Science & Mathematics - 25 October 2006

for example:

Given the vectors
A = 2i - 3j and B = 4j - 5k, calculate A x B

please help me, thanks

2006-10-25 18:32:23 · 1 answers · asked by Anonymous in Physics

show 1 = 2 any how.

2006-10-25 18:29:22 · 14 answers · asked by Anonymous in Mathematics

i m a physiotherapy student....so i need a note or a website ac. to my course

2006-10-25 18:27:24 · 0 answers · asked by sheet 1 in Other - Science

What stage of the cell cycle

2006-10-25 18:26:52 · 6 answers · asked by Anonymous in Biology

2006-10-25 18:26:41 · 9 answers · asked by Anonymous in Medicine

This is an actual question and not a joke so can anyone answer seriously?

2006-10-25 18:22:42 · 4 answers · asked by monkey_^^ 1 in Biology

What does it do? I'm studying immunology.

2006-10-25 18:20:18 · 1 answers · asked by retzy 4 in Biology

2006-10-25 18:18:53 · 7 answers · asked by Anonymous in Mathematics

2006-10-25 18:16:36 · 3 answers · asked by monkey_^^ 1 in Biology

2006-10-25 18:08:18 · 6 answers · asked by js15552003 1 in Botany

2006-10-25 18:07:06 · 20 answers · asked by viddu 2 in Weather

It took the braking force of 1000 Newtons a distance of 50 meters to stop a car. What was the kinetic energy of the car before the braking was started?
Explain answer please.

2006-10-25 18:03:02 · 6 answers · asked by ??? 2 in Physics

Am object with weight W is dragged along a horizontal plane by a force acting along a rope attached to the object. If the rope makes an angle of θ with the plane, the thmagnitude of the force is
F= μW/(μsinθ+cosθ)
where μ is a positive constant called the coefficient of friction and where 0 is less than or equal to θ and θ is less than or equal to (pi/2). Show that F is minimized when tanθ=μ.

2006-10-25 17:58:21 · 2 answers · asked by Anonymous in Mathematics

2006-10-25 17:58:17 · 9 answers · asked by Bev 3 in Mathematics

2006-10-25 17:54:49 · 7 answers · asked by prasad 1 in Mathematics

2006-10-25 17:53:35 · 5 answers · asked by lil_angel 2 in Zoology

please show your work. i will choose the best explanation as the best answer

2006-10-25 17:52:12 · 5 answers · asked by I Like Cheese 2 in Mathematics

Is one trillion equal to 10 to the 12th or 1000 billion? I always thought it was 1000 billion.

2006-10-25 17:47:55 · 15 answers · asked by crazy4nostalgia 2 in Mathematics

y^5 - 6y^4
i found none however i put it in this equation:

y^5 - 6y^4= (y^5)*(1) - (2y^2)*(3y^2).... am i right plz help me

2006-10-25 17:36:45 · 8 answers · asked by unique 2 in Mathematics

Hi. I need to solve this problem, but I cannot figure out what formula to use to solve it.

John drove to Seattle from Tacoma at an average speed of 60mph. On the way back, he drove at 50mph. The total trip took 4.4 hours. What is the distance between the 2 cities?

Thanks for your help! :)

2006-10-25 17:35:59 · 4 answers · asked by Joel M 1 in Mathematics

I need to find the mass of Neptune and I have this data:

Planet Neptune , at closest approach , is about 29.1AU from Earth.
At that distance, Neptunes Angular Diameter is 2.3"
It's moon Triton moves in a circular orbit with an angular dimater of 33.6"
abd a period of 5.9 days.

So I know to use a modified version of Keplers law to get the mass but the
Angular diameters are setting me off...I don't know how they fit in!
Please help me!

2006-10-25 17:35:31 · 2 answers · asked by Anonymous in Astronomy & Space

Try to figure out the number.
It is : a 4 didgit whole number
divisible by 11,13,4,and 9
sum of digits is 12

2006-10-25 17:35:04 · 11 answers · asked by Anonymous in Mathematics

If you follow the equation, it always knows what you're thinking. http://www.tekzoned.com/games/psychic/index.html
I've tried to figure it out because there has to be some kind of trick to it? is it obvious and ijust don't see

2006-10-25 17:30:34 · 7 answers · asked by Crimson 2 in Mathematics

I see on an up-to-date map that Canada is now divided into states - it looks like about nine of them. They used to be one big area. Do they have to copy the USA in everything?

2006-10-25 17:25:07 · 20 answers · asked by Anonymous in Geography

my boyfriend and i have a bet going that kangaroos don't have whiskers. please help

2006-10-25 17:23:40 · 10 answers · asked by Anonymous in Zoology

this isnt homework but its a problem ive always had a thing with :

what is the total surface area of a box whos dimensions are 2b x b x b?

2006-10-25 17:22:52 · 9 answers · asked by Anonymous in Mathematics

Calculate the number of years for an investment of $1000 to double at an interest rate of 7.2% for each compounding period.
a) annually
b) semi-annually

... plz show all steps and the formula ... thnku =)

2006-10-25 17:22:30 · 2 answers · asked by Meh... 3 in Mathematics

Does DEAD + 1 = 313?

(DxE)+(AxD) right?

Its from the riddle from:
http://www.thinkgeek.com/tshirts/frustrations/6596/

2006-10-25 17:22:03 · 4 answers · asked by Joe 4 in Mathematics

Why for diff equation is e^(alpha*x) substituted say for

d2y/dx2 - ky(x) = 0
say K = 4
d2y/dx2 - 4y(x) = 0

y(x) = e^(alpha*x)

substituting e^(alpha*x) we find
(alpha^2 -4)y(x) = 0
alpha = +/- 2

How does this work?

2006-10-25 17:21:29 · 4 answers · asked by nathaniel49 2 in Mathematics

Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.200 m which is used to draw water from a well. A bucket of mass m = 1.50 kg is attached to a massless cord wrapped around the pulley. The bucket starts from rest at the top of the well and falls for t = 3.00 s before hitting the water h = 9.99 m below the top of the well.

(i) What is the angular velocity of the pulley when the bucket hits the water? (use the relation between the angular velocity and the linear velocity)

(j) What is the angular momentum of the pulley when the bucket hits the water? (use the moment of inertia and the angular velocity of the pulley)

(k) What is the kinetic energy of the bucket when it hits the water?

(l) What is the kinetic energy of the pulley when the bucket hits the water?

(m) What is the total kinetic energy of the system when the bucket hits the water?

Is the total kinetic energy smaller, equal to (within +/- 1%), or larger than the potential energy change?

2006-10-25 17:16:49 · 2 answers · asked by Anonymous in Physics