Science & Mathematics - 2 December 2007

A puck of mass 86.7 g and radius 3.73 cm slides along an air table at a speed of v = 1.53 m/s, It makes a glancing collision with a second puck of radius 5.12 cm and mass 120 g (initially at rest) such that their rims just touch. The pucks stick together and spin after the collision (b). The angular momentum of the system relative to the center of mass is 6.82e-03 kg*m^2/s.

I know that you have to use w=L/I i know you find the inertia for both pucks and i sort of know but i'm missing somethign the center mass is confusing me.

i found the center mass by doing(r1+r2)*m1/(m1+m2) but how do i put that in Inertia formula

any help is appreciated thanks in advance

2007-12-02 19:09:57 · 1 answers · asked by c c 2 in Physics

A 75kg bobsled is pushed along a horizontal surface by two athletes. After the bobsled is pushes a distance of 4.5m starting from rest, its speed is 6.0m/s. Find the magnitudes of the net force on the bobsled.

2007-12-02 19:04:25 · 3 answers · asked by Belinda A. 1 in Physics

Q2.solve the equation tanθ + tan(θ + pi/3) + tan(θ + 2pi/3) = 3

2007-12-02 18:59:53 · 2 answers · asked by ksh_great 1 in Mathematics

mean value theorum formula

f*(c) = (f(b)-f(a)) / b-a

2007-12-02 18:58:55 · 1 answers · asked by Jack 1 in Mathematics

2007-12-02 18:57:12 · 6 answers · asked by daniel w 1 in Earth Sciences & Geology

do they actually connect countries with countries physically? or is it only in the middle or something and it links the countries with signals?

2007-12-02 18:54:22 · 1 answers · asked by Q 2 in Engineering

Discounting "temporary" effects of ice caps forming and melting through the ice ages and warmer periods, why aren't oceans getting saltier? Is there a meganism that takes salt from the ocean and return it to land? Or are the oceans getting saltier in the long term?

2007-12-02 18:51:22 · 2 answers · asked by kwaaikat 5 in Earth Sciences & Geology

2007-12-02 18:46:04 · 3 answers · asked by meiscass 1 in Medicine

what is the whole significance of circumsition? what is being cut exactly? is it the prepuce part of the penis gland? Its amazing on how doctors can measure this skin at such an early age like newborn..i mean..how far do they cut?

2007-12-02 18:44:28 · 7 answers · asked by ALLELI 2 in Biology

Hi, working through a homework problem but I can't seem to get the answer to this one:

A steel gas tank of volume 0.0700 meters cubed is filled to the top with gasoline at 20 degrees celsius. The tank is placed inside a chamber with an interior temperature of 50 degrees celsius. The coefficient of linear expansion of steel is 12.0*10^-6 and the coefficient of volume expansion for gasoline is 9.50*10^-4 After the tank and its contents reach thermal equilibrium with the interior of the chamber, how much gasoline has spilled?

Any explanation of how to do this problem would be greatly appreciated!

2007-12-02 18:38:28 · 4 answers · asked by doubtful 2 in Physics

If sec4x - sec2x = 2, Find cos^2(x) [0 <= x <= π/2]

2007-12-02 18:37:29 · 1 answers · asked by Anonymous in Mathematics

This one seems easy...but I don't think I'm coming up with something solid enough for an official, well-explained proof:

Provide a Counterexample: Every rational number is equal to the product of two irrational numbers

How would you guys go about this seemingly easy counterexample-proof? You obviously can't just say 2*1 = 2 claiming 2 is the product of two rational #'s, right?

2007-12-02 18:28:26 · 3 answers · asked by netsurfer733 2 in Mathematics

steps in completeing the square for this equation?

2007-12-02 18:26:02 · 7 answers · asked by chuck g 1 in Mathematics

Wikipedia has some excellent info, but doesn't cover some details I need, such as this one. Could I get a layman's answer, since physics principles are a bit over my head?

2007-12-02 18:25:05 · 2 answers · asked by Eric 3 in Physics

In my apartment, the maintenance person badly wired an electric outlet during a repair, and when I went to switch a nearby light on, I was jolted with a full load. I was not wearing shoes for insulation (just socks). I experienced some moderate pain and tingling in the arm. Is there any chance for long term damage? Or can I assume that there are no serious problems as the pain seems to be receding?

2007-12-02 18:13:32 · 13 answers · asked by jjrousseau 2 in Engineering

The split units is to be installed in a room full of communication equipment etc transmission studio.

2007-12-02 18:09:47 · 1 answers · asked by Jazmi Harun 1 in Engineering

If the center of the target is level with the rifle, how high (in cm) above the target must the rifle barrel be pointed so that the bullet hits dead center?
physics problem.
I try many times with no luck, need help!!!!!

2007-12-02 18:06:37 · 2 answers · asked by ocire7 1 in Physics

2007-12-02 18:05:07 · 3 answers · asked by Stuart C 1 in Engineering

The problem states: Find the volume of the solid bounded by the cylinder x=y^2 and the planes z=0 and z=4-x. HELP ME!!!

2007-12-02 18:03:03 · 2 answers · asked by Anonymous in Mathematics

Ok, so my question is most scientist agree that space is infinite, theoretically speaking. What are the numbers that prove this? Equations? Can someone point me in the right direction here.

2007-12-02 18:02:44 · 7 answers · asked by MXG 2 in Astronomy & Space

hey i suck at this. i really do. ive never understood it so if someone can help. im designing a gallery for my design project. my total rise to the next floor is 15 feet. i need to know like exactly how far apart to put each piece and the tread. ....HELP! i know it sounds like im an idiot but im not! ive just never done this before please help as soon as possible. it would be greatly appreciated

2007-12-02 17:59:10 · 4 answers · asked by Anonymous in Engineering

what's the temperature ranges is considered the danger zone for food borne microbes to flourish?

2007-12-02 17:57:32 · 0 answers · asked by kk^Q^ 7 in Biology

This is for a school project and for some research. Any help will be much appreciated! :)

2007-12-02 17:45:29 · 7 answers · asked by jfiw 2 in Astronomy & Space

y=2log base1/2 (x-3)

2007-12-02 17:44:32 · 1 answers · asked by Hello There 1 in Mathematics

series: sin (4/n)

2007-12-02 17:41:49 · 1 answers · asked by chimstr 1 in Mathematics

Many countries have either st8s or provinces. The U.S., Mexico, & Australia has states. Canada, China, & Papua New Guinea has provinces. Additionally, Japan has prefectures and Russia & Ukraine has oblasts. I just need 2 know if the difference between a province & a st8 has 2 do w/ the type of government in that country. It can't be whether it has a president or prime minister, as Canada & Australia has prime ministers but Australia has states (& 2 territories).

2007-12-02 17:33:54 · 2 answers · asked by The Glorious S.O.B. 7 in Geography

(-4^-2x)^-2 e^22x

2007-12-02 17:24:05 · 1 answers · asked by Hello There 1 in Mathematics

2007-12-02 17:19:41 · 1 answers · asked by sci_voir 1 in Biology

2007-12-02 17:17:46 · 5 answers · asked by Golu S 1 in Biology

Could we function without DNA?

I think that our genetic make-up would be completely out of wack. What would life be like? I think that is impossible but I'm not completely sure. Voice your opinion, thanks.

2007-12-02 17:15:49 · 4 answers · asked by Troy B 2 in Biology