Science & Mathematics - 7 November 2007

Question: A vertical spring (ignore its mass), whose spring constant is 900 N/m is attached to a table and is compressed 0.150m.
A) What speed can it give to a .300kg ball when released?
(Answer: 8.03 m/s)
B) how high above its original (compressed) position will the ball fly?
(Answer: 3.44 m)

I have the answers, I just need to find out how to get there.

My main question is how to find the velocity without knowing the distance it will fly, and vice versa. But I think my formula might be wrong, I've written:
SE (spring energy) = KE (kinetic energy) + U (potential energy)

I failed tremendously doing this, so I tried it without potential and got close to the right answer, but not exact, so I think i'm missing something. Help??

2007-11-07 18:15:36 · 3 answers · asked by Anonymous in Physics

At the intersection of Texas Avenue and University Drive, a yellow, subcompact car with mass 950 kg traveling east on University collides with a maroon pickup truck with mass 1900 kg that is traveling north on Texas and ran a red light . The two vehicles stick together as a result of the collision and, after the collision, the wreckage is sliding at 16.0 m/s in the direction 24 degrees east of north. The collision occurs during a heavy rainstorm; you can ignore friction forces between the vehicles and the wet road.

a)Calculate the speed of the car before the collision.
b)Calculate the speed of the truck before the collision.

i'm not sure how to do the problem if i have two variables and one equation.....please help....

this is the equation i got......
950 Vc +1900 Vt = 45600
where Vc=initial velovity of car
and Vt = initial velocity of truck

2007-11-07 18:09:29 · 1 answers · asked by sandymandy 1 in Physics

calcium hydroxide, how many grams of sodium hydroxide are formed?

Na2CO3 + Ca(OH) 2 -------> NaOH + CaCO3,
the answer is 90.4 grams, how do i get this?
thanks

2007-11-07 18:04:59 · 4 answers · asked by Boo Radley 4 in Chemistry

a. permanently raises the number of white blood cells in the body

b. creates memory cells that produce specific antibodies

c. causes the disease, which you will only get one time in your life

d. consists of particles that stay in the body permanently and destroy viruses

2007-11-07 17:58:08 · 11 answers · asked by Mimi 2 in Biology

With genetic disorders and diseases ever increasing---from 1400 to 12,000 in the 33 years from 1966 to 1999 and projected to increase further, are we doomed to extinction by the end of this century as some researchers have stated?
Quote "By 2031, it is estimated (R2 = 0.995) there will be 100,000 human genetic disorders and by 2096 1,000,000 (see Figure 3). “At least one clinical disorder has been related to 1,318 of the mapped loci (roughly 30%)” (McKusick, 1998, Vol. 1, xiii - xviii). That suggests genetic disorder saturation of each locus by 2031 and supersaturation by 2096. These data confirm human devolution and suggest imminent permanent genetic extinction in this century."
Source--http://www.csulb.edu/~jmastrop/data3.html
Related articles....
http://search.yahoo.com/search;_ylt=A0geu.WwrTJHLIgAycFXNyoA?p=genetic+disorders+on+the+rise&fr=ush-ans
http://search.yahoo.com/search;_ylt=A0geu.WwrTJHLIgAycFXNyoA?p=genetic+disorders+on+the+rise&fr=ush-an

2007-11-07 17:53:30 · 9 answers · asked by paul h 7 in Biology

A singly ionized 24Mg ion (mass: 3.983x10^kg) is accelerated through a 2.5kV potential difference & deflection in a magnetic field of 0.0557 T in a mass spectrometer.(A) Find the radius of curvature of the orbit for the ion. (B) What is the difference in radius for 26Mg ions and for 24Mg ions? (assume that their mass ratio is 26:24) OK SOMEONE HELP... and by chance does anyone know a good website to help with college physics?

2007-11-07 17:51:42 · 3 answers · asked by a.n. 1 in Physics

this was posted on my space... via bulletin.. i can not find it can you??

FIND THE ERROR!!! THIS IS HARD!!

000
111
222
333
444
555
666
777
888
999

Did you know that 80% of UCSD students
could not find the error above?

2007-11-07 17:49:57 · 10 answers · asked by Anonymous in Mathematics

O:

2007-11-07 17:38:42 · 2 answers · asked by allison t 2 in Astronomy & Space

So my problem says that gold can be oxidized by bromine triflouride. This apparently all happens according to the following redox reaction: 2Au + 2BrF3 + 2KF ---> 2KauF4 + Br2. Say these 3 reactants were all mixed together into equal masses giving it a total mass of 39.2 g. How many grams of KAuF4 were produced from this? Can anyone help me?

2007-11-07 17:34:02 · 2 answers · asked by David R 1 in Chemistry

The density of a bottle of concentrated HCl has a density of 1.2g/ml and contains 36% of HCl. what is the molarity and molality of HCl in this solution?

2007-11-07 17:31:43 · 3 answers · asked by Anonymous in Chemistry

If two angles in a ____ are congruent, the rays are perpendicular.
The word(s) is/are 10 letters altogether. If it is two words, there is no space between them.
The 2nd letter is I, 6th letter is R, and 10th letter is R.
Thanks in Advance.

2007-11-07 17:31:19 · 3 answers · asked by janetツ 3 in Mathematics

How would I calculate the minimum volume (in milliteters) of O.468 M of hydrochloric acid that would be necessary to completely dissolve 1.19 grams of aluminum hydroxide. Any ideas? Thanks for any help.

2007-11-07 17:30:10 · 3 answers · asked by Christine O 1 in Chemistry

what would fort worth be considered? it is usually like a oven...hot and there is like no air u cant breathe! it sucks although many times when it is night......it gets cool...
los angeles has perfect weather! even when it is hot (it doesnt get that hot usually) and sunny..there is wind so u dont sweat...so u dont have to run to ur car...the air is moving...so ur clothes dont stick to u!! in fort worth ur clothes stick to u! lol it is eway too expensive to live in california though....i just dont like weather that is like an oven..no air...but then again who would?

2007-11-07 17:29:43 · 2 answers · asked by Anonymous in Weather

2007-11-07 17:19:22 · 16 answers · asked by yodude 1 in Earth Sciences & Geology

2007-11-07 17:18:12 · 15 answers · asked by namso141 3 in Mathematics

Find the solution to the differential equation below, subject to the given initial condition.

1) P(dB/dt)= 0, P(0)= 1
P(t)=?

2007-11-07 17:03:28 · 1 answers · asked by Victor 1 in Mathematics

There are fewer than 6 dozen eggs in a basket. If I count them by 2s, there is 1 left over. If i count them by 3s, there are 2 left over. If I count them by 4s, 3 are left over. If i count by 5s, there are 4 left over. HOw many eggs are there????


I know it's an odd number and its a pattern.

2007-11-07 16:59:10 · 5 answers · asked by Steffi loves Bob!!! 1 in Mathematics

Okay...I have this problem that I need help on solving...

1. a) Use rectangles to estimate the area under the curve y=x^(2) + 1, using 4 rectangles. Do so using the left endpoint of each interval.

b) Is your estimate an "overestimate" or an "underestimate" of the true area underneath the curve y= x^(2) + 1?

c) Determine the "actual area" under the curve y=x^(2) + 1 by evaluating the integral on the interval [0,1].

If anyone can...Please help me...Thanks in advance...

2007-11-07 16:57:56 · 3 answers · asked by Anonymous in Mathematics

2007-11-07 16:51:10 · 2 answers · asked by Debashree 1 in Physics

lim tan6x/sin2t
x-> 0

i know the answers 3 by using the table method but i need to know how to work it out using trig functions? Any help would be sweet.
cheers

2007-11-07 16:49:31 · 2 answers · asked by Anonymous in Mathematics

2007-11-07 16:45:12 · 3 answers · asked by caro 1 in Chemistry

Is it a "Grapenut?"

2007-11-07 16:44:14 · 8 answers · asked by Pull My Finger 7 in Physics

what is the probabilitym that both recessive genes will be contributed to the child for a specific trait(both parent are heterozygous)

2007-11-07 16:41:35 · 5 answers · asked by Anonymous in Biology

OK I can't Spell it. But I still don't know what they are?
All I've heard is they can travel faster than the speed if light.
Were do they come from?
How do we know they exist?
Any help here?

2007-11-07 16:41:06 · 3 answers · asked by Paa Pop! 2 in Physics

I want to be a zookeeper and I really wanted to be in the marine animals but cant swim so that kills that lol so now Im looking for what type of animal I want to work with I do not want to be with carnivores or any of the feline or bears I want a animal who is vegatarian and is has less chances of attacking its new keeper and if you are a keeper tell me is it fun I know you gotta pick up poop and clean them feed them and check them but what is cool about it whats the pay will I be able to live of the money(its not bout money but fun but I gotta live thanx :)

2007-11-07 16:39:50 · 7 answers · asked by Anonymous in Zoology

Has anyone else noticed that when you first step on to an escalator that is not moving you feel unbalanced. Why is this??

2007-11-07 16:35:48 · 10 answers · asked by Anonymous in Other - Science

A. 1 1/3 x 2/5
B.) 1 2/3 x 3/5
C.) 1 1/4 x 1 1/2
D.) 4/5 x 2/3
thnx

2007-11-07 16:31:23 · 2 answers · asked by Anonymous in Mathematics

(1,2), (3,4)

I did this a while ago, but I forgot everything about it.

2007-11-07 16:29:56 · 6 answers · asked by Joyce W 2 in Mathematics

2007-11-07 16:27:54 · 2 answers · asked by SimpleMe 2 in Mathematics

Electronics - microcontroler - programmer

2007-11-07 16:27:01 · 1 answers · asked by Roohallah M 1 in Engineering