Science & Mathematics - 7 November 2007

What are the effects of air pressure and air temperature on weather?

2007-11-07 12:05:28 · 7 answers · asked by Anonymous in Weather

2007-11-07 12:04:53 · 4 answers · asked by Bryan K 1 in Astronomy & Space

How do you prove:

inverse sin x + inverse cos x = pie/2 ?

(inverse sinx = arcsin x) ( inverse cosx = arccosx)

2007-11-07 12:02:04 · 1 answers · asked by anan21uk 1 in Mathematics

attached to the object. If the rope makes an angle θ with a plane, then the magnitude of the force is given below, where μ is a constant called the coefficient of friction.

F = (μ * W) / (μ * sin( μ ) + cos( μ ))

1) For what value of θ is F the smallest?

2) What is the smallest value of F?

2007-11-07 12:00:26 · 1 answers · asked by thezach322 1 in Mathematics

2007-11-07 11:59:50 · 5 answers · asked by Flavia K 1 in Weather

The string in a yo-yo is wound around an axle of radius 0.545 cm. The yo-yo has both rotational and translational motion, like a rolling object, and has mass 0.274 kg and outer radius 1.96 cm. Starting from rest, it rotates and falls a distance of 1.50 m (the length of the string). Assume for simplicity that the yo-yo is a uniform circular disk and that the string is thin compared to the radius of the axle.

(a) What is the speed of the yo-yo when it reaches the distance of 1.50 m?
_______m/s
(b) How long does it take to fall? [Hint: The translational and rotational kinetic energies are related, but the yo-yo is not rolling on its outer radius.]
______s

2007-11-07 11:55:50 · 1 answers · asked by Anonymous in Physics

Imagine a parallel circuit with 3 lamps in each branch. Connected to the circuit is an ammeter and a constant-voltage d.c. supply. Each bulb operates at normal brightness and the ammeter (of negligible resistance) registers a steady current.

Then, the filament of one of the bulbs breaks. What happens to the ammeter reading and to the brightness of the remaining bulbs?

The answer is that the ammeter reading decreases and the bulb brightness remains unchanged.

I don't understand why the ammeter reading decreases and why the bulbs' brightness remain the same. I thought the bulbs' brightness will be increased cos one of the filament of the bulb breaks so more current will flow through the other 2 bulbs, isn't it? With more current, shouldn't the other two bulbs shine more brightly? Please answer my 2 questions stated above, thanks.

2007-11-07 11:48:33 · 8 answers · asked by ♪£yricảl♪ 4 in Physics

Please help me with this problem. I have no idea how to do it!
1+2^2+3^2+4^2+......= (n+1)^2

It is really complex. I am trying to find the answer! Please help!

2007-11-07 11:47:09 · 5 answers · asked by Hello! 3 in Mathematics

2007-11-07 11:45:57 · 4 answers · asked by cara v 1 in Chemistry

2007-11-07 11:45:36 · 2 answers · asked by Rachh B 1 in Mathematics

2007-11-07 11:45:14 · 9 answers · asked by Norrie B 2 in Astronomy & Space

Through the bone structure and everything scientists/archaelogists have found and preserved, i read/heard that dinosaurs can be brought back by the government,but are not doiing so because they fear the dinosaur could go on a killing spree? With all the technology we have,stemcell research and all,scientists creating animals through ismple egg cells and even body cells,hard to believe we cant revive prehistoric creatures,including mammoths,dinosaurs,sabre toothed tigers,and others.

2007-11-07 11:44:45 · 2 answers · asked by Anonymous in Biology

He is a terrible teacher and wastes about 3/4 of the class time just finding out the answers to his own practice problems

it literally takes us 35 minutes to go over like 2 simple problems

2007-11-07 11:43:42 · 1 answers · asked by big mike 2 in Physics

I need help finding the formulas and other symbols for these substances.
1. metallic potassium
2. sodium chloride dissolved in water
3. heat supplied to a chemical reaction
4. liquid mercury
5. zinc chloride as a catalyst
6. carbon dioxide gas

2007-11-07 11:43:39 · 1 answers · asked by (: Muffin Man :) 2 in Chemistry

An aircraft carrier launches an airplane with mass 1.12 x 10^4 kg by taking it from rest to 79 m/s over a distance of 159 m. The net unbalanced force required to produce this acceleration is_ N.

(Check the number of significant figures.)

2007-11-07 11:43:38 · 1 answers · asked by Anonymous in Physics

2007-11-07 11:43:34 · 1 answers · asked by Anonymous in Chemistry

If 5g of butter are burned in a calorimeter containing 1 L of water (density of water is 1g/mol), the temperature of the water rises from 21°C to 66°C. determine the amount of energy that is transferred to the water.

Q = mCT
=(1005g)(4.184J/g•°C)(66°C - 21°C)
=189221.4J

I think I'm wrong though... Will you help please?

2007-11-07 11:43:07 · 1 answers · asked by Anonymous in Chemistry

I know there is like a cirrus and a stratus but what are all the cloud types and their forms. pleez and thank you! \(*_*)/

2007-11-07 11:42:23 · 5 answers · asked by @(*0*)@ 2 in Weather

2007-11-07 11:41:12 · 5 answers · asked by stephanie m 1 in Mathematics

Squareroot 7 over 5th root 7

2007-11-07 11:40:29 · 1 answers · asked by Anonymous in Mathematics

yeah this is mad hard.
so if anyone has an image could they put the url up in their browser?

:] thanks bunches

2007-11-07 11:40:20 · 1 answers · asked by Anonymous in Chemistry

KW= gallons per hour x delta T/ 410

How would you determine Kw by, the number of gallons of OIL you BURN?

10 gallons of OIL per hour,what's the KW?

2007-11-07 11:40:13 · 1 answers · asked by Irvine T 1 in Engineering

ap biology

2007-11-07 11:40:12 · 1 answers · asked by Anonymous in Biology

Say they are looking for E.T. life out there in the Universe which I am 100% sure they are doing right now. Tell me that they can NEVER EVER say that E.T. life does not exist?

Because they HAVE to look till they have found life or till they have run out of resources for finding it. But they can never say that E.T. life does not exist. What's the difference between E.T. life and God? They can't prove either one yet they say (I'm sorry to the scientists who believe in God) that God does NOT exist because no one can scientifically prove it and at the same time they are not eliminating the possibility that E.T. life exists. ...just wondering.

Or am I wrong in stating that scientists have disregarded God?

And I'm sorry for posting this in your forum but I want answers from scientists and not from religious people.

2007-11-07 11:39:56 · 15 answers · asked by ? 2 in Astronomy & Space

2007-11-07 11:37:47 · 6 answers · asked by starlight 1 in Weather

Confirmation that there is in situ carbon-14 in diamonds has now been reported in the conventional literature.3 R.E. Taylor of the Department of Anthropology at the University of California–Riverside and of the Cotsen Institute of Archaeology at the University of California–Los Angeles teamed with J. Southon at the Keck Accelerator Mass Spectrometry Laboratory of the Department of Earth System Science at the University of California–Irvine to analyze nine natural diamonds from Brazil. All nine diamonds are conventionally regarded as being at least of early Paleozoic age, that is, at least several hundred million years old. So, if they really are that old they should not have any intrinsic carbon-14 in them. Eight of the diamonds yielded radiocarbon “ages” of 64,900 years to 80,000 years. The ninth diamond was cut into six equal fragments, which were each analyzed. They yield essentially identical radiocarbon “ages” ranging from 69,400 years to 70,600 years. This suggests the carbon-14

2007-11-07 11:36:11 · 1 answers · asked by Anonymous in Earth Sciences & Geology

What happens when electrons in atoms are heated or energized by electricity?
When do atoms release energy?
In what form is that energy released from the atom? Is that form always visible?

whoever can answer the most wins

yeah I know I'm asking you to do my homework but I really don't care

2007-11-07 11:31:44 · 1 answers · asked by Lucy 2 in Chemistry

2007-11-07 11:30:22 · 3 answers · asked by tootybug31 1 in Geography

if you could direct me with how to figure out the sine or cosine i'll be on my way to solving for the other trig functions. thanks in advance!

here's the problem.

find sin x and cos x given cos(x/2)= -1/4 and is in quadrant 2

2007-11-07 11:29:11 · 1 answers · asked by Anonymous in Mathematics

2007-11-07 11:28:33 · 1 answers · asked by f_k_l_5031 1 in Mathematics