Science & Mathematics - 30 October 2007

a baseball has mass .145. If the velocity of a pitched ball has a magnitude of 40.0 m/s and the batted ball's velocity is 65.0 m/s in the opposite direction, find the magnitude of the change in momentum of the ball.

2007-10-30 12:22:08 · 2 answers · asked by h k 2 in Physics

A 76g particle moving with an initial speed of 150 m/s in the positive x direction strikes and sticks to an 80g particle moving with 72 m/s in the positive y direction.
How much kinetic energy is lost in this collision? Answer in units of J.

2007-10-30 12:20:29 · 1 answers · asked by MD12 2 in Physics

what is one example of a predator-prey relationship?

2007-10-30 12:18:49 · 4 answers · asked by Bea. 1 in Zoology

A student makes and sells necklaces at the beach during the summer months. The material for each necklace costs him $6 and he sells an average of 20 per day at $10 each. He’s been wondering whether he should raise the price, so he conducts a survey and finds that for every dollar increase he loses two sales a day. What price should he set for the necklaces to maximize his profit?

please show all work..

2007-10-30 12:18:36 · 6 answers · asked by Anonymous in Mathematics

Use the percent proportion to solve each problem.

1) 18 is what percent of 45?
2) What percent of 60 is 39?
3)23 is 92% of what number?
4)What is 74% of 110?
5)What is 80% of 62.5?
6)36 is 15% of what number?

2007-10-30 12:18:02 · 6 answers · asked by haaaaahaaaa! 1 in Mathematics

There were 360 pumpkins in a pumpkin patch, but it was difficult for Farmer Joe to Find the perfect pumpkin.


Every 3rd pumpkin was too small
Every 4th pumpkin was too green
Every 5th pumpkin had a broken steam
Every 6th pumpkin had the wrong shape.

How many perfect pumpkins did Farmer Joe find in the pumpkin patch?

Can you please show a complete explanation of your work.


Than You Really Appreciate It?

2007-10-30 12:17:11 · 4 answers · asked by Anonymous in Mathematics

2007-10-30 12:16:36 · 3 answers · asked by Bayard Lady 6 in Astronomy & Space

that would explain the difficulty of traveling great distances into the universe wouldn't it?

2007-10-30 12:16:21 · 7 answers · asked by disarmed3 2 in Astronomy & Space

Could anyone explain this to me? Thanks!

2007-10-30 12:15:20 · 4 answers · asked by Anonymous in Mathematics

Express each decimal or fraction as a percent. Round to the nearest tenth percent, if necessary.

1) 0.24

2) 0.03

3) 0.452

4) 1.9

5) 2/5

6) 13/22

7) 6/80

8) 77/225

2007-10-30 12:15:15 · 4 answers · asked by haaaaahaaaa! 1 in Mathematics

why??

2007-10-30 12:09:01 · 3 answers · asked by americaneagleliveurlife 1 in Earth Sciences & Geology

http://college.hmco.com/mathematics/larson/algebra_trig/7e/assets/students/cp/03.pdf

How do you get from the original eqation of:

X^2+Y^2-3X+5Y-11=0 all the way to the solution (which they give as the top and botom half of the circle)??? Please help, THANK YOU

2007-10-30 12:08:16 · 1 answers · asked by Anonymous in Mathematics

2007-10-30 12:08:04 · 10 answers · asked by Anonymous in Engineering

Anything that can alter me on a molecular level shurely can't be that good for you?
it's called DNage

2007-10-30 12:07:23 · 4 answers · asked by Anonymous in Other - Science

RUSSIA, CANADA, CHINA
HURRRRRRRRYYYY
plz

2007-10-30 12:03:57 · 6 answers · asked by AMIT IS MY NAME!!!!!!!!!! 2 in Geography

The sex ratio of newborn human infants is about 105 males to 100 females. If four infants are chosen at a time, what is the probability that

a. two are male and two are female
b. all four are male
c all four are the same sex

Someone please help it would be greatly appreciated!

2007-10-30 12:02:46 · 2 answers · asked by summitgirl06 1 in Biology

It hooks up, then revereses, comes to a complete stop and and then starts to go forward. I have no idea....

2007-10-30 12:02:38 · 1 answers · asked by Anonymous in Physics

2007-10-30 12:00:46 · 4 answers · asked by katelynjohofstetter 1 in Mathematics

How do I show the expected value, of e^x?

Calculate E[e^(x) | X+Y]

Given gx(x) = gy(x) = e^((-x^2)/2) / (sqrt(2pi))
It is also known that X & Y are standard normal variables.

Thank you!

2007-10-30 12:00:08 · 1 answers · asked by Christopher M 2 in Mathematics

Why did Mendel let the pea plants self- fertilize before performing his experiments??? What good does this do, since in the end all you end up is "exact copies" (asexual reproduction) of the intitial plants???

2007-10-30 12:00:02 · 3 answers · asked by Anonymous in Botany

This is the situation:

A ball is attached to a rope which is spinning (vertically) at a constant rate. Now when you need to calculate the acceleration being exerted on the ball AT THE TOP, you subtract gravity from from the NORMAL force, because the gravity is pulling down and the Normal force us pushing up.

My question is: why is the Normal force pushing up. Shouldn't it be pushing in the same direction as gravity.

2007-10-30 11:59:37 · 2 answers · asked by Anonymous in Physics

at austin shoe factory 5 pairs of shoes, on average, can be placed in shoe boxes every 3 minutes. at this rate, how many pairs of shoes can be placed in shoe boxes during 8 hours of work?

2007-10-30 11:58:25 · 4 answers · asked by FRANCISCO M 2 in Mathematics

question: a 2.1 x 10^3 kg car starts from rest at the top of a driveway that is sloped at an angle of 20.0 degrees with the horizontal. an average friction force of 4.0 x 10^3 N implodes the car's motion so that the car's speed at the bottom of the driveway is 3.8 m/s. What is the length of the driveway?

(question involves work-kinetic thm)

answer: 5.1m

how do you get this answer?

2007-10-30 11:57:37 · 1 answers · asked by Haya 1 in Physics

why is an ionic compound noncondutive in its solid form but a good condutor of electticity???? and what other state is an ionic compound conductive???

2007-10-30 11:57:24 · 2 answers · asked by nichole 1 in Chemistry

measurements of floor---76 ft. at bottom--40 ft. left side--38ft. top go down 12 ft. right side is 20 ft. cost tile is 1.19 how many tiles and what will be the cost.

2007-10-30 11:56:52 · 3 answers · asked by latesleeper17 1 in Mathematics

2007-10-30 11:56:13 · 1 answers · asked by hazeleyedgirl 1 in Chemistry

Structurally, what are the major differences between mesopytes, hydrophytes, and xerophytes?

2007-10-30 11:55:34 · 4 answers · asked by Dave H 2 in Botany

what atoms are in copper family , and what are there shared characteristics?

2007-10-30 11:55:32 · 2 answers · asked by Anonymous in Chemistry

2007-10-30 11:54:20 · 3 answers · asked by Anonymous in Weather

2007-10-30 11:53:56 · 4 answers · asked by T 1 in Zoology