Science & Mathematics - 1 November 2007

if you have courage and a tight grip you can yank a tablecloth out from under the dishes on a table. What is the longest time in which the cloth can be pulled out so that a glass 6 inches from the edge comes to rest before falling off the table? Assume that the coefficient of friction of the glass sliding on the tablecloth or sliding on the tabletop is .5

2007-11-01 10:12:28 · 2 answers · asked by blugh 2 in Physics

My friend and I were wondering if someone with albinism can dye their hair, will the color hold?

2007-11-01 10:10:56 · 9 answers · asked by Eri 2 in Biology

2007-11-01 10:07:45 · 11 answers · asked by djquack12 1 in Engineering

2007-11-01 10:05:26 · 14 answers · asked by b m 1 in Mathematics

A weight of 1200 N rests on a lever at a point 0.50 m from a support . On the same side of the support, at a distance of 3.0 m from it, an upward force with magnitude F is applied. Neglect the weight of the board itself. If the system is in equilibrium, what is F?

2007-11-01 10:03:15 · 1 answers · asked by Anonymous in Physics

what is the probability of rolling a 5 on a # cube?(decimal form)

2007-11-01 10:02:04 · 21 answers · asked by ladybug101 1 in Mathematics

I know the area of a sphere is 4.pi.r.squared. I know this because my daughter's 7th grade math text says so. But how did the world of mathematics come up with that particular formula? How can we prove it, using fundamentals and logic. If the proof is too long to post, can you point me to a reference. Thanks in advance.

2007-11-01 09:58:59 · 5 answers · asked by I_like_math 1 in Mathematics

According to the mayan calendar the last day of earth is December 21, 2012. Is this true? What exactally will happen? Will the earth crash into the sun or something? scarry!!!

2007-11-01 09:55:45 · 11 answers · asked by cali gurl 3 in Astronomy & Space

0.419g of H2O. Determine the empirical formula of ethyl butyrate?

Need help.

2007-11-01 09:55:22 · 1 answers · asked by Anonymous in Chemistry

a river flows south at 3m/s and is 50 m wide. An intrepid beaver sets out from west shore, aiming himself directly east. He swims with velocity relative to the water of 2m/s, east.
how long to cross stream
velocity
how far downstream
how long to cross river when dam is broke and velocity is 25m/s

2007-11-01 09:54:35 · 2 answers · asked by Don 1 in Physics

6 gal 3 qt = _____qt _____lb = 64 oz 8 m = _______cm 3,080 mL = _______L

2007-11-01 09:52:04 · 1 answers · asked by palkia_8460 1 in Mathematics

2007-11-01 09:50:28 · 12 answers · asked by Sharon B 1 in Mathematics

I need to find out Chemical issues in the news please help??

2007-11-01 09:50:09 · 1 answers · asked by ? 4 in Chemistry

2007-11-01 09:49:35 · 4 answers · asked by Fung 1 in Chemistry

The volume of a gas at 273 degrees celcius is 200. liters. If the volume is decreased to 100. liters at constant pressure, what will be the new temperature of the gas?

please also show steps how to solve

2007-11-01 09:44:28 · 2 answers · asked by Mets Fan 1 in Chemistry

A 4.0 liter sample of oxygen has a pressure of 95 kPa. At a temp of 198 degrees celcius the same amount of has occupies 6.0 liters and has a pressure of 101 kPa. What was the original temp of the gas?

PLEASE HELP AND ALSO SHOW STEPS OF HOW TO SOLVE THIS.... thank you.

2007-11-01 09:42:13 · 1 answers · asked by Mets Fan 1 in Chemistry

If i have a question:
Design an 3 bit clocked up-down counter using
(i) D flip-flops
(ii) J-K flip-flops

what exactly do i have to do? I dont get it... do i need 3 inputs???

thnx so much

2007-11-01 09:41:14 · 3 answers · asked by Danielle 3 in Engineering

if you are swinging a string with washers tied to the end 2.0 meters off the floor with a motion that has a radius of 1.0 meters and a period of 1.5 econds, how far would the washers fly if the string broke?

2007-11-01 09:40:41 · 2 answers · asked by brubabe 5 in Physics

think of newtons laws...
1st. an object in motion stays in motion unless a net force is acted upon it.
2nd.F=MA
3rd. For every action there is an equal an opposite reaction
Think inertia...

2007-11-01 09:34:47 · 1 answers · asked by Anonymous in Physics

Can anyone give me a picture of the electron configuration of silicon? I'll choice the best answer and you'll get 10 points!

2007-11-01 09:33:59 · 3 answers · asked by ♥Over-Dramatic♥ 2 in Chemistry

Hi, I am having a really hard time with these problems. The static, kinetic, and coefficient are giving me the hard time. Someone help me plz! Thanks.

1. At a wedding receoption, you notice a small boy who looks like his mass is about 25kg running part way across the dance floor, then slidding on his knees until he stops. IF the kinetic coefficient of friction between the boy's pants and the floor is 0.15, what is the frictional force acting on him as he slides?

2. If you use a horizontal force of 30 N to slide a 12kg wooden crate across the floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?

3. A 225 kg crate is pushed horizontally w/ a force of 710N. If the coefficient of fricition is 0.20, calculate the accleration of the crate.

4. A force of 40.0 N accelerates a 5.0kg block at 6.0 m/s squared along a horizontal surface. How large is the frictional force and what is the coefficient of friction.

2007-11-01 09:31:49 · 1 answers · asked by Karl 1 in Physics

http://www.mathwarehouse.com/geometry/circle/images/two-secants/diagram-intersection-of-secants.gif

the circle and triangle look like that, only A and C are connected, and X and Z are connected. PS: dont pay attention to any of the letters or measurements other than A, C, X and Z. The X in the angle is also not there, but label the top of the triangle B.

Given: Secants BA, BCand XA is congruent to ZC.

Prove: triangle ABC is an isosceles traingle.

Please help!!!!!!!!!!!!!!!!

2007-11-01 09:31:38 · 1 answers · asked by Fuzzyglasses 3 in Mathematics

a teacher is loaded in a tank and fire at 53.1 degree angle hint (3,4,5) with speed of 100m/s. in flight he rises and fall back to a level 50 m below the height from which he started. ignore air resistance

2007-11-01 09:28:18 · 2 answers · asked by Don 1 in Physics

2007-11-01 09:25:37 · 7 answers · asked by b m 1 in Mathematics

2007-11-01 09:23:00 · 5 answers · asked by Hector the Trojan 2 in Astronomy & Space

A 58.2 kg sign is suspended by two wires, as the drawing shows. Find the tension in wire 1 and in wire 2.
http://www.webassign.net/CJ/4-58alt.gif

2007-11-01 09:18:05 · 3 answers · asked by Johnny Carson 2 in Physics

Which one is larger our galaxy or the galaxy in star wars series ?

2007-11-01 09:16:10 · 14 answers · asked by Hector the Trojan 2 in Astronomy & Space

2007-11-01 09:13:29 · 4 answers · asked by black moon 1 in Astronomy & Space

Be creative, no bad language; there's kids out there.

2007-11-01 09:12:38 · 4 answers · asked by "Johns" 7 in Weather

hunting, spray cans, mountain climbing, and skiing. At the same time, they greatly underestimate the risks of such hazards as x-rays, swimming, electric power, home appliances, and surgery. why should this be?

2007-11-01 09:12:03 · 2 answers · asked by oge 4 in Engineering