Science & Mathematics - 4 December 2007

Simplify: (2a-5)(a^2-3a-9)
Simplify: 2x^2-x[3-2(x+3)] I think the second one is multiplication of a polynomial but I'm not sure

2007-12-04 13:30:39 · 2 answers · asked by tianna_85902 1 in Mathematics

2007-12-04 13:29:24 · 9 answers · asked by Zac M 1 in Biology

an exotic finish to massive stars is that a neutron star, which might have as much as five times the mass of our Sun packed into a sphere about 10 km in radius! Estimate the surface gravity on this monster.

answer: 6.7 x 10^12 m/s^2

is this one similar as the above in terms of solving it?

2. A typical white dwarf star, which once was an average star like our Sun but is now in the last stage of its evolution, is the size of our Moon but has the mass of our Sun. What is the surface gravity on this star?

answer 4.4 x 10^7 m/s^2

2007-12-04 13:28:19 · 1 answers · asked by Anonymous in Physics

???

2007-12-04 13:27:46 · 2 answers · asked by mizz kay 3 in Mathematics

david blaine and criss angel did it.
but how about that man who did the same thing infront of the white house last month?

2007-12-04 13:27:43 · 8 answers · asked by le sabre 4 in Other - Alternative

about how many amps does a large shopping mall use?

2007-12-04 13:27:26 · 2 answers · asked by Alex 3 in Engineering

Ok so I've been confused.....everybody talks about how stupid it is having a HIGH IQ.....yet some ppl say its the greatest thing! and what is considered a HIGH IQ? What would count as high or is that low or average? what is a 135?

2007-12-04 13:25:39 · 9 answers · asked by Anonymous in Other - Science

my problem looks like this, i tried my best to recreate how it looks so bear with me

..[4 ......y] .. [12 ...-15]
x|.......... .|..=|..............|
..[7 .....2.] ...[21 .......z]

anyway, i know how to do regular ones, but the outside variable (x) is making it more difficult for me to understand...can anyone explain how to do this?

answers to the problem are:

x= 3
y= -5
z= 6

2007-12-04 13:25:35 · 2 answers · asked by Joe 2 in Mathematics

mime are Puggy, D.L Santa, Dr. D, Puzzling, and Pi r square.

I really admire those people above, and of course i also admire others. They've been helping people for more than 1 year now, i believe. I'm sure many people are better at math thanks to their helps.

2007-12-04 13:25:30 · 5 answers · asked by Anonymous in Mathematics

How many different ways can you make up 1000, using exactly eight eights and no other numbers and the usual mathematical operations of arithmetic.

i found two of them.
but need more.
i got these two
888+88+8+8+8=1000
and i really can't remember the other one.
i need to find least one more.

2007-12-04 13:21:50 · 8 answers · asked by vhs1cougar 1 in Mathematics

What server or machine is the central holding point of the internet? Where is it located, City?

2007-12-04 13:21:16 · 15 answers · asked by Christopher S 2 in Other - Science

2007-12-04 13:20:54 · 2 answers · asked by Everyone 4 in Physics

I'm sort of confused with this question. You don't necessarily have to answer it, but can you help me on it mostly? What it pretty much is, genetics. A male and female have two children where they both have a disease that neither of the parents have. what's the probability that the third child will have this disease as well?

That's pretty much all I remember from the question, thank you!, lol.

2007-12-04 13:18:34 · 2 answers · asked by Addie M. 1 in Biology

Which city is located farthest South?What state is it in?


what cities are located in the northeast?how would you charactertize the population density in the that subregion?



where are the cascade and the sierra nevada ranges found in relation to the rocky mountains?


which states share a border with mexico?



which midwest cities are located near waterways?

2007-12-04 13:15:21 · 2 answers · asked by Anonymous in Geography

ice water remain at 0 deg C? ( the answer is not .148 grams)

2007-12-04 13:15:20 · 1 answers · asked by Anonymous in Physics

2007-12-04 13:15:05 · 3 answers · asked by ♥Roberta. 5 in Biology

2007-12-04 13:13:17 · 1 answers · asked by Anonymous in Mathematics

2007-12-04 13:13:14 · 2 answers · asked by Riley 6 in Mathematics

I have a test on Friday and I need to get this question clearly awnsered. What is the difference between force and energy. My teacher said Energy- Ability to do work ; Force- Push or pull on an object. What is the difference. And also I'd appreciate a better explanation of Energy.

2007-12-04 13:11:58 · 2 answers · asked by Mustafa H 1 in Physics

1. A certain dam is holding back fresh water 209 m deep. What is the water pressure at the base of the dam?

2.}
A 0.90 kg mass attached to a vertical spring of force constant 139 N/m oscillates with a maximum speed of 0.33 m/s. Find the following quantities related to the motion of the mass.
(a) the period
(b) the amplitude
(c) the maximum magnitude of the acceleration


3.}A bunch of grapes is placed in a spring scale at a supermarket. The grapes oscillate up and down with a period of 0.37 s, and the spring in the scale has a force constant of 670 N/m.

(a) What is the mass of the grapes?
(b) What is the weight of the grapes?

2007-12-04 13:11:22 · 1 answers · asked by Anonymous in Physics

2007-12-04 13:11:19 · 4 answers · asked by Anonymous in Engineering

You are in charge of 65 youths. An extra staff member will be required if this population increases by 20%. What is the number of youths that would require an extra staff member?

What formula do u use to get the answer?

2007-12-04 13:11:12 · 3 answers · asked by Anonymous in Mathematics

1} A person in a rocking chair completes 23 cycles in 38 s. What is the period and frequency of the rocking?

2} The position of a mass oscillating on a spring is given by x = (3.9 cm) cos [2t / (4.40 s)].

(a) What is the period of this motion?
(b) What is the first time the mass is at the position x = 0?

3.)A typical tidal wave (tsunami) can have a speed of 739 km/h and a wavelength of 305 km. What is the frequency of such a wave?

4.)In a pig-calling contest, a caller produces a sound with an intensity level of 110 dB. How many such callers would be required to reach the pain level of 120 dB?
Two musicians are comparing their clarinets. The first clarinet produces a tone that is known to be 509 Hz. When the two clarinets play together they produce 8 beats every 2.00 seconds. If the second clarinet produces a higher pitched tone than the first clarinet, what is the second clarinet's frequency? (Express your answer to the nearest hertz.)

6.)A 89 kg person sits on a 3.5 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.7 cm in diameter. Find the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed
5.)

2007-12-04 13:08:40 · 2 answers · asked by Anonymous in Physics

2007-12-04 13:07:27 · 8 answers · asked by MARK S 1 in Astronomy & Space

how do i set and solve this problem

thanks in advance for any help

Earth rotates on an axis through its poles. The distance from the axis to a location on earth 40 degree N latitude is about 3033.5 miles. therefore a location on on Earth at 40 degrees N latitude is spinning on a radius 3033.5miles . compute the lnear speed on the surface on the earth at 40 degrees latitude.

2007-12-04 13:05:55 · 1 answers · asked by Krazyk78 1 in Mathematics

2007-12-04 12:57:10 · 5 answers · asked by Anonymous in Earth Sciences & Geology

I need this for a science project

2007-12-04 12:56:00 · 4 answers · asked by warman21 1 in Biology

2007-12-04 12:55:18 · 4 answers · asked by Anonymous in Earth Sciences & Geology

Cis-Platin is a chemotherapy drug that has the formula PtCl2(NH3)2. If you have 402.00 grams of cis-platin, how many grams of nitrogen would it contain? Enter your answer in scientific notation. For example 3.14E-6.

i don't understand how to go around doing that either
help please

2007-12-04 12:55:01 · 4 answers · asked by DDTHAPPINESS 5 in Chemistry

a bank contains 100 coins, each is either a nickel, a dime, or a quarter. there are twice as many quarters as nickels. the value of the collection is $13.75. how many quarters are in the collection?

how do you solve this? thanks

2007-12-04 12:52:28 · 5 answers · asked by Anonymous in Mathematics