Science & Mathematics - 8 November 2006

I know if there is a negative number it means a reaction is exothermic, but for instance antifreeze, i've gotten a negative number. is this right?

2006-11-08 14:52:03 · 3 answers · asked by z m 3 in Chemistry

2006-11-08 14:51:22 · 7 answers · asked by chriskingwong 1 in Mathematics

I really could use some help on this problem. Thanks for any help on it! This is a college physics problem.

If the system (shown in the figure linked below) is set in rotation about each of the axes listed below, find the torque that will produce an angular acceleration of 2.7 rad/s2 in each case.

http://www.webassign.net/sercp/p8-29.gif

____ N x m (x axis)
____ N x m (y axis)
____ N x m (axis through O and perpendicular to the page)

2006-11-08 14:51:10 · 3 answers · asked by Amara 1 in Physics

I had jus finished eating most of a bowl full of cereal, when I discovered it had several dead ants in it. I fear that I may have eaten quite a bit of these feral insects. The thing is, I didn't notice them at the beginning because it was a chocolate flavored cereal and I didn't pay much attention to these little dark bits floating around. Boy was I surprised when I looked a little closer!!!!!

2006-11-08 14:51:01 · 4 answers · asked by Anonymous in Zoology

2006-11-08 14:49:16 · 8 answers · asked by Cecilia D 1 in Mathematics

a) Exhibit a type III survivorship curve
b) Exhibit a type II survivorship curve
c) Have a population size close to carrying capacity
d) Are found in disturbed areas
e) Are small bodied

2006-11-08 14:48:47 · 1 answers · asked by Anonymous in Zoology

Find the coordinates of the point P on the curve
y=64/(x^2) for x>0

where the segment of the tangent line at P that is cut off by the coordinate axes has its shortest length.

2006-11-08 14:48:37 · 2 answers · asked by thesekeys 3 in Mathematics

2006-11-08 14:48:32 · 4 answers · asked by Taylor S 1 in Geography

A cone-shaped paper drinking cup is to hold 55 of water. Find the height, , and radius of the cup, , that will require the least amount of paper.

Carry out all calculations exactly, round to 2 decimal places the final answer only.

2006-11-08 14:45:52 · 2 answers · asked by thesekeys 3 in Mathematics

I had jus finished eating most of a bowl full of cereal, when I discovered it had several dead ants in it. I fear that I may have eaten quite a bit of these feral insects. The thing is, I didn't notice them at the beginning because it was a chocolate flavored cereal and I didn't pay much attention to these little dark bits floating around. Boy was I surprised when I looked a little closer!!!!!

2006-11-08 14:45:15 · 11 answers · asked by Anonymous in Zoology

I'm not even sure where to begin.

To help study damage to an aircraft that collide with birds you design a test gun that will accelertae chicken sized objects so that their displacement along the gun barrel is given by
X=(9.0*10^3m/s^2)t^2-(8.0*10^4m/s^3)t^3
The object leaves the end of the barrel at t=0.03 s.

a) How long must the gun barrel be.
b) What will be the speed of the object as they leave the end of the barrel.
c)What net force must be exerted on a 1.5kg object at t=0.03s.

2006-11-08 14:43:48 · 2 answers · asked by lpfanz89 1 in Physics

ok i have to do and extra credit thing in science -bout minerals and i need to know what the pyramids are made out of.i cant find it anywhere! i looked an google,yahoo,and ask! so help! please!

2006-11-08 14:43:29 · 10 answers · asked by **HUGS AND KISSES** 1 in Earth Sciences & Geology

2006-11-08 14:42:21 · 2 answers · asked by Anonymous in Earth Sciences & Geology

Suppose a manufacturer can sell x items per week at a price p(x) = 200 - 0.01*x cents, and that it costs C(x) = 50*x + 20,000 cents to produce the x items. What is the production level for maximum profits?
(My Calculus professor put this question on the board this morning and I could not understand her explanation at all! Maybe I was too tired, but her accent is just tooo thick. I also am having trouble understanding the wording. Thanks for the help!!)

2006-11-08 14:41:46 · 3 answers · asked by thesekeys 3 in Mathematics

how should linearized acceleration vs. mass graph be equivalent to the net force? and how can the slope of the acceleration vs. net force graph be equivalent to one over the mass? please explain (in simple terms due to continually brain damage for the last few weeks @_@)
would be thankful for any answers

2006-11-08 14:41:08 · 2 answers · asked by mooshie 1 in Physics

An elevator in a tall building is allowed to reach a maximum speed of 3.3 m/s going down. What must the tension be in the cable to stop this elevator over a distance of 3.5 m if the elevator has a mass of 1320 kg including occupants?

2006-11-08 14:40:13 · 3 answers · asked by Emily J 1 in Physics

~
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if it shows up wrong it is a """~""" above an equal sign

2006-11-08 14:37:53 · 11 answers · asked by Anonymous in Mathematics

The sun's output of visible light stays pretty steady, it stays within 1% of its current value for the past 100 years or so. However, the sun's maximum X-ray output can be as much as 10 times greater than its minimum output. WHY CAN THE CHANGES IN X-RAY OUTPUT BE SO MUCH MORE PRONOUNCED THAN THOSE IN THE OUTPUT OF VISIBLE LIGHT?

2006-11-08 14:36:34 · 2 answers · asked by hunnk33 1 in Astronomy & Space

a) 389.0 ml
b) 38.9 ml
c) .389 ml
d) 38900.0 ml

2006-11-08 14:35:37 · 14 answers · asked by Anonymous in Chemistry

4x + 2y - z = 4
2x - 3y + 2z = 4
x + y - z = -1

solve for each variable and plz leave a step by step answer! thanks alot, i think algebra II is really hard

thanks for all the help!!

2006-11-08 14:35:04 · 5 answers · asked by GorGeOuS 3 in Mathematics

http://www.blairstripsteel.com/map%20north%20america.jpg
Where??

2006-11-08 14:35:03 · 11 answers · asked by Dumb American 1 in Geography

Date, name (meaning) and country. Not so difficult (for old-timers).....................

2006-11-08 14:33:23 · 7 answers · asked by Rachmonskikaya1289 2 in Astronomy & Space

A 31.0 kg block is connected to an empty 1.00 kg bucket by a cord running over a frictionless pulley (Fig. 4-57). The coefficient of static friction between the table and the block is 0.425 and the coefficient of kinetic friction between the table and the block is 0.320. Sand is gradually added to the bucket until the system just begins to move.

2006-11-08 14:33:06 · 2 answers · asked by Emily J 1 in Physics

rocks that are melted by heat and pressure. ( starts with an m and has 5 letters

force that flattens mineral grains into layers ( starts with a p and has 8 letters)

thank u sooooooooo much!

2006-11-08 14:32:46 · 2 answers · asked by sup yo 5 in Earth Sciences & Geology

A bicyclist can coast down a 5° hill at a constant 5.0 km/h. Assume the force of friction (air resistance) is proportional to the speed v so that Ffr = cv.

(b)What is the average force that must be applied in order to descend the hill at 18 km/h? The mass of the cyclist plus bicycle is 76 kg.

2006-11-08 14:32:02 · 2 answers · asked by Emily J 1 in Physics

Two particles, A and B, are in motion in the xy-plane. Their coordinates at each instant of time (t >= 0) are given by x_A = t, y_A = t^2, x_B = 2*t, and y_B = 2. Find the minimum distance between A and B. Please round your answers to two decimal places
(Studying for my Calculus midterm! This is a problem from the book, can't figure it out. Thank you!)

2006-11-08 14:31:18 · 2 answers · asked by thesekeys 3 in Mathematics

What is 20% of $96.00 and how do i do this on a calculater

2006-11-08 14:31:06 · 10 answers · asked by bamafan3414 1 in Mathematics

2006-11-08 14:28:28 · 2 answers · asked by jsnkbl 1 in Mathematics

2006-11-08 14:25:30 · 10 answers · asked by Jessica G 1 in Botany

2006-11-08 14:25:05 · 9 answers · asked by kam0361 1 in Physics