Science & Mathematics - 11 December 2007

Gravitational forces act between any two bodies in the universe as Newton stated but what really causes this force ?

2007-12-11 16:46:25 · 19 answers · asked by Bla Bla Y 1 in Astronomy & Space

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I Need Help Please Thank You For You Help

2007-12-11 16:45:16 · 2 answers · asked by Kim S 1 in Mathematics

1. What characteristics does sodium chloride have?

2.Sodium chloride is made up of sodium and chlorine, but it isn't a poisonous gas and it doesn't explode in water. Explain why.

2007-12-11 16:42:19 · 13 answers · asked by Anonymous in Other - Science

A 13 gram bullet is stopped in a 6.38 kg block of wood. The speed of the bullet-plus-wood combination immediately after the collision is 0.593 m/s.

What was the original speed of the bullet in m/s?

2007-12-11 16:39:48 · 4 answers · asked by margarita_9902@sbcglobal.net 2 in Physics

2007-12-11 16:33:11 · 8 answers · asked by shencock 1 in Mathematics

so i have an ontuse triangle with a perimeter of 3 1/4 what are the lenght of the 3 sides??

i have 3 squares, square one has a perimeter of 4 1/2 inches ,square two has a perimeter of 5 1/2 inches, square three has a perimeter of 6 inches. What are the lenghts???

2007-12-11 16:32:29 · 2 answers · asked by star 2 in Mathematics

The new EV-1 electric car makes use of storage batteries as its source of energy. Its mass is 1300 kg and it is powered by 26 batteries, each 12 V, 52 A•h. assume that the car is driven on the level at an average speed of 40 km/hr and the average friction force is 240 N. Assume 100% efficiency and neglect energy used for acceleration. Note that no energy is consumed when the vehicle is stopped since the engine doesn’t need to idle.
(a) Determine the horsepower required.
(b) After approximately how many kilometers must the batteries be recharged?

2007-12-11 16:28:54 · 1 answers · asked by Anonymous in Physics

How is f(x)=Arctan 8/x^2 done?????????

2007-12-11 16:28:03 · 3 answers · asked by xXPrincessXx 3 in Mathematics

A 2.26 kg book is dropped from a height of 1.5m.
a.What is it accelaraton?
b. What is its weight in newtons?
PLEASE SHOW STEPS FOR ME TO UNDERSTAND.THANK YOU.:)

2007-12-11 16:25:53 · 3 answers · asked by name 2 in Physics

Would it look like what they call a "Shadow Person"...or like a real person or like an angel???
Also..do they wear modern clothes...or robes...or clothes from olden days? Are they spirits of people who died?

2007-12-11 16:22:21 · 17 answers · asked by Deenie 6 in Paranormal Phenomena

where can i find phenomenon cap images with criss angel and uri geller

2007-12-11 16:22:17 · 1 answers · asked by Christan H 1 in Paranormal Phenomena

(a) What is its displacement in radians in this time?
(b) What is its average rotational velocity in rad/s?

2007-12-11 16:20:59 · 3 answers · asked by shamsan_415 1 in Physics

It can take brilliant pictures of nebulas, supernovas, and galaxies many light years from us, but cannot take a proper picture of Pluto, which is about 5.8 billion miles from earth. Is there a certain reason?

2007-12-11 16:18:48 · 11 answers · asked by *Tessie* 3 in Astronomy & Space

2007-12-11 16:18:41 · 7 answers · asked by Maple Sugar 4 in Astronomy & Space

412 base 5 - (minus) 33 base 5

2007-12-11 16:14:23 · 3 answers · asked by Fresh2Death 2 in Mathematics

A 21.0 g marble sliding to the right at 21.1 cm/s overtakes and collides elastically with a 8.8 g marble moving in the same direction at 13.9 cm/s. After the collision, the 8.8 g marble moves to the right at 16.4 cm/s. Find the velocity of the 21.0 g marble after the collision.

2007-12-11 16:13:08 · 2 answers · asked by Kecin S 1 in Physics

A 2200 kg car traveling at 11.4 m/s collides with a 2680 kg car that is initially at rest at the stoplight. The cars stick together and move 2.60 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that the negative acceleration is constant and that all wheels on both cars lock at the time of impact.

2007-12-11 16:12:30 · 1 answers · asked by Kecin S 1 in Physics

A 5.1 g coin sliding to the right at 26.4 cm/s makes an elastic head-on collison with a 15.5 g coin that is initially at rest. After the collision, the 5.1 g coin moves to the left at 10.2 cm/s.

(a) Find the final velocity of the other coin.

(b) Find the amount of kinetic energy transferred to the 15.5 g coin.

2007-12-11 16:11:40 · 1 answers · asked by Kecin S 1 in Physics

for a given omega, show that the position (or the envelope of the position) goes to zero quickest for a critically damped harmonic oscillator.

2007-12-11 16:10:32 · 2 answers · asked by Johnny 1 in Physics

Explain what the neretic zone. __________________________________

In what zone of the ocean do barnicals and seaweed live? __________________________________

In what zone of the ocean can photosynthesis not take place?
__________________________________

What name is given to a coastal ecosystem where fresh andsalt water come together?
__________________________________

what is succession?
__________________________________

What is the difference between primary and secondary succession?
__________________________________

Define the following:

Climax Community

Climate

Permafrost

Humus

2007-12-11 16:09:44 · 5 answers · asked by caroline123 1 in Botany

list that has the formula, picture of the formula from 1 to 10, that is all, much appreciated

2007-12-11 16:06:42 · 2 answers · asked by thewillprince 2 in Chemistry

where can i find screencaps of the show phenomenon with criss angel and uri geller

2007-12-11 16:06:40 · 2 answers · asked by Christan H 1 in Paranormal Phenomena

and stays there and grows until its full development to about 1 cm and comes out of the skin and falls to the ground?

2007-12-11 16:02:02 · 8 answers · asked by Regenerit 2 in Zoology

i graphed it and saw there was no intersection so not really sure what to do

2007-12-11 16:01:58 · 4 answers · asked by jaja_juice 1 in Mathematics

2007-12-11 15:57:09 · 2 answers · asked by Anonymous in Biology

A person has taken four test so far in a class. On the first two test which are worth 20 percent, she got a 69, and a 73. On the third which is worth 25 percent she got an 84. The fourth test is also worth 25 percent, but what grade does that person need for their whole class average to be a 85?

Assume that the last 10 percent is given.

2007-12-11 15:52:12 · 4 answers · asked by smiles 2 in Mathematics

2007-12-11 15:47:19 · 7 answers · asked by SUMMER 1 in Engineering

2007-12-11 15:40:10 · 3 answers · asked by dshariff 1 in Chemistry

2007-12-11 15:38:30 · 5 answers · asked by Amanda K 1 in Biology

a. gas exchange
b. feeding
c. water elimination
d. both feeding and gas exchange
e. all of these

2007-12-11 15:36:02 · 3 answers · asked by brian 2 in Biology