Science & Mathematics - 16 September 2007

I need the nth term for the sequence 4,9,16,25,36. I know the second difference is 2 and it involves an n squared....
Help please asap!

2007-09-16 08:07:19 · 1 answers · asked by Anonymous in Mathematics

Please explain your answer

2007-09-16 08:06:00 · 4 answers · asked by shiny 1 in Chemistry

2007-09-16 08:05:57 · 8 answers · asked by eynard b 1 in Astronomy & Space

find the exact value of :

sin (-210)

sec(315)

please help, thanks

2007-09-16 08:05:07 · 4 answers · asked by rickyricardoiscool 1 in Mathematics

A mass m is attached on a horizontal spring and is immobile.The k of the spring is 2000 N/m.We move the mass away from the equillibrium point to an amplitude A'=0.16 cm and then we set it free to move.It does a damped oscillation, with an amplitude which is getting smaller 25% in evey oscillation.

Find how much will the total energy be decreased after the two first oscillations of the mass.

2007-09-16 08:04:45 · 1 answers · asked by Joey 1 in Physics

How much magnification (optical zoom) would a digital camera need for Venus to take up a full frame(picture)? I'm talking about taking the picture from Earth obviously.

2007-09-16 08:02:28 · 3 answers · asked by Anonymous in Astronomy & Space

can u help answer it.

2007-09-16 07:59:27 · 5 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-16 07:59:21 · 3 answers · asked by Patricia K 1 in Engineering

Question is:

Two rectangles that are the same except in size.

Rectangle 1(larger of the two):
a)has an area: 64cm^2
b)a long side of 8.2cm

Rectangle 2(smaller of the two)
a)has an area of 25cm^2

b) the long side is unknown, how do we find this out.

I thought you needed to do.

Large area - small area
64 - 25 = 39

The square root of this to change the scale factor to length not area which = 6.2

then do 25(area of smaller) divided by 6.2 = 4? is this correct>

thanks for any help

2007-09-16 07:59:16 · 7 answers · asked by AndyCFCO 1 in Mathematics

2007-09-16 07:51:16 · 7 answers · asked by Anonymous in Earth Sciences & Geology

what is the average amount
I'm doing homework and it soesn't say it anywhere else

2007-09-16 07:48:11 · 1 answers · asked by Anonymous in Earth Sciences & Geology

can u plese tell me how u did the work plz?

thank you!!!

2007-09-16 07:46:56 · 4 answers · asked by Anonymous in Mathematics

I found some info. but i need more for my science class...if you could help that would be great!!!

2007-09-16 07:41:23 · 4 answers · asked by Hannah 1 in Mathematics

How many days would it take you to count a million pennies if you could count one penny each second?

2007-09-16 07:34:14 · 5 answers · asked by Anonymous in Mathematics

2007-09-16 07:33:23 · 3 answers · asked by matt_sorrentino 1 in Engineering

Does the frame design affect the hurling distance or the efficiency of the trebuchet? Because I have a design but I don't like the way the frame will be built, it doesn't have that authentic, "medieval" look to it. So I want to modify it. But will this make the hurling distance shorter or longer? Or is the frame design irrelevant?

2007-09-16 07:33:23 · 4 answers · asked by Anonymous in Engineering

2007-09-16 07:31:49 · 4 answers · asked by Vbabecutie 17 1 in Geography

2007-09-16 07:31:39 · 3 answers · asked by daisy f 1 in Other - Science

Thanks to a Yahoo Physcis expert they gave me the following:

´h=-16*t^2 +70 feet
v=-32 *t feet/s
h=0 t^2 = 70/16 so t =sqrt(70/16)=2.09 s

Can I get the answer too for each calculation? Just want to double check what I am doing is right

2007-09-16 07:31:22 · 2 answers · asked by Cutekow 2 in Physics

Please how do you do this?
at least how to solve the equation disregard the solution
Solve the equation then ,check your solution.

3n-4=17



m+14=8-2m



5x+17=2x-10

2007-09-16 07:31:03 · 5 answers · asked by Jessie 1 in Mathematics

2007-09-16 07:29:57 · 2 answers · asked by x1gemma1x 1 in Mathematics

hot end-70 degrees celsius
cold end-28 degree celsius

2007-09-16 07:29:41 · 1 answers · asked by thetnees 1 in Engineering

i need to know that because i have to make a cube type thing to hold 376 pieces of popcorn for science


thank you!!!

2007-09-16 07:28:55 · 3 answers · asked by Unmistakable Ballerina 2 in Mathematics

I often hear people refer to scientists in very general statements such as "Scientist believe..." or "Scientists dicovered that...". I would like to know if there is a national science board or something similar, where I can read about new discoveries and advances without getting conflicting stories. I often hear of something that "scientists" discovered and all of the sudden these creationists start poping up to refute the claim. Pretty soon it becomes impossible to find the original discovery.

My main interests are in the forming of the universe, fossil evolution, and DNA advances. If anyone knows of any good scientific accredited sites where I wont hear "god did it" mumbo jumbo I would love to hear about them, thanks!

2007-09-16 07:24:12 · 6 answers · asked by Apollo's Revenge 3 in Other - Science

Problem Solving:
SHOW WORK

#1.) For an art project, you make a square print with a side length of 8 inches. You make a frame using strips of wood
1 1/4 inches wide. What is the area of the frame?

2007-09-16 07:22:23 · 4 answers · asked by merrbby14 1 in Mathematics

Say you were flying in an airplane going about 600 miles per hour and you shot a flash light out the window, would 600 miles per hour add to lights speed?

2007-09-16 07:21:22 · 9 answers · asked by Sccerguy94 1 in Engineering

Can you please explain?

2007-09-16 07:20:57 · 1 answers · asked by Anonymous in Mathematics

If an infrequent user is 40% more likely to develop psychosis than a non user, does this mean that 40% of all persons diagnosed as psychotic has a history of infrequent use? It also said that frequent users are 200% more likely to develop psychosis. Does this mean 200% of all persons diagnosed to be psychotic were frequent users? That doesn't make sense, and I'm not really good with math, can you explain what these percentages mean, and how they got those numbers? Thanks!

2007-09-16 07:18:33 · 3 answers · asked by word 7 in Mathematics

Which instruments or techniques do they use, to move from one point to another?

Be as precise as you can.

(I need this information for this particular reasons).

2007-09-16 07:17:41 · 5 answers · asked by Anonymous in Engineering

need help with answer please and steps

2007-09-16 07:14:56 · 4 answers · asked by ..l* 2 in Mathematics