Science & Mathematics - 11 October 2007

Physicist Phil was driving aroud a flat curve at 9.1m/sec. Being a physicist, he knew that if he went around the curve at the maximum speed which would allow him to stay on the road, then the static force (F (little a)) would equal the centripital force (F (little c)). If (F (little a)) = 5.209m m/sec^2, (F (little c)) = mv^2/r m/sec^2, Phil's car has a mass, m, of 800 kg, the radius, r, of the curve is 75m, and v is the speed of the car in m/sec, how much faster, in m/sec, could Phil go and still stay on the road? Give your answer rounded to four significant digits.

2007-10-11 15:15:19 · 1 answers · asked by JewJitsu 2 in Mathematics

triangle PQR is similar to triangle PST. Given point P at (0,0), Q at (1,2), R at (2,2), and S at (2,4). Find 2 possible locations at T in exact answers. i know that one point is at (4,4). how do you find the other one in fraction form, without calculator.

I know it is not (2,6)
i think it is a fraction.

2007-10-11 15:15:04 · 7 answers · asked by worthlessstuff 1 in Mathematics

A man who is heterozygous for Huntington's Disease marries a normal woman. What percent of their offspring will be normal? What percentage will have Huntintgton's Disease?

2007-10-11 15:13:14 · 3 answers · asked by damigurl05 1 in Botany

Evaluate:
6n for n=8
k over 20, for k = 140
50x, for x = 8

2007-10-11 15:12:47 · 24 answers · asked by **Silvia** 3 in Mathematics

sugar and distilled water? wat attracs it to it?
why didnt it like the acid base and salt?

2007-10-11 15:12:33 · 1 answers · asked by I ♥ Colombianos 2 in Biology

Math problems System of linear equation in two variables

2x-5y=3
-4x+10y=3

2007-10-11 15:11:56 · 3 answers · asked by ydfarm 2 in Mathematics

A man and a woman are both heterozygous for Cystic Fibrosis, an autosomal recessive disease. They have 16 pre-embryos screened for the disease. How many will be homozygous dominat, homozygous recessive and heterozygous. How many will be affected, how many will be carriers, and how many will not be affected?

2007-10-11 15:11:49 · 4 answers · asked by damigurl05 1 in Biology

Ok so i have to make a icosahedron (a 20 sided polygon) tonight, and i need the triangles to be 6 inches on each side (equilateral triangles).
i know HOW to make the triangle..once i have the circle. I just don't know how big to make the circle!!
SO my question:
How can I figure out the radius of the circle using only a triangle of 6 inches on each side? or, What would the radius of the circle be?! (THAT would be the mooost helpful answer)

2007-10-11 15:10:03 · 3 answers · asked by Anonymous in Mathematics

Billy inserted a tape into his video cassette recorder, then he hit one then another of the five buttons on the VCR (at random). The five buttons are Rewind, Stop, Play, Pause, FastForward. What is the probability that the Play button was pressed second? Give you answer as a reduced fraction.

2007-10-11 15:09:36 · 4 answers · asked by Anonymous in Mathematics

could someone please help me solve this? im almost there i just dont know the last step.
a person suffering from hyponatremia has a sodium ion concentration in the blood of 0.118 M and a total blood volume of 4.6L. what mass of nacl would need to be added to the blood to bring the sodium ion concentration up to 0.138M assuming no change in blood volume?
so heres what i did:
found the moles Na in the 0.118 solution: 0.543 moles
found the moles in the 0.138 solution- 0.635 moles
found the difference b/w the quantities: 0.092 moles
found that to be 2.12 g. but thats only Na. how do i get NaCl?
please help, i wont go to bed til i get this.

2007-10-11 15:08:57 · 1 answers · asked by Anonymous in Chemistry

given the specific heat of water which is 4.184 j/g*K How can you use this information to find the molar heat capacity?

2007-10-11 15:07:29 · 2 answers · asked by xiong L 1 in Chemistry

Find the equation(s) of all lines which are asymptotes of y = ((3x^2) + 6x + 12)/ x - 2. Give your answer(s) in either the form y = mx + b or x = c, where m,b,c are real.

2007-10-11 15:07:19 · 1 answers · asked by Anonymous in Mathematics

2007-10-11 15:05:37 · 3 answers · asked by superstar 1 in Engineering

Find A + B if ((n^3)+1)/((n^2)+2n = n - 2 + (A/n) + (B/n + 2).

2007-10-11 15:05:01 · 1 answers · asked by Anonymous in Mathematics

2007-10-11 15:04:47 · 5 answers · asked by okieflight 1 in Geography

Three 45g ice cubes at 0 degrees Celsius are dropped into 5.00x10^2 mL of tea to make ice tea. The tea was initially at 20.0 degrees Celsius; when thermal equilibrium was reached, the final temperature was 0 degrees Celsius. How much of the ice melted and how much remained floating in the beverage? Assume the specific heat capacity of tea is the same as that of pure water.

Please show work. Thanks a lot!

2007-10-11 15:04:09 · 1 answers · asked by Anonymous in Chemistry

Let a,b,x,y be positive real numbers such that (a^3)/b,x,y,(b^3)/a, are four consecutive terms of a geometric sequence. Find the ordered pair (x,y). Express your answer using positive rational exponents.

2007-10-11 15:03:24 · 2 answers · asked by Anonymous in Mathematics

Im just wondering about what do scientists study i know they like study everything but i dont know how to put it in words simply.

2007-10-11 15:00:23 · 7 answers · asked by Little X 1 in Other - Science

Something more original than insects (in all their forms) or rats would be good. And why?

2007-10-11 15:00:17 · 10 answers · asked by Anonymous in Biology

ok so i have a lab where after you are done heating the magnism in the crucible and it is done reacting, it says you are suposed to use water to wash out the MgN and then boin the water away to help find the emprical formula of MgO. is adding the water and boiling it away nessary for the lab? or can it be left out and it wont make a difference?

i forgot to add the water in my orignal experiment and for my lab i have to prove that using the water isnt nessary. and toy can still come close to the right answer even though a step was left out.

2007-10-11 14:59:37 · 3 answers · asked by Sara S 2 in Chemistry

Heres the problem:
Ms. Sidher invests a total $18,000 into two accounts bearing simple interest; one account bears 5% and the other bears 8%. If she earns $1,260 interst for the year, how much did she invest in the account thats earns 8%?

I have to use the "tic tac toe" method if you know what that is.

Please show me how you did it to please!

2007-10-11 14:57:24 · 4 answers · asked by Anonymous in Mathematics

2007-10-11 14:56:52 · 1 answers · asked by GC8 1 in Physics

2007-10-11 14:56:52 · 3 answers · asked by Yocool 2 in Chemistry

The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated as KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration, 20.96 mL of the sodium hydroxide solution was required to react with 0.1082 g KHP. Calculate the molarity of the sodium hydroxide.

i got 0.0253M it was wrong

2007-10-11 14:44:17 · 1 answers · asked by My point exactly 5 in Chemistry

Round your answer to the nearest tenth.

2007-10-11 14:41:13 · 3 answers · asked by orange 2 in Mathematics

I'm so lost. Please explain the steps that you did. And, of course, the answer. lol.
Thank you!

2007-10-11 14:40:38 · 4 answers · asked by Chelsey 5 in Chemistry

2007-10-11 14:40:14 · 2 answers · asked by hopeless_case 2 in Botany

How unfortunate, but yes they are going extinct, CCD. Do you think mankind can survive after they're extinct in a few years?

2007-10-11 14:38:49 · 31 answers · asked by Anonymous in Zoology

Please explain the steps, I'm a bit lost on this concept...and of course, the answer.lol

Thank you so much!

2007-10-11 14:37:26 · 5 answers · asked by Chelsey 5 in Chemistry

2007-10-11 14:35:34 · 3 answers · asked by Anonymous in Chemistry