Science & Mathematics - 26 November 2007

2007-11-26 08:53:19 · 2 answers · asked by Anonymous in Mathematics

highway safety engineers can use the formula
d= 0.05s^2+1.1s to estimate the minimum stopping distance d in the feet for a vehicle traveling s miles per hour. If a car is able to stop after 125 ft. what is the fastest it could have been traveling when the driver first sppled the brakes?

2007-11-26 08:50:02 · 4 answers · asked by andy l 1 in Mathematics

2007-11-26 08:49:29 · 3 answers · asked by Po 5 in Biology

what is 83 cm, in inches ?

2007-11-26 08:49:23 · 0 answers · asked by Anonymous in Mathematics

Zinc and sulfur react to form zinc sulfide, according to the reaction: 8Zn + S8 ---->8ZnS

a) If 2.00 moles of Zn are heated with 1.00 moles of S8, identify the limting reactant.

b) How many moles of excess reactant remain?

c) How many moles of product are formed?

2007-11-26 08:48:05 · 5 answers · asked by Caramel 2 in Chemistry

i have not been given anything or told anythign for that sake...i need 2 find teh internal resistance of a solar cell and vary the light intensity if i have time... i dont understand how to go about it..what to use..the digital meter???? e.t.c plz help me as soon as possible..thank you very much...n oh yh plz explain it in laymen terms :D thank you so much

2007-11-26 08:47:06 · 2 answers · asked by BaByXx L 1 in Physics

5 cm/min = __ m/week
answerwith work
thanx

2007-11-26 08:46:20 · 4 answers · asked by Saya 2 in Mathematics

| x + 12 | > 36

What can X be to make that statement true?

2007-11-26 08:42:31 · 4 answers · asked by Anonymous in Mathematics

This equlilibrium state of affairs contiued for quite a while until on January 1 2006 the farmer fixed the holes in the fence, so that foxes could no longer enter.

How many rabbits will be there on January 1, 2008?

2007-11-26 08:40:46 · 4 answers · asked by Alexander 6 in Mathematics

a. longitudinal lines.
b. latitude lines

2007-11-26 08:40:24 · 5 answers · asked by Anonymous in Geography

a. Geologists
b. Cartographers
c. Radiologists

2007-11-26 08:39:36 · 5 answers · asked by Anonymous in Geography

2007-11-26 08:39:35 · 3 answers · asked by cerelac 2 in Physics

Why can a rocket accelerate into space when the force of takeoff remains the same?
-the rocket is on a launch pad

2007-11-26 08:39:00 · 5 answers · asked by Anastasia B 2 in Physics

Simplify (-7x-14)/(10x+20)

2007-11-26 08:37:43 · 9 answers · asked by Anonymous in Mathematics

a) for what values of x ∈ R is the expression defined?

b) for what values of x ∈ R is the expression = 0?

c) for what values of x ∈ R is the expression > 0?

d) for what values of x ∈ R is the expression < 0?

e) give a sign chart for the expression.

2007-11-26 08:36:10 · 1 answers · asked by lexcollect 1 in Mathematics

I understand how to foil and everything, (A+B)(C+D) = AC+AD+BC+BD...

but I just received a question that doesn't work with this method.
(t+1)(t[sqared] - t +1)
There are three coefficients in the second set and I do not know what to do.

2007-11-26 08:35:35 · 10 answers · asked by Barron 2 in Mathematics

I have to describe in complete sentences the steps to be taken in order to solve the log equation.

2007-11-26 08:34:18 · 6 answers · asked by Anonymous in Mathematics

2007-11-26 08:31:11 · 3 answers · asked by alexxandra_1 1 in Physics

Part 2: An application of a rational function is T = (AB)/(A+B), which gives the time, T, it takes for two workers to complete a particular task where A & B represent the time it would take for each individual worker to complete the identical task.

a) The monthly reports are due and the department manager has decided to try and accelerate the completion of the report by assigning a team of two workers the task. Mary has completed the monthly reports in an average of 6 hours over the past few months. John, who had worked in Mary's capacity prior to a change in assignments, used to complete the task in 8 hours. How quickly will Mary and John finish the report if they work together?

b) The very next month, both Mary and John are out sick. The manager knows that Skip can do the reports in 12 hours working alone, but the manager needs the work done in 4 hours. He needs to choose a staff member to work with Skip. How quickly would the other staff member have to complete the report working alone if the two hope to complete the report in 4 hours?

2007-11-26 08:30:27 · 3 answers · asked by dc 1 in Mathematics

I just think it's crazy that everyone is panicking and so far there has been no PROOF about the world ending. Why would the world end when the calender ends? I just don't see what the hype is about. PLEASE NO RUDE COMMENTS. THIS IS JUST MY OPINION.

2007-11-26 08:29:56 · 28 answers · asked by UnboundClouds 5 in Astronomy & Space

Okay. Normally i know how to find the maxima or minima but for some reason this one is throwing me off.. Can i get some help?

y=5x^2 + x

Please and Thank you!

2007-11-26 08:28:55 · 3 answers · asked by chelsie r 2 in Mathematics

>I A< the 1st letter of the alphabet >M< the 13th letter of the Alphabet 1+9+13=23
Ex 3:14 "I am who I am." Tell them "I AM" sent you....
What about you do you know 23?

2007-11-26 08:26:37 · 20 answers · asked by Anonymous in Mathematics

One inch of rain typically yields 10 inches of snow (Though this varies depending on the density of the flakes so less rain can produce more snow.)

This is not impossible.

2007-11-26 08:24:24 · 2 answers · asked by Dylan 2 in Mathematics

preferably articles about theoretical physics, but any input would be appreciated

2007-11-26 08:21:09 · 3 answers · asked by Complete and Total Idiot 3 in Other - Science

Ok there is only 19 days left in the semester.I have an A in all my other classes.I have 2 test left and a project. The project can bring me up to a 65. However I still have to get a 70 to pass. My record of taking test in this class is sadly abysmal. I am truly worried as I will get kicked out of my Honor classes if I fail math.What can I do I tried tutors, I spoke with my teacher, yet I still fail. The test are truly difficult for me. Yet I understand the material. I am in 9 grade and honestly this is seriously stressing me. I was a good Algebra student but geometry just agitates me.

2007-11-26 08:19:30 · 6 answers · asked by Anonymous in Mathematics

math, simplify

2007-11-26 08:16:51 · 4 answers · asked by Dee Dee 1 in Mathematics

i have this stoichiometry question that ive completed but for some reason i dont think that i have the right answer

how many grams of magnesium metal will completely reasct with 50 g of phosporic acid?
Mg+H3PO4
M? 50g
24.31g/mol 98g/mol

n H3PO4= 50g * (1mol/98g) =0.5102mol
n MG= 0.5102mol *(1mol/1mol) = 0.5102mol
M MG= 0.5102 mol *(21.31g/1mol) = 12.43g

also if someone could help me understand molar ratios i would really appriciate it
thanks

2007-11-26 08:16:10 · 1 answers · asked by Anonymous in Chemistry

math. simplify

2007-11-26 08:15:50 · 5 answers · asked by Dee Dee 1 in Mathematics

A uniform solid sphere with a mass of M = 5.0 kg and radius R = 20 cm is rolling without
slipping on a horizontal surface at a constant speed of 5.0 m/s. It then encounters a ramp, and
proceeds to roll without slipping up the ramp. The goal of this problem is to determine the
maximum height reached by the sphere on the ramp before it turns around, and to use
conservation of energy to do so. Use g = 10 m/s2.

(a) Write out expressions for the remaining terms. Remember to account for both
translational kinetic energy and rotational kinetic energy, if appropriate. Keep everything in
terms of variables.

(b)How far does the sphere roll up the ramp (measuring the vertical distance)? First
find an expression for this distance in terms of variables, simplified as much as possible, and
then plug in the appropriate values.

(c) If a block slides without friction up the ramp, starting at the bottom with the same
initial speed as the sphere, which object travels farther up the ramp

2007-11-26 08:13:17 · 1 answers · asked by yep 1 in Physics

How do I verify an identity? The problem is:

tan2(theta) + cot2(theta) / sec2(theta) = csc2(theta)

2007-11-26 08:10:54 · 2 answers · asked by Anonymous in Mathematics