine and iodine? any help would be greatly aprechiated and 10 points to the answer that helps me the most! thanks!

2007-09-18 05:58:42 · 1 answers · asked by jono 2 in Chemistry

Since light can not escape a blackhole, and light is the fastest thing in the universe. According to Einstein, time slows as we travel faster....would you actually travel back in time if you went through a black hole...or at least around the event horizon?

2007-09-18 05:56:43 · 5 answers · asked by Anonymous in Astronomy & Space

A house and lot valued at $ 55000 is being depreciated over 25 years by the straight-line method . After 18 years, the book value of the asset is $ 37000 . Since only the value of the house depreciates, find the assumed value of the land. (Ignore inflation.)
The assumed value of the land is $:

2007-09-18 05:56:41 · 3 answers · asked by Jay 1 in Mathematics

A set of crash tests consists of running a test car moving at a speed of 12.2 m/s (26.84 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 73 kg (160.6 lbs) dummy is found to move a distance of 0.69 m from the moment the car touches the wall to the time the car is stopped. Calculate the size of the average force which acts on the dummy during that time.

2007-09-18 05:51:27 · 2 answers · asked by Anonymous in Physics

a. congruent
b. vertical.
c. opposite
d. all of the above

2007-09-18 05:51:21 · 5 answers · asked by shoncapri 1 in Mathematics

2007-09-18 05:49:29 · 3 answers · asked by liana l 1 in Geography

what is the reciprocal of the following?
10
2/3
4/5
1/2

2007-09-18 05:44:42 · 7 answers · asked by Anonymous in Mathematics

A chain consisting of five links, each of mass 0.125 kg, is lifted vertically with a constant acceleration of a = 2.2 m/s2. Find the magnitude of the force that link 3 exerts on link 2.

I know the formula is F= M A

so F= 2.2 * 0.125 but what does it matter what link it is in the chain? and whats the magnitude?

2007-09-18 05:43:52 · 2 answers · asked by Anonymous in Physics

So.... if the universe is expanding is our world getting smaller cause we will be alone or it actually getting bigger?

2007-09-18 05:41:21 · 6 answers · asked by Lord NeXuS M00N 3 in Astronomy & Space

A particle of charge +13.2 µC and mass 7.64 x 10^-5 kg is released from rest in a region where there is a constant electric field of +397 N/C. What is the displacement of the particle after a time of 3.14 x 10^-2 s?

Please explain the solution, thanks!

2007-09-18 05:40:32 · 4 answers · asked by free f 1 in Physics

i am trying to figure it out, if you have the answer you get the 10 points.

2007-09-18 05:39:50 · 17 answers · asked by Anonymous in Mathematics

Evaluate the Triple Integral?

∫ ∫ ∫ z^2 dV
S

where S is the solid bounded by the cylinders x^2 + z =1 and y^2 +z =1 and the xy - plane.

2007-09-18 05:38:32 · 1 answers · asked by Anonymous in Mathematics

Two charges, -13 and +4.8 µC, are fixed in place and separated by 2.3 m. (a) At what spot along a line through the charges is the net electric field zero? Give the distance of the spot to the positive charge in meters (m). (Hint: The spot does not necessarily lie between the two charges.) (b) What would be the force on a charge of +14 µC placed at this spot?

2007-09-18 05:38:16 · 2 answers · asked by free f 1 in Physics

2007-09-18 05:38:10 · 7 answers · asked by BAL 5 in Astronomy & Space

Set up the iterated (triple) integrals that will solve for the volume of the solid.

----bounded by the cylinder y=x^2 +2 and the planes y=4, z=0 and 3y-4z=0.

2007-09-18 05:37:51 · 2 answers · asked by Anonymous in Mathematics

2007-09-18 05:36:56 · 2 answers · asked by Anonymous in Chemistry

Hypothetical element X has 3 stable isotopes. The relative peak intensities are 57.66 for 180.0 u, 100.0 for 184.0 u, and 84.10 for 186.0 u. What is the average atomic mass for X?

2007-09-18 05:35:03 · 3 answers · asked by Anonymous in Chemistry

Describe a simple process for using rates and unit prices that might help someone who is having difficulty understanding these concepts.
Include an example

2007-09-18 05:34:49 · 2 answers · asked by mae 1 in Mathematics

Question 1 (1 point)
Chlorine has two stable isotopes of mass 34.97 u and 36.97 u. Suppose the percent abundance of the lighter isotope were 64.75%. What would be the atomic mass of Cl? (The actual abundance is 75.77%.) I need the procces to get to the answer

2007-09-18 05:31:58 · 4 answers · asked by Anonymous in Chemistry

2007-09-18 05:30:32 · 3 answers · asked by Anonymous in Chemistry

2007-09-18 05:26:21 · 10 answers · asked by Anonymous in Mathematics

to learn

2007-09-18 05:25:20 · 3 answers · asked by Aishwarya s 2 in Engineering

E= element in set. e = subset of set
a.){x E Z : |x| <= 10}

b.){x E Z : 1 <= x^2 <= x}

c.){x E Z : x E empty set}

d.){x E Z : empty set E x}

e.){x E Z : empty set e {x}}

f.)2^[2^{1,2,3)]

g.){x E 2^{1,2,3,4} : |x|=1}

h.){{1,2}, {3,4,5}}

2007-09-18 05:25:15 · 2 answers · asked by aorick21 2 in Mathematics

a rubber ball was dropped from a height of 42m and each time it strikes the ground, it rebounds to a height of 2/3 of the distance from which it fell. find the total distance traveled by the ball before it comes to rest...step by step please...thanks

2007-09-18 05:24:00 · 5 answers · asked by kenn 2 in Mathematics

A ship sets out to sail to a point 210 km due north. An unexpected storm blows the ship to a point 110 km due east of its starting point. In what direction must it now sail to reach its original destination? ____________º (counterclockwise from east)

2007-09-18 05:23:46 · 2 answers · asked by sydkannon 1 in Physics

help i dont know any of this stuff

2007-09-18 05:22:25 · 6 answers · asked by Lisa 1 in Mathematics