Science & Mathematics - 24 July 2007

A) sulfur
B) selenium
C) sodium
D) carbon
E) nitrogen

2007-07-24 21:21:11 · 3 answers · asked by ~daweed~ 3 in Chemistry

a brick slides down an inclined plank at a constant speed when the plank is inclined at an angle theta_0. if the angle is increased to theta_1, the block accelerates down the plank with acceleration a. the coefficient of the kinetic friction is the same in both cases.
given the two theta, calculate a.

2007-07-24 21:19:47 · 1 answers · asked by la 1 in Engineering

The valence shell of the element X contains 2 electrons in a 5s subshell. Below that shell, element X has partially filled 4d subshell. What type of element is X?

A) representative
B) transition metal
C) halogen
D) alkali metal
E) alkaline earth metal

2007-07-24 21:17:13 · 1 answers · asked by ~daweed~ 3 in Chemistry

modern physics state that moving an object at (or more) the speed of light require infinite energy. This also means that if object 1 is traveling more than the speed of light compared to object 2, then object 2 can get infinite energy from object 1. But making 2 objects having a relative speed of more than the speed of light is possible like this:

Fire object1 from earth to moon with 60% speed of light. Fire object2 from moon to earth with 60% speed of light. Now compared to object 1, object2 is traveling 120% speed of light. So from object 1's point of view object 2 has infinite amount of energy. How it is? Why the contradiction?

2007-07-24 21:14:32 · 4 answers · asked by Thomas Jude 2 in Physics

6,500,000 broken dwn as follows
Diffrence
(Formular required)
0.00 320,000.00 = 320,000

320,000.00 1,141,520.00 = 821,520

1,141,520.00 5,705,520.00 = 4,564,000

5,705,520.00 6,500,000.00 = 794,480
(End with Same Amount as in the Beginning 6,500,000)

2007-07-24 21:03:33 · 2 answers · asked by Anonymous in Mathematics

In terms of the flow-scheme for the identification of unknowns, which of the following test sequences would be appropriate for 2-butanol?

1) Chromic acid - Iodoform
2) 2,4-Dinitrophenylhydrazine - Chromic acid - Iodoform
3) 2,4-Dinitrophenylhydrazine - Lucas - Chromic acid
4) 2,4-Dinitrophenylhydrazine - Beilstein - Bromine - Chromic acid - Lucas

anyone has idea?thank you

2007-07-24 20:57:59 · 1 answers · asked by ichigokun 1 in Chemistry

In terms of the flow-scheme for the identification of unknowns, which of the following test sequences would be appropriate for 3-pentanone?

1) Chromic acid - Iodoform
2) 2,4-Dinitrophenylhydrazine - Tollens - Iodoform
3) 2,4-Dinitrophenylhydrazine - Chromic acid - Iodoform
4) Iodoform

anyone has any idea?thank you

2007-07-24 20:57:01 · 1 answers · asked by ichigokun 1 in Chemistry

These are geometry stuffs.

2007-07-24 20:47:30 · 5 answers · asked by ½ÃÂù ± 2 in Mathematics

Help me in 8 hrs..

2007-07-24 20:46:14 · 2 answers · asked by ½ÃÂù ± 2 in Mathematics

We are trying to make the robot have more speed than torque as far as the wheels go. The total bot weight will be 12 lbs. The actual spinning weapon/armor will not exceed 8lbs. Would it be better if we have more speed than torque, to destroy the other robots? How much RPM do we need on the motor which will run on 12 V?

2007-07-24 20:45:58 · 1 answers · asked by Anonymous in Engineering

messuring in india Telugu. I purchased Land 600 gajalu in huderabad, india, how do we messure or convert in feets?

2007-07-24 20:45:53 · 3 answers · asked by Ven 1 in Mathematics

will taking an overdose of anti-depressant medication kill?

(i'm writing a story and this is a plot line)

2007-07-24 20:37:06 · 3 answers · asked by la_lluvia_06 2 in Medicine

can we just all use 100 volts? that will help conserve electricity, right?

also, why just we all use DC instead of AC? this way, no one gets electricuted, no?

2007-07-24 20:29:38 · 3 answers · asked by jor-jor 5 in Engineering

a brick slides down an inclined plank at a constant speed when the plank is inclined at an angle theta_0. if the angle is increased to theta_1, the block accelerates down the plank with acceleration a. the coefficient of the kinetic friction is the same in both cases.
given the two theta, calculate a.

2007-07-24 20:25:57 · 3 answers · asked by Anonymous in Physics

2007-07-24 20:21:47 · 1 answers · asked by Simona Sekulova 1 in Chemistry

2007-07-24 20:20:27 · 1 answers · asked by Simona Sekulova 1 in Chemistry

a typical automobile has a maximum deceleration of about 7m/s^2, the typical reaction time to engage the brakes is 0.5s. a school board sets the speed limit in the school zone to meet the condition that all cars should be able to stop at a distance of 4 m.

a. what maximum speed should be allowed for a typical automobile?

b. what fraction of the 4 m is due to the reaction time?

2007-07-24 20:13:54 · 2 answers · asked by la 1 in Physics

Question: I've seen huge spiders that run fast in my 32 year old home (I'm scared of spiders) I did became brave and caught one of them. How can I tell if it's a hobo spider or a house spider? Do they look a like? Are they poisonous? I do have pets in the house. That's why I'm asking. My pets are very curious. Is there away to kill them (without harming my pets)? Honest please.

2007-07-24 20:05:53 · 2 answers · asked by Kat 3 in Zoology

The tectonic plates are moving at the rate of about 50 to 100 mm per year. In that case the top layer on tectonic plate that is crest also should move at that rate. Can we find the latitude and longitude of any particular city will change after 1000 of years. What will happen to the other end of tectonic plate boundary?

2007-07-24 19:57:40 · 5 answers · asked by A.Ganapathy India 7 in Earth Sciences & Geology

Function 1 = a/(s^2 +a^2) (a is a constant)

Function 2 = s/(s^2 + a^2) (a is a constant)

2007-07-24 19:53:29 · 2 answers · asked by Anonymous in Mathematics

for example: arrange these fractions to ascending:
1/3,2/4,5/8
1/3,2/8,1/6,2/4,3/5
my teacher said i should get the LCD of the denominators but i don't know how. Please tell me how.
if there is an easiest way to arrange these fractions please tell me how.
i will give points.

2007-07-24 19:41:55 · 4 answers · asked by Jeniv the Brit 7 in Mathematics

2007-07-24 19:35:52 · 2 answers · asked by mo p 1 in Earth Sciences & Geology

2007-07-24 19:34:51 · 1 answers · asked by sivapriyaanjali 1 in Engineering

CaCO3(s)=CaO(s)+CO2(g)
If 4.74 g of calcium carbonate is heated what volume of CO2(g) would be produced when collected at 26C and .997 atm?
Please show me how you got this.TY

2007-07-24 19:34:24 · 4 answers · asked by susanstudio2000 1 in Chemistry

Ive been taking antibiotic for almost a 5 week period now im going on to my 6th week. At the start of the 4th week i started to get really hyper, easily annoyed, and lost some of my libido are these common side effects or should i talk to my doctor?

2007-07-24 19:20:19 · 3 answers · asked by ill*Will 2 in Medicine

2007-07-24 19:16:40 · 2 answers · asked by Muthu N 2 in Mathematics

planets circling the sun? protrons and neutrons circling an electron?

2007-07-24 19:13:28 · 13 answers · asked by fokker_triplane 1 in Astronomy & Space

2007-07-24 19:12:19 · 7 answers · asked by JAMES 4 in Medicine

How do you multiply a GMT time (for example, 13:19) with a duration time (like 10 seconds.)

The examples I gave are the exact problem I need to do, btw. It's for an astrology thing... so how do I do that?

2007-07-24 19:05:52 · 3 answers · asked by Kiki 3 in Mathematics

2007-07-24 18:59:24 · 3 answers · asked by kelleygaither2000 1 in Astronomy & Space