Science & Mathematics - 14 February 2007

2007-02-14 03:23:58 · 4 answers · asked by Anonymous in Mathematics

2007-02-14 03:22:46 · 3 answers · asked by zebbie g 2 in Zoology

State and explain whether you would expect ammonia to be a strong or a weak nucleophile. And would the ammonium ion, NH4+, act as nucleophile, an electrophile or neither, give your reasons. Thanks in advance

2007-02-14 03:22:14 · 3 answers · asked by xaexxx 1 in Chemistry

Asmall radio operates on 5.00 V and has a resistance of 50.0 amps. At what rate does the radio use electric energy? ____ ____

2007-02-14 03:20:39 · 2 answers · asked by Hey ;) 3 in Physics

Cl2, the molecule, can give rise to three attacking species. Write down their formulae and classify each one as a free radical, electrophile or nucleophile. Thanks

2007-02-14 03:20:35 · 1 answers · asked by xaexxx 1 in Chemistry

A 15 kg block slides on a level frictionless surface while attached by a light string to a 5.0 kg hanging mass where the string passes over a massless frictionless pulley. What is the tension in the connenting pulley??

So confused, if you could help/explain I would appreciate it!!

thanks!!

2007-02-14 03:19:56 · 1 answers · asked by Anonymous in Physics

For material testing, is it possible to use ultrasound without using any liquid/gel on the mateirals?

2007-02-14 03:19:41 · 2 answers · asked by Anonymous in Engineering

2007-02-14 03:19:27 · 2 answers · asked by yo yo ma 2 in Mathematics

Usually, a hippo whips a croc.

2007-02-14 03:17:59 · 2 answers · asked by zebbie g 2 in Zoology

A bird accelerating from the rest at a constant rate, experiences a displacement of 28 m in 11 sec. What is the final velocity after 11 s?

I think it's zero, am I right??

please help thanks!

2007-02-14 03:14:18 · 6 answers · asked by Anonymous in Physics

http://www.youtube.com/watch?v=-Dm6f3AMRd8

2007-02-14 03:14:14 · 2 answers · asked by trphuong 1 in Other - Science

I have a T6 PLC manufactured by Trol Systems. In the MCU-04-115 specs, the power requirements are 115VAC, .02A, 50/60 HZ w/1000v magnetic isolation. I understand everything except the w1000v magnetic isolation.

Over forty years playing with Electrical/Electronics I've never heard this term. We've used these for about 5 years and I just now noticed this. They work great and I don't have a problem with them. I'm just curious what they are telling me. Someone help me out.

2007-02-14 03:14:05 · 1 answers · asked by namsaev 6 in Engineering

2007-02-14 03:13:32 · 5 answers · asked by Anonymous in Biology

Theres a very flawed arguement in the arguement of global warming. I think many revolutionaries that are pushing awareness of the issue do not see the major flaw in their arguement.

One of the big problems is the melting of glaciers. These and other ice formations are floating. Or, to better suit this arguement, these structures are displacing water. The amount of water displaced is equal to the weight of the ice.

When the world nears disaster and these ice monsters start melting away, they will not affect the water level at all. As the water sheds off, the ice becomes lighter and displaces less. Sure theres more water in the sea, but it's proportional to the lesser amount of ice in the water. In fact, ice is less dense than water, so the volume of overall water will actually decrease.

I think people dont sit down to think about ideas like this. They just assume melting ice means their waterfront homes are going to go under.

2007-02-14 03:09:25 · 15 answers · asked by Anonymous in Earth Sciences & Geology

2007-02-14 03:09:06 · 30 answers · asked by Honey 2 in Astronomy & Space

Sorry for that irritating title..i mean if i put sumthing like thats when people notice the question!!

Anyways, I need ur help to solve these numbers below:

1. 3^3x - 13 * 3^2x + 13 * 3^ x+1 - 27 = 0

2. Given that the variable x satisfies the equation (3^x) (4^2x+1) = 6^x+2, show that x = log9 / log8

2007-02-14 03:06:31 · 6 answers · asked by Silent 1 in Mathematics

I discovered several brown balls of material on my bedroom wall. When looking at it closer they were little (houses). When I removed them I find a 1/4 inch holes in the sheetrock. I ruled out both ants and termites I have seen the way they burrow. So put on your thinking hats ok!!!!

2007-02-14 03:06:06 · 4 answers · asked by kagetorasamurai 2 in Zoology

i need answers with explanation..i donno how to do union on binary numbers

2007-02-14 03:02:19 · 2 answers · asked by arty 1 in Mathematics

2. What races/heritage are documented as having or not having this RH factor in their blood and has science determined it's function or purpose in the blood?

I know from research that certain blood variants, such as sickle cell affect a disproportionate number of those people's whom have African descent. Is Rh a condition such as this?

Please forgive the language, I know it's incorrect, but I think it's clear what I am asking. Thanks.

2007-02-14 03:01:18 · 2 answers · asked by vicarious_notion 3 in Biology

In the formula E = mc2, what does E represent?

A) the mass-energy, or potential energy stored in an object's mass

B) the gravitational potential energy of an object held above the ground

C) the radiative energy carried by light

D) the kinetic energy of a moving object

E) the electric charge of the object

2007-02-14 02:59:02 · 10 answers · asked by Diggler AKA The Cab Driver 1 in Astronomy & Space

I am doing my Graduation Project on Stream Restoration and I cant find any information on this topic. If you can tell me anything i dont already know i would really appreacate it. Thanks

2007-02-14 02:56:28 · 2 answers · asked by Anonymous in Biology

i'm thinking of buying a meade etx 70 telescope, i'm just starting out on astromony, i dont want to spend too much on a scope and if i get into it i'll upgrade at a later date.

anyone have any thoughts?

i'd like to hear off any owners of one to see what they think?

2007-02-14 02:56:15 · 2 answers · asked by Anonymous in Astronomy & Space

2007-02-14 02:55:45 · 6 answers · asked by jess d 1 in Chemistry

Guy is now one-third of Shay’s age. In 7 years he’ll be one-half of Shay’s age. In 14 years, he’ll be three-fifths of Shay’s age. How old are Guy and Shay now?

2007-02-14 02:54:00 · 9 answers · asked by Minamoto 1 in Mathematics

What is the difference between geoterium and hydrogen. if hydrogen can be produced by splitting 2 paticles of hydrogen from one particle of oxygen (H2O) how could geoterium be produced?
Some people claim that there are geoterium deposits in the southern part of the Philippines and some parts of the United states. If this is true, how can these deposits be acquired for energy provision

2007-02-14 02:53:30 · 3 answers · asked by Arnold C 1 in Earth Sciences & Geology

**I don't know how to show the difference with my keyboard between the sub numbers and the following numbers....so I'm using the sign * if someone has a better suggestion as to what I should use to show sub numbers after 'log' please let me know.

Express a sum of logarithms for
a) log5 *(125*25)

Express a single logarithm for
b) loge *M + loge *T

Express a difference of logarithms
c) loga *(x/y)

Express in terms of logarithms
d) logb *((p^2q^5)/(m^4b^9))

Express as a single logarithm & simplify
e) (1/2)loga *x + 4loga *y - 3loga *x

Okay...getting to the end ;
f) Given logb *3= 0.5283 & logb *5=0.7740 find logb *(5/3)

and the last two I need checked ;
Solve for x;
g) 5^(log5 *8) = 2x

h) loga *a^x = 2.7

Thank you to anyone who even reads this much less helps me check my work by answering!!

2007-02-14 02:51:25 · 4 answers · asked by Je 1 in Mathematics

We know that it's a LOT, because we can see with our eyes and our lovely telescopes that there are, because we have actually counted and catalogued them. My question is, how do you count the ones you cannot see?

You know without a doubt, there's more, but how do you really really know if you can't see them?
What is the thought process that leads to the conclusion that the unseen, unverifiable star is real? Is it The Scientific Method? Please help me understand the manner in which Science comes to it's conclusions.

2007-02-14 02:48:41 · 15 answers · asked by vicarious_notion 3 in Astronomy & Space

1)As a hot air balloon rises to increasingly higher altitudes describe what happens to the volume of the balloon if at constant pressure?

2)What is the volume of 6 moles of helium gas at 0.34 atm pressure and 33„aC?

3)Consider the following changes imposed upon a sample of gas, assuming the variables not mentioned remain constant:
a.What happens to the pressure if the temperature in K is doubled?
b.What happens to the volume if the pressure is tripled?
c.What happens to the volume if the temperature decreases from 300K to 200K?

4)At sea level we are under 15.8 pounds of pressure per square inch of our body. This is the equivalent of a 16 pound bowling ball at every inch of our body. Describe why we are not overcome by the pressure of the atmosphere? What experiment in our course relates to this concept?

i have tried the questions myself but its really hard for me. i really appreciate some help. thanks guys

2007-02-14 02:48:40 · 1 answers · asked by Anonymous in Chemistry

tell me all about you weather .....

2007-02-14 02:48:09 · 13 answers · asked by wether kid 1 in Weather

20.00 mL of 0.0500 M ethylamine C2H5NH2 was diluted with distilled water to 40.00 mL. Calculate the pH of the diluted solution (Kb C2H5NH2= 4.3 * 10^ -4)

2007-02-14 02:44:24 · 1 answers · asked by N 1 in Chemistry