Science & Mathematics - 6 November 2007

A 20.0 kg box rests on a table. What is the weight of the box and the normal force acting on it? A 10.0 kg box is placed on top of the 20.0 kg box. Determine the normal force that the table exerts on the 20.0 kg box and the normal force that the 20.0 kg box exerts on the 10.0 kg box.

Please show/explain work clearly.

2007-11-06 10:39:11 · 1 answers · asked by Kantilal P 1 in Physics

2007-11-06 10:39:01 · 25 answers · asked by Anonymous in Biology

2007-11-06 10:37:29 · 9 answers · asked by Anonymous in Parapsychology

do you know any defense mechanisms that tigers use in the wild cause i have a college project i NEED to finish and it would be great for some help.

2007-11-06 10:37:22 · 7 answers · asked by Anonymous in Zoology

A farmer has 160 meters of fencing and he wants to build a rectangular enclosure for the chickens, using a hedge as one side of the rectangle. What is the maximum area of such an enclosure?

2007-11-06 10:36:25 · 3 answers · asked by Kerrzy 1 in Mathematics

Find the common sulution for each system of equations . Check each solution.


1) 2x + y = 4 2x + 3 = 0 _________
2) 2x + y + 0 x - y = 1 _________
3) 3x + 4y = -11 7x - 5y = 3 _________
4) 2x + y = -1 -2x + y = 3 _________
5) 3x - 5y = 4 4x + 3y = 15________
6) 3x - 2y = 5 -4y + 3y = 1________
7) 3x -4y = 5 5x + 4y = 3 ________
8) 4x = 3y - 10 2y = 22 - 5x________
9) 2x + 6y = 14 3x - 4y = -5________
10) 1/2y = 2 - 2x 6x = y + 1 _________

2007-11-06 10:35:13 · 2 answers · asked by erikjjjacob 1 in Mathematics

I need help..
Thanks!

2007-11-06 10:32:13 · 2 answers · asked by Anonymous in Chemistry

2007-11-06 10:30:05 · 1 answers · asked by tash 1 in Mathematics

Okay y'all, I read all the silly answers from before - now I want the people who are serious. What did you see? Where did you see it? What did it look like? How did it behave? Did it see you, chase you, attack you?

2007-11-06 10:30:01 · 13 answers · asked by tarot_frog 3 in Paranormal Phenomena

2007-11-06 10:28:58 · 1 answers · asked by Jen P 1 in Chemistry

1) 7/8 divided by 1/4

2) ab/c divided by a/bc

2007-11-06 10:25:19 · 2 answers · asked by erikjjjacob 1 in Mathematics

belongs to which functional group?
Transferases? or lyase?

2007-11-06 10:22:11 · 3 answers · asked by sweetgirl78228 2 in Chemistry

2007-11-06 10:21:10 · 1 answers · asked by damigurl05 1 in Biology

2007-11-06 10:20:18 · 1 answers · asked by damigurl05 1 in Biology

A printer prints documents at a rate of 12 pages per minute.A copier copies a total of 10 pages per minute

write and solve an equation to find the time it takes to print a 24 page reasearch paper

2007-11-06 10:19:55 · 4 answers · asked by -ForeverrYoung♥* 3 in Mathematics

2007-11-06 10:18:48 · 1 answers · asked by damigurl05 1 in Biology

help me!!!!!!!

2007-11-06 10:18:47 · 1 answers · asked by Anonymous in Chemistry

A student determines the mass of a rock to be 196 grams, but the actual mass of the rock is 200 grams. The student's approximate percent deviation (percentage of error) is:

2007-11-06 10:18:29 · 4 answers · asked by musichick243 2 in Mathematics

Solve each equation for y when the value of x is given.

1) y= 4x - 6; x= 1

2) y= 4x - 2; x= -1

2007-11-06 10:18:11 · 3 answers · asked by erikjjjacob 1 in Mathematics

How many kilojoules of energy woulb bee needed to fill a swimming pool with the dimensions 12 ft x 3 ft x 8 ft if you want the temp to increase from 26C to 30C Steps included!!

2007-11-06 10:17:52 · 1 answers · asked by emblimegreen 4 in Mathematics

In the hydrogen atom, what is the physical significance of the state for which n = infinity and E = 0?

2007-11-06 10:16:49 · 2 answers · asked by hahahahahaha 1 in Chemistry

I sneezed and heard something plop on the ground, having trouble finding it...

2007-11-06 10:15:37 · 20 answers · asked by Anonymous in Biology

someone please help. I suck at fractions.

2007-11-06 10:14:54 · 5 answers · asked by [jayjay] 1 in Mathematics

im doing a review packet for a test and i cant find the ACTUAL definition for
1. element
2. compound.
Please help. thanks ;)

2007-11-06 10:14:50 · 2 answers · asked by Anonymous in Chemistry

what do the different types of clouds look like

2007-11-06 10:13:46 · 4 answers · asked by austin.bell 1 in Weather

2007-11-06 10:13:07 · 1 answers · asked by Anonymous in Earth Sciences & Geology

thanks

2007-11-06 10:10:26 · 5 answers · asked by Ak 1 in Mathematics

I need help people. I have some land, and i think its a trapezoid, although i dont need to know the height. Im trying to work out the area in square meters. Heres the info: Side A is 34.5 meters long, Side B is 25 Meters long, Side C is 37 meters and side D is 25.5 meters long. Whats the total area in Square Meters?

2007-11-06 10:08:58 · 7 answers · asked by chris_p26 3 in Mathematics

i want to know how they freeze and when.

2007-11-06 10:07:46 · 19 answers · asked by Brianna s 1 in Weather

A car travels at a constant rate at 45 miles per hour. find the amount of time it takes the car to travel 180 miles

2007-11-06 10:01:29 · 4 answers · asked by Anonymous in Mathematics