Science & Mathematics - 27 January 2007

A 89 kg fullback, running at 8.2 m/s, collides in midair with a 129 kg defensive tackle moving in the opposite direction. Both players end up with zero speed.

(a) What was the fullback's momentum before the collision?

(b) What was the change in the fullback's momentum?

(c) What was the change in the tackle's momentum?

(d) What was the tackle's original momentum?

(e) How fast was the tackle moving originally?

2007-01-27 18:24:32 · 2 answers · asked by azndancer4life 1 in Physics

If the secondary current from a 50 watt light supplied through a 240 volt to 12 volt transformer is approx 4 amps what is the input current on the 240 volt supply side.

2007-01-27 18:23:33 · 3 answers · asked by WM 2 in Physics

In product toplogy, the sets of the form U_1 x U_2 x ... x U_n are open, where U_i are open . Are there any other sets which are open?
Thanks

2007-01-27 18:19:45 · 2 answers · asked by Theta40 7 in Mathematics

2007-01-27 18:18:26 · 5 answers · asked by Booyah! 3 in Biology

2007-01-27 18:16:00 · 3 answers · asked by .nicole. 1 in Weather

2007-01-27 18:14:10 · 2 answers · asked by Booyah! 3 in Biology

2007-01-27 18:14:01 · 1 answers · asked by ravi g 1 in Geography

2007-01-27 18:09:55 · 5 answers · asked by Anonymous in Astronomy & Space

If the background countrate is 1 per second and the countrate with the beta source present is only 3 per second, how long would you have to measure the background counts and how long would you have to measure the beta source counts in order to have 1% precision in the difference between the two countrates? x=3...P(m)=((x^m)/m!)(e^-x)

2007-01-27 18:09:03 · 1 answers · asked by chijliak 1 in Physics

2007-01-27 18:06:53 · 6 answers · asked by Don B 2 in Geography

Please Answer this!!! I am Needing it!!!!!!

2007-01-27 18:00:24 · 8 answers · asked by Anonymous in Mathematics

Example 4*4=16-4=12/4=3+4=7
can be in any order but only using the number 4 answer must be 10

2007-01-27 17:59:36 · 12 answers · asked by BOBBI D 1 in Mathematics

2007-01-27 17:59:22 · 5 answers · asked by Marib the coolest & rocking dude 1 in Geography

I'm looking for a photo(s) of something I saw when I was a kid in a history or science book, or maybe even an encyclopedia. It was a type of large "dinosaur-like" sea creature, or atleast that's what they believed it to be. It was surprisingly well preserved, and they were bringing it up out of the ocean on what, to my young mind, looked to be like a crane. I hope I'm providing enough information, but it's a memory I've never forgotten and I've always wanted to see the photo(s) again and read on it now that I'm older. I'm looking for an online link to the photos/story. Any help would be much appreciated.

2007-01-27 17:53:17 · 3 answers · asked by Unknown 2 in Earth Sciences & Geology

2007-01-27 17:48:26 · 1 answers · asked by Anonymous in Engineering

I know that a^2+b^2=c^2, I know the definition of the Pythagorean Theorem, I know where and when to use it, and how to use it accurately. My question is, why does it work? What's the pattern that exists that makes the Pythagorean Theorem work with every right triangle. Why does a^2+b^2=c^2? This has been a puzzler for me for a while. Could someone explain this to me? Thanks, I appreciate any answers. :)

2007-01-27 17:47:41 · 9 answers · asked by iamanicecaringfriend 3 in Mathematics

2007-01-27 17:47:20 · 5 answers · asked by ♪ ♫ ☮ NYbron ☮ ♪ ♫ 6 in Other - Science

I need to solve a system of equation using the formula x=A^-1b(imagine the x and b have lines over the top of them) using the adjoint method to find the inverse.

xsubscript(1) + 2xsubscript(2) = 3
-2xsubscript(1) + xsubscript(2) = 4

x+2x=3
-2x+x=4

Can someone please help I am totally lost?!!!!!

2007-01-27 17:44:57 · 3 answers · asked by Smokey. 6 in Mathematics

If they collect a baby's cord blod to store and the baby is born with a birth defect like an ear not developed right, can his stem cells be used to regenerate the ear so that it can be implanted on the new born baby?

2007-01-27 17:43:31 · 4 answers · asked by Suntoosoon 2 in Biology

a meterologist measure the temperature nine times in one area to find the temperature

2007-01-27 17:43:24 · 4 answers · asked by .nicole. 1 in Weather

2007-01-27 17:40:41 · 4 answers · asked by Anonymous in Mathematics

2007-01-27 17:37:55 · 6 answers · asked by deepak k 1 in Engineering

2007-01-27 17:36:48 · 1 answers · asked by freaking_naj 1 in Chemistry

It has been said that Jupiter would be a star if it where not for its size. Even though it is by far the largest planet in the solar system it isn't even close to being the size of our sun. But what if; lets say another huge mass crashed into it. Could this cause the planet to reach a large enough size to become a star?

2007-01-27 17:36:45 · 11 answers · asked by Anonymous in Astronomy & Space

why do you see scientist use white rats for exsperiments for human disecesis instead of colored rats

2007-01-27 17:36:08 · 3 answers · asked by timothy f 1 in Biology

2007-01-27 17:31:30 · 12 answers · asked by natasha 1 in Physics

A 20 gram bullet is fired horizontally into a 5 kg block of wood suspended by a long cord. The bullet sticks in the block. Determine the velocity of the bullet if the inelastic collision causes the block to swing 0.08m above its intial level.

2007-01-27 17:31:08 · 1 answers · asked by khenzkey_wawa08 1 in Physics

Could anyone explain what is "ln" and how to solve
ln x + ln(2x + 1)=0


Thank you very much!! :p

2007-01-27 17:21:27 · 14 answers · asked by Anonymous in Mathematics

all importance of mountains

2007-01-27 17:21:19 · 5 answers · asked by melissa u 1 in Geography

Like for example, I know some come from outside, but like say you leave food out and then you have these small little bugs that come from nowhere...how do they just originate themselves? Also, how can you get rid of them?

2007-01-27 17:19:26 · 11 answers · asked by Anonymous in Zoology