Science & Mathematics - 14 December 2007

help me i need this for my science question

2007-12-14 02:48:09 · 5 answers · asked by xxrandomazngurlxx 1 in Chemistry

how do i find the derivative of this function??

f(x) = e^2x * cos(4x)

2007-12-14 02:47:14 · 4 answers · asked by Britney 1 in Mathematics

A person's body is producing energy internally due to metabolic processes. If the body loses more energy than metabolic processes are generating, its temperature will drop. If the drop is severe, it can be life-threatening. Suppose a person is unclothed and energy is being lost via radiation from a body surface area of 1.38 m2, which has a temperature of 34°C and an emissivity of 0.700. Suppose that metabolic processes are producing energy at a rate of 103 J/s. What is the temperature of the coldest room in which this person could stand and not experience a drop in body temperature?

2007-12-14 02:44:03 · 1 answers · asked by ncote119 1 in Physics

-a ball rolling up on a inclined plane.
-a car ascends a steep hill.
-a girl jumps down from a bed
-water is forced upward through a pipe.
-a crate rests at the bottom of an inclined plane.

2007-12-14 02:42:21 · 2 answers · asked by fivefootzero 2 in Physics

The sky actually cleared up lastnight! We saw so many we couldnt even count! Anyone else see a lot?

2007-12-14 02:37:11 · 9 answers · asked by Jen 5 in Astronomy & Space

Was told to get the alkalinity adjusted first. Then adjust the pH. When I get the pH right, then the alkalinity is low. When I get the alkalinity right, the pH is too high. Can't seem to get a good balance of both. By the way, I use Bromine for a chlorinator.

2007-12-14 02:32:00 · 2 answers · asked by ringerman50 1 in Chemistry

If 8x + 5x + 2x + 4x = 114, then 5x + 3=?????

If you can also tell me how you figured it out? I don't understand Algebra either! GED test tomorrow, I know Algebra is on there.. Also if you have any helpful hints for me to jog my memory it's been YEARS (over 10) since I have been in school!! I know there are simple formula's to figure out x but I can't remember.. Thanks all!!! I want to get in college for Winter, but have to pass this test tomorrow!!! Keep your fingers crossed!!!

2007-12-14 02:30:45 · 14 answers · asked by Can't stand this 4 in Mathematics

if so will we if be able one day use it travel out of our solar system

2007-12-14 02:22:18 · 9 answers · asked by Anonymous in Astronomy & Space

2007-12-14 02:15:44 · 3 answers · asked by Anonymous in Chemistry

Two cars are approaching an intersection. One is 4 miles south of the intersection and is moving at a constant speed of 50 miles per hour. At the same time, the other car is 5 miles east of the intersection and is moving at a constant speed of 60 miles per hour.

(a) Express the distance d between the cars as a function of time t.

HINT GIVEN: At t = 0, the cars are 4 miles south and 5 miles east of the intersection, respectively.

Sorry, but this hint does not make sense to me. I need someone to solve this question step by step explaining as you go through the problem. Okay?

2007-12-14 02:13:03 · 5 answers · asked by journey 1 in Mathematics

I need help, I don't understand this at all! I want to use Orange Juice. So what do I do? Ten points to the first person that can help me!

Find the hydrogen ion content of a substance of your choice.
Using this hydrogen ion content, show how to find the pH of the substance using the formula. Is this substance acidic or basic? Why?
Round the pH to three decimal places.

2007-12-14 02:12:42 · 1 answers · asked by cupnnas2002 3 in Chemistry

2007-12-14 02:10:38 · 3 answers · asked by Anonymous in Mathematics

I know that Cor-ten B is equivalent to a588, but is it a588 grade a, a588 grade b or a588 grade c? Where does it say this?

Thanks!

2007-12-14 02:09:25 · 4 answers · asked by Shant 2 in Engineering

If you preferred that the value of "a" be between 0 & 1 or larger than 1 with an explanation of your reasoning. Please help me answer this. That goes with the Rule of 72. How does it fit in with calculating interest.? Thanks.

2007-12-14 02:08:54 · 1 answers · asked by dc 1 in Mathematics

Where do you come from. It is a unusual surname. I'm led to beleive that it means Enemy's by arrows.

2007-12-14 02:06:19 · 2 answers · asked by Anonymous in Geography

2007-12-14 02:02:37 · 12 answers · asked by Thorn & Croxson M 2 in Astronomy & Space

2007-12-14 01:59:10 · 9 answers · asked by Anonymous in Astronomy & Space

What is the kinetic energy of an automobile with a mass of 1040 kg traveling at a speed of 13.4 m/s?

and

What speed would a fly with a mass of 0.65 g need in order to have the same kinetic energy as a 1250 kg automobile traveling at a speed of 11 m/s?

and

A 65.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1250 N. If the diver comes to rest 4.0 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?

2007-12-14 01:55:30 · 1 answers · asked by Anonymous in Physics

6k - 8 - 4k = 6

k=?

16= 2 (s + 9) - 4
s=?

and

2= 3-4t/5

t=?

2007-12-14 01:55:00 · 5 answers · asked by icanseethevenominyoureyes 1 in Mathematics

2007-12-14 01:54:03 · 22 answers · asked by Joe M 2 in Agriculture

Does anyone have a link to videos of the Apollo Soyuz Test Project? I need something showing the process of the rendezvous in space. I know there are some out there but have been unable to locate them. If anyone could post all of the links they can find that would be wonderful!

10 points goes to best answer! The more clips the better. Also, please cite your source. =)

Thank you!

2007-12-14 01:53:34 · 4 answers · asked by Anonymous in Astronomy & Space

how do i find the limit here?

lim (x+6) / (x^2-36)
x->6

2007-12-14 01:52:13 · 3 answers · asked by Ashley 1 in Mathematics

A spring has a force constant of 430.0 N/m.

(a) Determine the potential energy stored in the spring when the spring is stretched 4.16 cm from equilibrium.
J
(b) Determine the potential energy stored in the spring when the spring is stretched 3.32 cm from equilibrium.
J
(c) Determine the potential energy stored in the spring when the spring is unstretched.
J

2007-12-14 01:51:42 · 2 answers · asked by Anonymous in Physics

A 2.1 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 0.81 m, and the height of the room is 3.00 m.

(a) What is the gravitational potential energy associated with the ball relative to the ceiling?
J
(b) What is the gravitational potential energy associated with the ball relative to the floor?
J
(c) What is the gravitational potential energy associated with the ball relative to a point at the same elevation as the ball?
J

2007-12-14 01:50:39 · 3 answers · asked by Anonymous in Physics

Does anyone have a link to videos of the Apollo Soyuz Test Project? I need something showing the process of the rendezvous in space. I know there are some out there but have been unable to locate them. If anyone could post all of the links they can find that would be wonderful!

Thank you!

2007-12-14 01:47:29 · 2 answers · asked by Anonymous in Astronomy & Space

2007-12-14 01:45:32 · 9 answers · asked by Autumn 1 in Astronomy & Space

A 64.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1060 N. If the diver comes to rest 5.9 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?
m

2007-12-14 01:43:05 · 2 answers · asked by Anonymous in Physics

Why Is The Varible "M" Used To Represent Slope?

2007-12-14 01:41:42 · 4 answers · asked by Anonymous in Mathematics

2007-12-14 01:41:17 · 12 answers · asked by Anonymous in Astronomy & Space

1.) find the instantaneous rate of change in temperature with respect to time.

T(t) = (4t) / (t^2+1) + 98.6


2.) find the rate of change at t = 2 hours

2007-12-14 01:38:30 · 3 answers · asked by Nicole 1 in Mathematics