Science & Mathematics - 5 February 2007

Large trees? conduction
turbines? convection
windows? convection
white paint? radiation
drapes-convection
tint?-radiation
boxing (house)- radiation

2007-02-05 12:56:53 · 2 answers · asked by ghettoco 1 in Physics

i don't get these, can someone explain how to do them? thankss


1. the second of the two numbers is 4 times the first. their sum is 50. find the numbers.

2.the second of the two numbers is 45. the first is 9 less than the second. find the numbers.

2007-02-05 12:56:31 · 11 answers · asked by Anonymous in Mathematics

A cylindrical gas tank with radius 4ft and length 25ft is buried on ids side at a gas station. If the gas is 6ft deep in the tank, what is the volumn in cubic ft.

2007-02-05 12:56:00 · 2 answers · asked by cevfuture 1 in Mathematics

2007-02-05 12:55:49 · 4 answers · asked by grumpycandy_0 1 in Botany

What is the best site to find information on Beluga Whales?

2007-02-05 12:54:31 · 2 answers · asked by JustWondrering 2 in Zoology

2007-02-05 12:54:09 · 2 answers · asked by dragonfly32112p 1 in Chemistry

2007-02-05 12:53:38 · 3 answers · asked by rizwanjattala385 1 in Biology

what about physics, is it physical or biological science?

2007-02-05 12:53:23 · 4 answers · asked by Anonymous in Earth Sciences & Geology

What is the most common extracellular ion?

2007-02-05 12:52:44 · 2 answers · asked by skoolgirl 1 in Biology

x+2/x+3 + 1/x²+2x-3-1+0
show your work

2007-02-05 12:52:44 · 4 answers · asked by sexyjay1962 1 in Mathematics

2007-02-05 12:52:17 · 3 answers · asked by cardpopper 2 in Earth Sciences & Geology

homework help

2007-02-05 12:52:12 · 6 answers · asked by Anonymous in Earth Sciences & Geology

How many moles of sulfate ions, cobalt(III) ions, and oxygen atoms are present in 0.408 mol of cobalt(III) sulfate?
Please Explain!

2007-02-05 12:51:55 · 1 answers · asked by just_curious 1 in Chemistry

2007-02-05 12:51:01 · 1 answers · asked by Smiley 2 in Earth Sciences & Geology

2007-02-05 12:49:49 · 8 answers · asked by thecaptain114 1 in Astronomy & Space

2007-02-05 12:49:48 · 2 answers · asked by Anonymous in Botany

Assume the half-life of the substance is 34 days and the initial amount is 116 grams.

Whats the formula in terms of t? A=?
How long would it talk to decay to 2.3 grams.

Thanks

2007-02-05 12:49:06 · 3 answers · asked by J R 2 in Mathematics

2007-02-05 12:48:50 · 2 answers · asked by Tori T 1 in Biology

If enough fire was applied to a hurricane, could it stop the hurricane? There would be no limit to how big the fire would be, so don't say that the fire wouldn't be big enough or the gas or whatever would run out. Could fire stop a tornado?

What if a hurricane/tornado was to be hit by a freezing force?(this is unrealistic, but what would happen?) The freezing force would be fast, powerful, big, and also has not limit on power.

2007-02-05 12:48:26 · 4 answers · asked by Anonymous in Weather

(2 square root of 2) -2 all divided by 2

I keep thinking all the two's outside of the square root sign cancel out but I'm not sure

2007-02-05 12:48:17 · 4 answers · asked by Nicky 2 in Mathematics

I think Sum is addition but what is the terms or words for Subtract, Minus, Division?

2007-02-05 12:48:06 · 7 answers · asked by Anonymous in Mathematics

Solve each pair of equations:

1) 5x + 2y = 11 and x + y = 4

2) 2p + 5q = 15 and 6p + 15q = -29

3) 3a + b = 4 and 6a + 2b = 8

Show Work Please. Thank You

2007-02-05 12:47:36 · 1 answers · asked by Anonymous in Mathematics

a. inertia
b. weight
c. speed
d. gravity

2007-02-05 12:47:22 · 3 answers · asked by J 6 in Physics

A fishing boat traveled 3 hours with a tail wind of 40km/hr. The return flight against the same wind took 8 hours. Find the speed of the airplane in still air.

2007-02-05 12:46:58 · 9 answers · asked by Magda A 1 in Mathematics

plz help

2007-02-05 12:46:50 · 3 answers · asked by Riccardo 2 in Chemistry

The integral from 0 to 1 of squareroot(2+4y^2) dy. Can anyone help me solve this problem please.

Thank you!!!

2007-02-05 12:46:29 · 2 answers · asked by Johnny O 1 in Mathematics

NO INNAPROPRIATE ANSWERS PLEASE!
Thanks!
-Jessica

2007-02-05 12:45:08 · 2 answers · asked by O 3 in Botany

2007-02-05 12:43:54 · 4 answers · asked by Leslie P 1 in Zoology

Fuel consumption of a new car was measured when it was test driven at various speeds in top gear. For a speed of 'v' kilometres per hour, the fuel consumption, f(v) kilometers per litre, was found to be roughly modelled, for 50
f(v) = -0.0019v^2 + 0.3686v + 8

a) Find f(v) and df/dv when v = 70 and 100.

b) What do the results in (a) indicate about fuel economy?

c) What is the most economical speed for this car?

2007-02-05 12:43:48 · 1 answers · asked by m577a1 1 in Mathematics

my mother just asked me did i actually believe that! i'm 17 and all my life i thought that wen the groundhog see his shadow, its 6 more weeks of winter. she says its gonna be 6 more weeks of winter regardless. who's right?

2007-02-05 12:42:28 · 6 answers · asked by Anonymous in Zoology