Science & Mathematics - 4 January 2007

glows automatically

2007-01-04 20:17:47 · 10 answers · asked by Aditya S 1 in Engineering

2007-01-04 20:17:29 · 11 answers · asked by Aloneeyes 2 in Astronomy & Space

you win a trip to hawaii if you answer it
...............................

2007-01-04 20:14:26 · 19 answers · asked by Caroline M 2 in Mathematics

A lock gate rectangular section 7.2m wide. The depthof water on the lower side is 2.4m, he depth on the opposite side is is hm. The maximum allowable resultant thrust is 1.5mn. Caculate the least value of h if this thrust is not to be exceeded. This isnt my homework...I'm just revising for exams in feb and knowing the workings out will help me with revision.

2007-01-04 20:13:47 · 1 answers · asked by Anonymous in Mathematics

Or how would you answer creationists when they challenge the theory of evolution?

2007-01-04 20:10:52 · 3 answers · asked by ragdefender 6 in Biology

2007-01-04 20:10:44 · 9 answers · asked by Anonymous in Biology

2007-01-04 20:02:58 · 7 answers · asked by Anonymous in Mathematics

2007-01-04 20:00:01 · 8 answers · asked by kuttooli 1 in Astronomy & Space

2007-01-04 19:59:48 · 4 answers · asked by ndikuwen 1 in Biology

yeah its a math corretctions help :D but can you also explain to me how to do it thanks :)

2007-01-04 19:53:18 · 14 answers · asked by Caroline M 2 in Mathematics

2007-01-04 19:48:13 · 7 answers · asked by vagicharla m 1 in Botany

A plank is used to reach over a fence 8 ft high to support a wall that is 1 ft behind the fence. What is the length of the shortest plank that can be used? The plank is the hypotenuse of a triangle formed by the wall and the ground.

How do I even begin approaching this? The hint is that I'm supposed to express the length of the plank in terms of the angle opposite the wall.

2007-01-04 19:45:26 · 3 answers · asked by prescitedentity 2 in Mathematics

2007-01-04 19:44:51 · 4 answers · asked by Anonymous in Chemistry

2007-01-04 19:41:30 · 11 answers · asked by Anonymous in Astronomy & Space

Do we take an average of low and high tides or do we follow any other international convention ?

2007-01-04 19:40:25 · 1 answers · asked by Anonymous in Geography

2007-01-04 19:40:02 · 12 answers · asked by Anonymous in Biology

When you put a AC voltage around a DC battery? Think about it for a bit....

2007-01-04 19:39:26 · 5 answers · asked by magpiesmn 6 in Astronomy & Space

2007-01-04 19:38:54 · 2 answers · asked by Anonymous in Biology

2007-01-04 19:35:50 · 2 answers · asked by Gypsophila 3 in Mathematics

2007-01-04 19:35:27 · 8 answers · asked by hooya 3 in Weather

Because isnt that basicaly what we have done to the earth with power generation? Also I would like to know what happens when you run the same with a much much larger DC battery fairly close to the same system. Cause that would be kinda like the earth and sun relationship...

2007-01-04 19:21:37 · 2 answers · asked by magpiesmn 6 in Physics

2007-01-04 19:21:11 · 7 answers · asked by taiiwan 2 in Other - Science

Your aunt calls to ask for your help in making a decision about buying a new refrigerator.
She says that she found two that seem to fit her needs, and both are supposed
to last at least 14 years, according to Consumer Reports. The initial cost for
one refrigerator is $712, but it only uses 88 kilowatt-hours (kWh) per month. The
other refrigerator costs $519 and uses an estimated 100 kWh/per month. You do
not know the price of electricity per kilowatt-hour where your aunt lives, so you
will have to decide what in cents per kilowatt-hour will make the first refrigerator
cheaper to run during its 14 years of expected usefulness. Write your aunt a letter
explaining what you did to calculate this cost, and tell her to make her decision
based on how the kilowatt-hour rate she has to pay in her area compares with your
estimation.

2007-01-04 19:12:00 · 9 answers · asked by Rene 5 in Mathematics

out of 5-7 digits numbers, what is the shortcut way to fine whether they are the divisibles of 3,4,5,7,11. i.e., that numbers should get remainder 0 if it is divided by the above said numbers(3,4,5,7,9,11)

2007-01-04 19:09:27 · 5 answers · asked by vinu 1 in Mathematics

2007-01-04 19:05:17 · 6 answers · asked by swam 1 in Geography

thanks! here they are:

i. what is the purpose in doing the blank sample? why not go directly to the standard solutions?

ii. What is the purpose of pressing the "Autozero" button?

iii. why do you have to specify the wavelength in the determination of absorbance?

iv. what is the difference in using different types of light sources?

v. what is the difference in using different types of cuvettes?

2007-01-04 19:04:22 · 2 answers · asked by zenobia 1 in Chemistry

The only variable was the payload I placed on the rockets. Both water rockets had the same psi, same water level, etc.
Why does the rocket with a greater payload hit the ground earlier than the one wit ha lighter payload? Doesn't everything fall at the same speed/acceleration?

2007-01-04 19:03:07 · 3 answers · asked by The Riddler 3 in Physics

2007-01-04 18:55:47 · 5 answers · asked by have_somefun01 2 in Mathematics

2007-01-04 18:55:02 · 6 answers · asked by Anonymous in Mathematics

2007-01-04 18:54:38 · 2 answers · asked by Anonymous in Zoology