Science & Mathematics - 28 July 2007

The density function of X is given by

f(x) = a + bx^2 if 0 ≤ x ≤ 1
f(x) = 0 otherwise

If the expectation of X is E(X) = 5, find a and b.
a = _______
b = _______

2007-07-28 18:55:04 · 4 answers · asked by Anonymous in Mathematics

2x^2+x-1>0

2007-07-28 18:54:18 · 2 answers · asked by martinez_bonnie1 1 in Mathematics

what is special character found in that rice when compared to other rice variety.

2007-07-28 18:53:17 · 2 answers · asked by dhivvya r 1 in Agriculture

I am in a Physics class and I need to get an answer for this question. Can somebody please help me out?

2007-07-28 18:39:50 · 2 answers · asked by ursolastsummer! 2 in Physics

2007-07-28 18:38:15 · 8 answers · asked by Shaun R 4 in Mathematics

Plz help me thx..

1) what is the impulse due to a force rthat causes the speed of a 46 g golf ball to change from 0 to 60.0 m/s in 0.50ms?

2) A 0.250 kg ball of Plasticine moving 5.0 m/s overtakes and collides with a 0.3000 kg ball of Plasticine, traveling in the same directiion at 2.0 m/s. The 2 balls of Plasticine stick together pm collison. What is their speed after the collision.

3) A 4.2 kg rifle shoots a 0.05 kg bullet at a speed of 3.00 * 10^2 m/s. At what speed does the rife recoil?

4) A railroad car of mass 12,000kg is traveling at a speed of 6.0 m/s when it collies with an identical car at rest. Thte two cars look together. What is their common speed after the collision?

5) What impuse is needed to change the speed of a 10 kg object from 1.6 m/s to 25.5 m/s in a time of 5s. How much force is needed?

It would be awesome to show the steps...
Once again, ty so much.........

2007-07-28 18:34:36 · 4 answers · asked by Anonymous in Physics

2007-07-28 18:33:46 · 1 answers · asked by Naanakka 2 in Medicine

please help! I'm an LOA student this semester because of an operation. but i'm still trying to study so my brain would be ready when i come back to school..

WORK PROBLEM:
Find four numbers such that the sum of the first, third, and fourth exceeds the second by 8; the sum of the squares of the first and the second exceeds the sum of the squares of the third and fourth by 36; the sum of the products of the first and second, third and fourth is 42 (meaning: [(1st x 2nd) + (3rd x 4th) = 42]); the cube of the first equals the sum of the cubes of the second, third, and fourth.

thanks in advance!

2007-07-28 18:24:10 · 2 answers · asked by Anonymous in Mathematics

2007-07-28 18:19:10 · 3 answers · asked by vivek b 1 in Chemistry

Our country sent (mostly) men who were genetically healthy, emotionally strong, with intestinal fortitude into battle...losing hundreds of thousands.

With so many healthy men being killed in war, does it increase the percentage of men left at home who are men with genetic defects and mental illnesses or weaknesses?

My question: could the deaths of healthy young soldiers from our nation be the cause of an increase in genetic defects which (might) cause obesity and mental illness (depression) in our young?

2007-07-28 18:17:30 · 5 answers · asked by Anonymous in Medicine

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.

y = x^2, y = 0, x = 0; x = 3, about the y-axis

2007-07-28 18:16:38 · 3 answers · asked by Anonymous in Mathematics

2007-07-28 18:03:14 · 6 answers · asked by missprissy1004 2 in Mathematics

cold blooded animals tend to rest when the environmental temperature is low. what advantage does human have over the lizard in terms of night activities when the environmental temp is low?

2007-07-28 17:49:03 · 6 answers · asked by christine 2 in Zoology

We've had this technology since Tesla discovered it. The Navy started dabbling with the "Philedalphia Experiment."
Why do the Governments continue to withhold this information?
http://rds.yahoo.com/_ylt=A0oGkmiTG6xGflgAInBXNyoA;_ylu=X3oDMTExZnBsOTUwBHNlYwNzcgRwb3MDNQRjb2xvA3NrMQR2dGlkAwRsA1dTMQ--/SIG=11c01oguu/EXP=1185770771/**http%3a//www.zpenergy.com/

2007-07-28 17:47:01 · 10 answers · asked by Honey Girl 3 in Physics

2007-07-28 17:45:43 · 1 answers · asked by Peggy Pirate 6 in Earth Sciences & Geology

2007-07-28 17:43:52 · 3 answers · asked by christine 2 in Other - Science

2007-07-28 17:41:00 · 5 answers · asked by Shaun R 4 in Mathematics

isn't it logical that the moon came out of the earth if it is millions and millions of years old? I am not bashing anyones theories or point of views either way I want a clear answer so I can agrue reasonably with my friends.

2007-07-28 17:40:35 · 6 answers · asked by ? 4 in Astronomy & Space

what is the equation of the line that passes through the points (3, -2) and (7,-2). its the last question and i have no clue how to do it.

2007-07-28 17:35:21 · 8 answers · asked by ilovehur42 2 in Mathematics

2007-07-28 17:34:14 · 10 answers · asked by Anonymous in Astronomy & Space

2007-07-28 17:33:06 · 7 answers · asked by abilash s 1 in Zoology

want to join the team of field engineers in Halliburton, Schlumberger or Baker Huges. am startin my third year in Mech. Engineering this sept, and hoping to work anywere in the world next summer as a filed engineer for one of this 3 companies or any other oil company. any ideas plz or stories from anyone?

2007-07-28 17:28:27 · 2 answers · asked by Funk-Ski Biznez Man 4 in Engineering

2 vegetables plots, a and b, in an open field were selcted for an experiment. an a, all the dead parts of the plants were cut and thrown away as soon as they appeared. in b, the dead parts were allowed to fall and decay in the ground.

after sometime, the plants in b were growing better than those in a. what was the most likely cause? EXPLAIN.

2007-07-28 17:25:53 · 4 answers · asked by christine 2 in Botany

2007-07-28 17:17:12 · 2 answers · asked by shano 2006 1 in Other - Science

I mean its was only one continent and then it broke up well how and why did the earth do that?

2007-07-28 17:16:09 · 5 answers · asked by lil monkey 1 in Earth Sciences & Geology

2007-07-28 17:15:47 · 6 answers · asked by tnarg60 2 in Engineering

2007-07-28 17:12:30 · 4 answers · asked by ? 7 in Zoology

2007-07-28 17:10:44 · 14 answers · asked by boomer 1 in Zoology

what could the reaction be?

2007-07-28 17:09:59 · 1 answers · asked by rocky 2 in Chemistry

If there is life on this planet, don't you think there could be life on another?

2007-07-28 17:07:05 · 10 answers · asked by Patty M 5 in Astronomy & Space