Science & Mathematics - 26 September 2007

2007-09-26 10:02:25 · 1 answers · asked by Ronnie 2 in Earth Sciences & Geology

2007-09-26 10:01:17 · 9 answers · asked by Darlingthatsfabulous 1 in Biology

2007-09-26 10:00:36 · 1 answers · asked by Lila S 1 in Biology

how to find the domain for radical equations?
how to find the domain for rational equations?

2007-09-26 09:56:56 · 2 answers · asked by phresh 1 in Mathematics

A patient receives iodine-131 as a medical treatment on Monday, Sept. 11 at 11:00 am. On what date will only 1/4 of the original sample still be radioactive?
and can someone explain too...thanx =D

2007-09-26 09:56:36 · 5 answers · asked by brownies<33 2 in Chemistry

2007-09-26 09:55:12 · 4 answers · asked by Tim 6 in Zoology

please give details on how to solve for the answer.

2007-09-26 09:53:32 · 4 answers · asked by Doubledog 1 in Mathematics

underground and How and when was the hill formed as a Human face and Pyramids identical to Earth's?

2007-09-26 09:52:54 · 6 answers · asked by do_r_do_5 1 in Astronomy & Space

Y2 Y1 X Y2(t+1) Y1(t+1) JK1 JK2
0 0 0 0 1 1 d
0 0 1 0 0 0 d
0 1 1 1 1
0 1 0 0 1
1 1 0 1 0
1 1 1 0 0
1 0 1 0 0
1 0 0 0 1

2007-09-26 09:51:54 · 2 answers · asked by t k 1 in Engineering

2007-09-26 09:51:09 · 2 answers · asked by maricelasllr 1 in Biology

2007-09-26 09:51:05 · 12 answers · asked by Anonymous in Astronomy & Space

2007-09-26 09:50:39 · 4 answers · asked by Andrew 2 in Earth Sciences & Geology

A student standing on a platform at a railway station notices that the first two carriages of an arriving train pass him in 2.0s and the next two in 2.4s. The train is decelerating uniformly. Each cariage is 20m long. When the train stops, the student is opposite the last carriage. How many carriages are there in the train?

2007-09-26 09:49:07 · 7 answers · asked by hornets212121 1 in Physics

PLEASE EXPLAIN/ SHOW WORK!!!
1. A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 1.36 s after the stone is dropped. How deep is the hole? (m)

2. A stone is dropped into a river from a bridge 120 ft above the water. Another stone is thrown vertically down 1.00 s after the first is dropped. Both stones strike the water at the same time.
(a) What was the initial speed of the second stone? (ft/s)

3. To stop a car, first you require a certain reaction time to begin braking. Then the car slows down at a constant rate. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 79.0 km/h, and 24.4 m when the initial speed is 46.8 km/h.
(a) What is your reaction time?
(b) What is the magnitude of the deceleration?

2007-09-26 09:47:21 · 1 answers · asked by Anonymous in Physics

2007-09-26 09:44:17 · 5 answers · asked by Tpunk 2 in Weather

2007-09-26 09:41:44 · 7 answers · asked by Jen 2 in Geography

basically the space between objects is a void of nothingness apart from dense regions such as nebulae and possibly asteroid belts, but even still, unless your touching an object there is still a vacuum. what im wondering is that although the shaded space is about 280 C below zero, if there is no particles for heat to travel through, why does the coldness of space suck the heat out of the human body? what object is the heat being absorbed by? dark matter?

2007-09-26 09:41:40 · 10 answers · asked by Anonymous in Astronomy & Space

We live on a lump of rock travelling through space at 60,000 miles an hour, tied to a giant ball of fire with an invisble string. How can we expect anything to be logical?

2007-09-26 09:39:48 · 20 answers · asked by Uchimataman 1 in Physics

ablock of mass 25 kg slides down a frictionless surface inclined at 30 degree. to ensure that the block does not accelerate, what is the smallest force that you must exert on it and what its direction??

Please help me with this and i will really appreciate it.

2007-09-26 09:39:24 · 2 answers · asked by hahahaha 2 in Physics

Identify oxidizing agent, reducing agent, the substance being oxidized, and the substance being reduced. Explain.

a) HCl (g) + NH3 (g) ---> NH4Cl (s)

b) SiCl4 (l) + 2 H2O (l) ---> 4 HCl (aq) + SiO2 (s)

Thank you!

2007-09-26 09:38:04 · 1 answers · asked by Anonymous in Chemistry

Hi, I need help with my math homework. I have done most of them, but there are three i cannot figure out. Please help me.

1) 0.39s + 4.30 = 13.66

For these two i only need the equation-
2) A team won eight games more than they lost, and there were no ties. If the team played 78 games, how many games did they loose?

3) On a bus tour, there are 100 passengers on three buses. Two of the buses each carry four fewer passengers than the third bus. How many passengers are on each bus?

Thanks allot!!!

2007-09-26 09:37:41 · 6 answers · asked by Anonymous in Mathematics

I guess echo location wouldn't work in space then right?

2007-09-26 09:34:32 · 8 answers · asked by Anonymous in Astronomy & Space

2007-09-26 09:33:39 · 5 answers · asked by Anonymous in Astronomy & Space

2007-09-26 09:33:34 · 4 answers · asked by XoSexierDenYewXo 1 in Chemistry

2007-09-26 09:33:01 · 15 answers · asked by charles m 1 in Astronomy & Space

Since time is not an absolute, without motion or physical body can time travel only exist in human thoughts?

2007-09-26 09:32:56 · 2 answers · asked by edubya 5 in Physics

-4/9(2x-4)=48

i am hopeless at math...

2007-09-26 09:31:20 · 4 answers · asked by Anonymous in Mathematics

can u please explaine how u get ther answer

2007-09-26 09:31:02 · 2 answers · asked by Doubledog 1 in Physics

2007-09-26 09:30:28 · 4 answers · asked by abraymond5 1 in Mathematics

2007-09-26 09:29:53 · 6 answers · asked by papabura 2 in Mathematics