Science & Mathematics - 6 November 2007

2007-11-06 14:56:23 · 2 answers · asked by Anonymous in Biology

2007-11-06 14:54:52 · 2 answers · asked by Anonymous in Biology

If not, what are the factors of it?

2007-11-06 14:52:25 · 11 answers · asked by Anonymous in Mathematics

2007-11-06 14:50:45 · 4 answers · asked by myfrigginjunklist 2 in Physics

answer please.

2007-11-06 14:48:56 · 9 answers · asked by Anonymous in Geography

- Under what conditions would total internal reflection be possible at this interface? Illustrate your answer with a light-ray diagram, or simply explain it in your own words.
- What light travels from crown glass into ethanol? If the angle of incidence of crown glass is 60.00 degrees, what is the angular spread between the red and violet parts of the visible spectrum in the ethanol? Illustrate with a light-ray diagram or explain in your own words.
- Light travels from ethanol into crown glass. What is the Brewster angle in this situation? Illustrate your answer with a light-ray diagram. What is the significance of this angle of incidence?

2007-11-06 14:48:39 · 1 answers · asked by Anonymous in Medicine

2007-11-06 14:48:06 · 8 answers · asked by nene 1 in Engineering

I really don't get this. I have tried to do what I could on my own with no luck! Help please! It looks lengthy so any help is appreciated! Show steps so I can get a understanding!

1. Consider the titration of 35.0 mL of 0.165-M of KX with 0.078-M HCl. The pKa of HX = 5.21. Give all pH values to 0.01 pH units.
a) What is the pH of the original solution before addition of any acid?
b) How many mL of acid are required to reach the equivalence point?
c) What is the pH at the equivalence point?
d) What is the pH of the solution after the addition of 37.0 mL of acid?
e) What is the pH of the solution after the addition of 88.8 mL of acid?

2007-11-06 14:47:50 · 1 answers · asked by crazygirl0630 2 in Chemistry

A car traveling at 50 km/hr skids a distance of 35 m after its brakes lock. Estimate how far it will skid if its brakes lock when its initial speed is 100 km/hr.

2007-11-06 14:47:01 · 2 answers · asked by Anonymous in Physics

answer choices:

1. glycolysis

2. lactate fermentation

3. gluconeogenesis

4. the Krebs cycle

5. electron transfer phosphorylation

2007-11-06 14:46:13 · 3 answers · asked by Sarah 2 in Biology

I was given this physics problem but I'm not too sure on how to approach it. It reads:

For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed out of the heart in a direction that is nearly parallel to the platform. Since momentum must be conserved, the body and the platform recoil, and this recoil can be detected to provide information about the heart. For each beat, suppose that .050 kg of blood is pushed out of the heart with a velocity of +.25 m/s and that the mass of the patient and platform is 85 kg. Assuming that the patient does not slip with respect to the platform, and that the patient and the platform start from rest, determine the recoil and velocity.

Thanks to anyone who attempts this. I'm really stumped and any explanations, tips, and details will be a great help!

2007-11-06 14:44:20 · 3 answers · asked by doubtful 2 in Physics

see it hink it does cuz when it s cold or hot different people have different emotions about the weather

2007-11-06 14:43:09 · 20 answers · asked by ALICE E 1 in Weather

2007-11-06 14:41:21 · 1 answers · asked by sojo3 1 in Chemistry

2007-11-06 14:40:42 · 1 answers · asked by Anonymous in Biology

which part of the phospholipid is "water loving" and "water hating"?

2007-11-06 14:37:47 · 6 answers · asked by Anonymous in Biology

A.Na3AsO4
B.NH4CLO4
C.CA(NO2)2
D.Fe(OH)3

2007-11-06 14:37:17 · 4 answers · asked by manny 1 in Mathematics

Please help me with the equation set up to see how far apart the 2 cities are! Thanks

2007-11-06 14:37:15 · 1 answers · asked by taburke52 1 in Geography

the problem is to (create a cross between 2 heterozygous turtle shurbs include the punnett square and include a phenotypic ratio) TtYyRrBb

2007-11-06 14:36:10 · 2 answers · asked by the student 2 in Biology

A.NaCLO3
B.NH4CLO4
C.(NH4)2CrO4
D.FE(OH)3

plzz help im desperate!

2007-11-06 14:35:54 · 2 answers · asked by manny 1 in Chemistry

A simple pendulum with a length 1.50 m makes 81.6 oscillations in 180 s. What is the acceleration due to gravity at its location? (It is not located on Earth!)

2007-11-06 14:35:30 · 1 answers · asked by Anonymous in Physics

Ok so my teacher really confused me when going over this in class! Please help, I have no clue! Please show your steps. Any help appreciated!

Calculate the pH of each of the solutions and the change in pH to 0.01 pH units caused by adding 10.0 mL of 2.77-M HCl to 400. mL of each of the following solutions.
Change is defined as final minus initial, so if the pH drops upon mixing the change is negative.
a) water
pH before mixing =
pH after mixing=
pH change =

b) 0.193 M C2H3O21-
pH before mixing =
pH after mixing=
pH change =

c) 0.193 M HC2H3O2
pH before mixing =
pH after mixing=
pH change =

d) a buffer solution that is 0.193 M in each C2H3O21- and HC2H3O2
pH before mixing =
pH after mixing=
pH change =
Link to acid base table: http://www.webassign.net/wertz/caqs/html/resource/acidbase_pka.html

2007-11-06 14:35:16 · 1 answers · asked by crazygirl0630 2 in Chemistry

why???

2007-11-06 14:34:30 · 4 answers · asked by Tone 2 in Chemistry

Looks simple enough yet I can't come up with the correct answers. Help please! Please show steps...any help appreciated!

1. What is the pH (to nearest 0.01 pH unit) of a solution prepared by mixing 54.0 mL of 0.0397 M NaOH and 67.0 mL of 0.0203 M Ba(OH)2?

2. What is the pH (to nearest 0.01 pH unit) of a solution prepared by mixing 83.0 mL of 0.526 M HCl and 78.0 mL of 0.595 M NaOH?

Link to acid/base table: http://www.webassign.net/wertz/caqs/html/resource/acidbase_pka.html

2007-11-06 14:30:18 · 2 answers · asked by crazygirl0630 2 in Chemistry

2007-11-06 14:27:48 · 17 answers · asked by Star C 1 in Mathematics

I'm having a terrible time with this. Please help so that I will begin to understand! Please show your steps! I know it looks long so any help at all would be appreciated!

1. What is the value of the equilibrium constant (three sig figs) for the reaction of hydrofluoric acid and ammonia?
K =
Fill in the following reaction table with mmol (to the nearest 0.01 mmol) for the reaction occurring when 44.7 mL of 0.222-M ammonia are mixed with 27.6 mL of 0.292-M hydrofluoric acid.
HF + NH3 ↔ F1- + NH41+
initial
delta
final
What is the final concentration of ammonium ion to three significant figures?

How many mmols (three sig figs) of the limiting reactant are actually present at equilibrium? This value is not based on the final amount shown in the table because the table assumes complete reaction (not equilibrium) of the limiting reactant.

Link to acid/base table: http://www.webassign.net/wertz/caqs/html/resource/acidbase_pka.html

2007-11-06 14:27:18 · 2 answers · asked by crazygirl0630 2 in Chemistry

2007-11-06 14:26:03 · 1 answers · asked by Anonymous in Biology

2007-11-06 14:25:30 · 2 answers · asked by scrub 2 in Physics

round off to nearest whole number ..... thx so much !

2007-11-06 14:24:00 · 1 answers · asked by lori gurl 1 in Mathematics

2007-11-06 14:23:06 · 3 answers · asked by tash 1 in Engineering

WHEN SCHOOL ENDS AT 2:30 P.M., JACOB STARTS TO WALK HOME AT A RATE OF 3.0 MILES PER HOUR.IF HIS BROTHER LEAVES SCHOOL 5 MINUTES LATER AND WALKS AT A RATE OF 3.6 MILES PER HOUR, AT WHAT TIME WILL HE CATCH UP TO JACOB? SHOW ALL WORK PLEASE

2007-11-06 14:22:02 · 2 answers · asked by almeda_94 1 in Mathematics