Science & Mathematics - 7 October 2007

1. f(x)= tan(3^x) has an interval in [0, 1.4] what's the derivative at this point.
2. consider the curve: 2y^3+6x^2y-12x^2=6y=1
dy/dx=(4x-2xy)/(x^2+y^2+1)
...write an equation of each horizontal tangent line to the cruve.
...the line through the origin with a slope of -1 is tangent to the curve at point p. find the x- and y-coordinate of point p.

2007-10-07 08:23:13 · 1 answers · asked by ix0heartx0u 1 in Mathematics

...as opposed to crystals which just sink to the bottom and diffuse. This is what I observed in one of our biology experiments (on diffusion) with dark green ink(ink from a pen actually).

2007-10-07 08:21:34 · 6 answers · asked by kim p 2 in Other - Science

2007-10-07 08:20:25 · 8 answers · asked by Anonymous in Mathematics

A stone is thrown vertically upward from the top of a house 60 feet above the ground with the initial velocity of 40 ft/sec.

a) At what time will the stone reach its maximum height?
b) What is its greatest height?
c) How long will it take the stone to pass the top of the house on its way down?
d) What is the velocity at that instant?
e) How long will it take the stone to strike the ground?
f) What is the velocity when it strikes the ground?

2007-10-07 08:14:07 · 1 answers · asked by daaznone90 2 in Mathematics

i need some SERIOUS help on those two-column proofs, statement and reasons things!! I DO NOT GET THEM AT ALL!! i asked my teacher, my friends (which all kinda gave up on me because I didn't get how to do it no matter how well they explain)
I'm starting to lose all hope... and theres a test on it tomorrow
O_o

i'm pretty sure asking about it here isn't going to help me much either, but ehhh i'll try it anyways and pray someone out there could help me..

Here's one of the problems from my homework:
http://i24.tinypic.com/m9svw1.jpg

please teach me how to figure it out step by step and please be as specific as you possibly can!

2007-10-07 08:12:50 · 3 answers · asked by BLEH 1 in Mathematics

I have an experiment in which I have to calculate the time it takes for a weight to falls a certain distance and I would like to know what the type of sensor I could use.

Due to the procedure of the experiment I need the sensor to detect a particular part of the weight and for this reason an object( i dont know what) could be attached to the weight. Could I use an infra red sensor that measures the temperature of this specific object which is attached to the weight?

If not what else?

Thank You

2007-10-07 08:11:20 · 3 answers · asked by Anonymous in Physics

Why are LEDs so much more efficient at converting energy to light than incandescent and flourescent lights? What goes on in the internal workings of an LED that is different from a normal bulb?

2007-10-07 08:10:04 · 1 answers · asked by Dave B. 7 in Other - Science

3/5*4*10-6=18

insert parenthesis and other grouping symbols in the appropriate place to make a true statement.

2007-10-07 08:07:59 · 7 answers · asked by grace 1 in Mathematics

I have to research this virus for biology class and I've been completely unable to find information about this. This is a purely scientific question, from what source does the virus get its energy?

2007-10-07 08:06:55 · 4 answers · asked by Amy 2 in Biology

2007-10-07 08:06:38 · 8 answers · asked by math 1 in Mathematics

its weird

2007-10-07 08:04:44 · 14 answers · asked by john b 1 in Astronomy & Space

clogs in plumbing.

2007-10-07 08:03:46 · 1 answers · asked by Maria D 1 in Chemistry

What is the definition of chromatography?

2007-10-07 08:02:49 · 2 answers · asked by ¿¿ANswER♠?? 3 in Chemistry

Rex rode his bicycle 300 kilometers. Three tires were used equally in accumulating this distance. How many kilometers of wear did each tire sustain?

2007-10-07 08:02:33 · 11 answers · asked by Brian M 1 in Mathematics

my options are a. no solution b. 0 c. 1 d. identify (don't even know what that means

2007-10-07 07:52:24 · 8 answers · asked by me 1 in Mathematics

The formula g(x) = 5/9 (x - 32) is used to convert from x degrees Fahrenheit to y degrees Celsius. Can you explain how to show that f and g are inverse functions?

2007-10-07 07:50:51 · 2 answers · asked by damasta_007 1 in Mathematics

There are lots of different types of birds, crabs, fish including many species of whales, sharks, dolphins etc.

Why arent their humans that are a bit different in the way they are eg, humans with eyes in the back of their heads, humans that eat wood, men that get pregnant, people with both types of genitals, really big supreme humans with shiny red helmets???

2007-10-07 07:43:47 · 11 answers · asked by sugarplop9 1 in Biology

I'm just about reading an article in Miami Herald online, where it says a company is at center of controversy, as it wants to spread 100 tons of pulverized iron over a carbon dioxide- gobbling plankton near Galapagos Island in the Pacific Ocean. They say the experimental technique, which is called "iron-seeding" would be like a "tonic" for the enviromental epidemic of collapsing fisheries, ocean acidification, and global warming.

If it's succesful, the company will benefit by selling "carbon-offset" credit to industrial polluters.

How safe can this be? Up till now their voyage has been postponed repeatedly because of questions from scientists, enviromentalists, and government regulators. But they're expected to be off to sea any day now!!!

2007-10-07 07:42:26 · 3 answers · asked by 1-2informationalways 1 in Earth Sciences & Geology

perform the indicated operation

2007-10-07 07:41:07 · 6 answers · asked by Anonymous in Mathematics

power is generated. The overall efficiency of the turbine-generator is 80 percent. Disregarding frictional losses in piping, estimate the electric power output of this plant.

2007-10-07 07:40:57 · 1 answers · asked by s4_orce 1 in Engineering

I am really confused on this question. Could someone please assist me? Thank you!

An Olympic skier moving at 11 m/s down a 18 degree slope encounters a region of wet snow of coefficient of kinetic friction of mu = .36. The acceleration of gravity is 9.8 m/s^2. How far down the slope does she travel before coming to a halt? Answer in units of m.

2007-10-07 07:38:52 · 1 answers · asked by sg88 1 in Physics

solve on the interval 0 < equal to theta < 2pi


D) cos(2theta) = 2 - 2 sin^2 theta

E) cos (2theta) + 5 cos theta + 3 = 0


please help and explain, thanks!!

2007-10-07 07:38:27 · 1 answers · asked by Anonymous in Mathematics

okay well i had 100 homework problems and i couldnt get these ones..so please help me and show the work and tell me how you got it..like explain so i can understand..thanks so SO much ..greatly appreciated..10 points to most accurate answer!


ORDER THE NUMBERS FROM LEAST TO GREATEST : 3and39/40 (fraction), 3 and 19/20(fraction), 3and 1/2(fraction)
a. 3and39/40 ,3and 1/2,3 and 19/20
b. 3and 1/2,3 and 19/20,3 and39/40
c. 3 and 19/20, 3 and39/40, 3and 1/2

NAME THE PROPERTY
7+(4+4)=(7+4)+4
a. inverse property of addition
b. associative property of addition
c.commutative property of multiplication

2= 10+z divided by -3.(negative 3)
please show work!
a.-4
b.-16
c.-5

WHICH EQUATION IS AN IDENTITY?
a.11-(2v+3)=-2v-8
b. 5w+8-w=6w-2(w-4)
c. 7m-2=8m=4-m

2007-10-07 07:36:32 · 3 answers · asked by Anonymous in Mathematics

Assume you are a medieval knight attacking a castle with a cannon. The ball leaves the cannon with a speed of 49.3 m/s. The barrel's angle with respect to the ground is 44.5 degrees, and you make a perfect hit on the tyrant's chamber which is at the same level as the cannon's muzzle (H=0 m). What is the time of flight of the cannon ball?

2007-10-07 07:36:01 · 2 answers · asked by Anonymous in Physics

2007-10-07 07:35:52 · 3 answers · asked by Fizz 1 in Earth Sciences & Geology

A gas-filled weather balloon with a volume of 51.5 L is released at sea-level conditions of 755 torr and 23°C. The balloon can expand to a maximum volume of 760. L. When the balloon rises to an altitude at which the temperature is -5°C and the pressure is 0.059 atm, what will be the final volume of balloon?

2007-10-07 07:33:17 · 2 answers · asked by Anonymous in Chemistry

In the case of NaI and Pb(NO3)2, which forms a yellow precipitate, what effect will it have on the reaction if you pour NaI INTO Pb(NO3)2 instead of pouring Pb(NO3)2 INTO NaI?

2007-10-07 07:33:08 · 3 answers · asked by me 3 in Chemistry

-pi(sinpix)= 0
What two ansers should i get? i got x=0 for sinpix and -pi will never equal zero

2007-10-07 07:32:08 · 9 answers · asked by Anonymous in Mathematics

2007-10-07 07:31:00 · 1 answers · asked by Mr. Problem 1 in Mathematics

Linda and Dave leave simultaneously from the same starting point biking in opposite directions. Linda bikes at 7 miles per hour and Dave bikes at 9 miles per hour. How long will it be until they are 24 miles apart from each other?

a. 12 hrs
b. 2 / 3 hrs
c. 8 / 21 hrs
d. 1 1 / 2 hrs

2007-10-07 07:30:59 · 5 answers · asked by . 1 in Mathematics