Science & Mathematics - 20 September 2007

a). The work done in holding a 50kg object at a height of 2 m above the floor for 10s is?

b). A total of 4900J is used to lift a 50-kg mass. The mass is raised to a height of?

c). A 1-kg object has kinetic energy of 1 J when its speed is?

2007-09-20 12:30:06 · 2 answers · asked by TwiggyRamirez 2 in Mathematics

after solving and putting in simplest form I got 4cd. Is this correct?

2007-09-20 12:24:56 · 8 answers · asked by Anonymous in Mathematics

we did a lab where you time how long it takes for a cart to roll down a plank of wood at difference angles.

1. What are 3 sources of error?
2. What is the cause of the most error?
3. How does friction change with increased angle?
4. Is the acceleration (without friction) uniform?


any help will be VERY MUCH appreciated. THANK YOU!

2007-09-20 12:24:10 · 3 answers · asked by brubabe 5 in Physics

2007-09-20 12:21:11 · 11 answers · asked by Monkey091595 1 in Biology

to each orher, and can be found in the same location (inside your body). are these cells a population?

2007-09-20 12:20:51 · 1 answers · asked by almost lover 2 in Biology

2007-09-20 12:20:31 · 3 answers · asked by Sarah R 1 in Mathematics

I know that it's sort of a no duh thing. An absolute value will of course be more than a negative number.

2007-09-20 12:20:05 · 2 answers · asked by doomgrr 2 in Mathematics

digestive system, stomach, and intestines?

2007-09-20 12:18:42 · 2 answers · asked by almost lover 2 in Biology

If you know this then can you tell me which ones match?
1/4 ac=bc
a-b=6 25%
3/4=9/x a+c=b+c
x+4=20 45
4x=2x+24 a-c=b-c
a=b a=6-b
1/2 of 90 11/25
44% .25
2x-4=28 x=16
a+b=6 a/c=b/c
a=6+b

2007-09-20 12:16:45 · 3 answers · asked by Anonymous in Mathematics

I am scheduled to have an MRI and I was wondering about taking a seditave to make it easier to be calm. The doctor who scheduled the MRI said to contact my family doctor to get a sedative. Can anyone with MRI experience recommend a particular seditave that works well? Are there any to avoid?

2007-09-20 12:16:44 · 9 answers · asked by Valerie H 2 in Medicine

It's sunset and the Moon is on the western horizon. What phase is it?
It's midnight and the Moon is just rising. What phase is it?
It's midnight and the Moon is just setting. What phase is it?
It's noon and the Moon is overhead. What phase is it?
It's 3AM and the Moon is waning crescent. Where is the moon in the sky?
It's 3PM and the Moon is waxing crescent. Where is the moon in the sky?
It's 9AM and the Moon is waxing crescent. Where is the Moon in the sky?
It's 9PM and the Moon is waxing gibbous. Where is the Moon in the sky?
A waxing crescent moon is high in the sky. What time is it?
A waxing gibbous is on the western horizon. What time is it?
It's 3PM and the Moon is on the western horizon. What phase is it?
It's 9PM and the Moon is just rising. What phase is it?
It's 9PM and the Moon is just setting. What phase is it?
It's 3AM and the Moon is overhead. What phase is it?
PLEASE HELP!!! THANK YOU!!!!!

2007-09-20 12:13:47 · 7 answers · asked by Anonymous in Astronomy & Space

Identify the hypothesis and conclusion of each conditional.Write the converse of each conditional.If the converse is false,give a counterexample to show that it is false.

If it is snowing in Chicago,then it is snowing in Illinois.

If Two angles are complementary,then the sum of their measures is 90 degress.

[I need just need help with these 2 just to get an example of what I am doing thanx]
=]

2007-09-20 12:10:11 · 2 answers · asked by Cookie Gurl 1 in Mathematics

I believe the earth's magnetism is changing over time and might reverse completely. This could have big effects, beyond the need for an Ionic magnetic bracelet.

Could magnetic properties of the earth affect global warming somehow, or the ozone hole, or human health, vitality or height, etc?

Crazy ideas are sometimes true, much to our amazement. I think I'm talking myself into getting a magnetic bracelet. I've met people that swear by them.

2007-09-20 12:08:49 · 4 answers · asked by Anonymous in Earth Sciences & Geology

what is mass? how are some ways that it can be measured?

2007-09-20 12:08:49 · 7 answers · asked by Sarah S 3 in Physics

what is the velocity when the wrench strikes the ground?

could you tell me which formula to use (acceleration, velocity, or displacement?)

I dont understand what the variables are or which formula to use. please explain!! Thanx

2007-09-20 12:03:50 · 5 answers · asked by Smiley 3 in Physics

Solve 8r + 4(2r - 6) = 4r - 4

A. 8/3
B. 5/3
C. 3
D. 2

2007-09-20 12:02:50 · 13 answers · asked by Anonymous in Mathematics

commercial supplements intended for good physical fitness ? THanks

2007-09-20 12:02:23 · 1 answers · asked by Caysie101 5 in Medicine

J2me is the Java's software for mobile devices. I need it for my chemistry exam. Please! It's important; very.

2007-09-20 12:01:50 · 1 answers · asked by Anonymous in Chemistry

Why or why not?

2007-09-20 12:01:23 · 8 answers · asked by Jen2U 3 in Zoology

and if anyone could explain how to do this on a graphing calculator that would be great

2007-09-20 12:00:58 · 5 answers · asked by kachilous_2002 1 in Mathematics

can you list all the books that he wrote

2007-09-20 12:00:43 · 2 answers · asked by jeffhardy3 2 in Biology

2007-09-20 12:00:27 · 9 answers · asked by atlien2008 1 in Mathematics

its absolute value

-12 |9x+1| =144

please show the steps on how you get the answer. thanks.

2007-09-20 11:58:01 · 1 answers · asked by Michael R 1 in Mathematics

1.How many numbers between 100 and 200 can be expressed as powers of 2?Show steps.
2.Which power of 2 is closest to 1000?

2007-09-20 11:57:37 · 8 answers · asked by Natty 2 in Mathematics

and the U.S have a disagreement about land?

2007-09-20 11:56:42 · 2 answers · asked by Anonymous in Earth Sciences & Geology

hi ok the details are you cano nly use the numbers 1,4,8,and 9 and you can only use the once in each secunse. You have to use all the numbers, you can't use a 2 diget number. You can use any mathimaticl epression.

the numbers I need are 1, 7, 16, 26, 30, 34, 38, 39, 47-49, 51, 57, 61-66, 71-74, 78-83, 87-89, 93-95

If you can get any of thouse number it would really help and I would like it for mon sept 24 if you can

THANK-YOU for looking/answering my question

2007-09-20 11:51:46 · 2 answers · asked by Anonymous in Mathematics

what is the proper term for this (X^2+8x +16)

is it a trinomial?

& what is it called when i have to do this 3(X^2+8x +16)
i say distribute....right????

plz & thanks!

2007-09-20 11:50:23 · 5 answers · asked by *~JeS~* 5 in Mathematics

i no it is kind of cheating bt ive been looking for a longg time at least 20 minuts just for two questions, please will some one help me?

What two continents are located on a single landmass? Together, what are they called?

What lines measure distances east and west of the Prime Meridian on a globe or a map?

2007-09-20 11:49:29 · 7 answers · asked by sweetNnasty 1 in Geography

2007-09-20 11:48:25 · 3 answers · asked by James F 1 in Mathematics

I needed to find the zeros of this polynomial:

1/4(t2-2t+15)

So, I graphed it, and there are none.

How do I show this algebraically?

Thank you.

2007-09-20 11:47:14 · 7 answers · asked by baileyo 2 in Mathematics