Science & Mathematics - 2 October 2007

Im studying for a test tommorow in geometry. I have it all down pretty well. Except how do I double the size of an angle. only using a compass.

2007-10-02 13:06:50 · 1 answers · asked by Jackal115 5 in Mathematics

A die and a coin are tossed. Let A be the event that the die shows a 5 or a 6 and let B be the event that the coin shows heads.

A) Specify the sample space for the experiment

B) Specify the simple events in A, B, A union B, A intersection
B

C) Find the probability of A, B, A union B, A intersection B

D) Are A and B mutually exclusive? Are they independent?

2007-10-02 13:06:39 · 6 answers · asked by Anonymous in Mathematics

2007-10-02 13:05:51 · 3 answers · asked by DesiB 2 in Biology

A cylindrical concrete silo is 4 m in diameter and 33 m high. It consists of a 6000 kg concrete base and 38000 kg cylindrical concrete walls. Neglect the thickness of the silo walls and base.

(a) How high off the ground is the center of mass of the silo when it is empty?

(b) How high off the ground is the center of mass of the silo when it is two-thirds full of silage whose density is 820 kg/m3?

2007-10-02 13:03:32 · 1 answers · asked by Nathan R 1 in Physics

Which would have the lowest boiling point?
H2Te
H2O
H2S
H2Se
HI

I'm not sure how you find this so please explain

2007-10-02 13:01:26 · 1 answers · asked by Anonymous in Chemistry

2007-10-02 13:00:12 · 1 answers · asked by mserika 1 in Earth Sciences & Geology

I have to compute it using the telescoping sum; I know what the formula is but how would I compute it???

2007-10-02 12:58:18 · 1 answers · asked by Anonymous in Mathematics

One of the rules that won't change the value of a determinant of a matrix is: if we add to each element of one row, k times the corresponding element of another row, where k is ANY number (same statement applies to columns as well)(similar to row reduction, but applies to columns as well). I seem to be changng the value of the determinant by doing this... the first matrix i have(whose determinant is 0) is, 1st row: 0 -1 4, 2nd row: 1 0 -1, 3rd row: 4 1 0. I added -4 times the 2nd column to the first column(k= -4), and get, first row: 4 -1 4 , second row: 1 0 -1 , third row: 0 1 0. If u compute the determinant it is still zero! Now by using the above stated rule again, I add the 3rd column to the 1st column, (this theoretically should not change the value of the determinant, we take k=1), so the new matrix is, 1st row: 8 -1 4, 2nd row: 0 0 -1, 3rd row: 0 1 0. If we now solve for the determinant, we can see that it is 8. Why does this happen? It should still be zero!

2007-10-02 12:55:56 · 1 answers · asked by John 6 in Mathematics

2007-10-02 12:55:33 · 1 answers · asked by Anonymous in Engineering

a. find expressions for the velocity and acceleration of the moving body.

b. find the body's speed each time the acceleration is zero.

c. find the total distance traveled by the body from t=0 to t=2

Thank you very much.

2007-10-02 12:54:46 · 2 answers · asked by Anonymous in Physics

2007-10-02 12:54:08 · 1 answers · asked by carla f 1 in Mathematics

x=x no soloution, one soloution or many???

2007-10-02 12:54:06 · 4 answers · asked by isis r 1 in Mathematics

Please help me!!!!

2007-10-02 12:54:00 · 1 answers · asked by Anonymous in Engineering

soil
sugar water
alcohol
pure air

2007-10-02 12:53:20 · 4 answers · asked by Anonymous in Chemistry

(a) Is the point (11 14 17 18) on the line (1 2 3 4) + t (5 6 7 8)?
*they are all vertically arrange like this:
(11)
(14)
(17)
(18)

(b) Does the point (4 3 2 ) lie in the plane (1 2 3) + t(1 1 0) + s(0 1 1) ?
*they are also all vertically arrange like this:
(4)
(3)
(2)
Explain your answers.

2007-10-02 12:51:35 · 2 answers · asked by iznissin 1 in Mathematics

please explain to me about active and passive transport
i know passive transport is like high concentration to low concetration so it doesnt really require energy then theres diffusion, facilitated diffusion, and osmosis
for active trasnport theres like endocytosis and exocytosis but i dont understand the difference and what they are then endocytosis is split into pinocytosis and phagocytosis (which is like eating the cell??? please explain!!) thanks

2007-10-02 12:47:35 · 3 answers · asked by Anonymous 2 in Biology

2007-10-02 12:47:33 · 3 answers · asked by tmmz1107 2 in Chemistry

a) When is the particle moving to the right, when is it moving to the left?

b) Find the total distance traveled during the first 4 seconds

c) find the acceleration time at t. When is it 0?

d) When is the particle speeding up? When is it slowing down?


I have a few problems like this and any help that can be offered on any part is appreciated.

2007-10-02 12:47:06 · 3 answers · asked by ash 2 in Physics

2007-10-02 12:46:43 · 7 answers · asked by Anonymous in Mathematics

Please Help!

g - 2/5 = g + 4/7

Thanks

2007-10-02 12:44:23 · 3 answers · asked by jhkbbuoo 1 in Physics

Here is it scanned.

http://s107.photobucket.com/albums/m316/myrainien/?action=view¤t=IMAGE12.jpg

2007-10-02 12:43:08 · 1 answers · asked by Phil 2 in Physics

2007-10-02 12:42:45 · 8 answers · asked by lleohm 1 in Astronomy & Space

2007-10-02 12:42:18 · 2 answers · asked by Hot Coco Puff 7 in Weather

If 70.0 mL of 0.150 M CaCl2 is added to 35.0 mL of 0.100 M AgNO3, what is the mass in grams of AgCl precipitate

2007-10-02 12:42:10 · 1 answers · asked by ws 3 in Chemistry

Im suppose to use a counterexample to show that DIVISION IS NOT commutative ( the property)

2007-10-02 12:41:33 · 4 answers · asked by Bluekygrrl 2 in Mathematics

What numbers have 5 factors,3 factors and 9 factors.
Fastest and Correct & Detailed answer wins for best answer.

2007-10-02 12:40:40 · 1 answers · asked by Natty 2 in Mathematics

In math, when you divide fractions, why do you always have to invert the divisor? I know because it is a rule and if you don't your problem will turn out wrong: but why?
If you know that's really great because I'm really curious. Thank You!

2007-10-02 12:38:01 · 9 answers · asked by Chicken Girl 5 in Mathematics

One has the velocity components Vx=1.0 m/s , Vy= 2.0m/s
The other has the velocity comp. Vx=2.0m/s , Vy= 3.0 m/s .
If both balls started from the same point , what is the angle between their paths?

2007-10-02 12:37:01 · 2 answers · asked by salvatore g 1 in Physics

What is his acceleration on earth?
What is his mass on earth?
Mass on Jupiter?
Weight on Jupiter g = 2.64 x gravity of earth?
Weight on moon gravity is 1/6 of earth?
Mass on moon?
Mass as hes floating through space?
Weight as floating through space?

2007-10-02 12:36:25 · 1 answers · asked by gullivergraveler 1 in Physics

I am working on a robot with a club; one of our best ideas involves using tank like tracks instead of normal wheels. We don't want to waist a huge amount of money on these but we want descent quality. Does anyone have any idea where we could purchase these?

2007-10-02 12:35:09 · 3 answers · asked by James L 2 in Engineering