# Questions Asked onMarch 5, 2012

1. ## Chemistry

At equilibrium, the concentrations in this system were found to be [N2] = [O2] = 0.100 M and [NO] = 0.500 M. N2(g) + O2(g) 2NO(g) If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is

2. ## Chemistry

In which direction will the net reaction proceed. X(g) + Y(g) Z(g) .. Kp = 1.00 at 300k for each of these sets of initial conditions? 1) [X] = [Y] = [Z] = 1.0 M a] net reaction goes to the left [this one?] b] net reaction goes to the right c] reaction is

3. ## physics

On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hits the ball with a speed of 25 m/s at an angle of 28°

4. ## geometry

Which type(s) of symmetry does the uppercase letter H have? my answer i believe is reflectional symmetry Which type of symmetry is shown by the lowercase letter w? my answer i believe is rotational symmetry. Could someone please check and explain.

5. ## Physics

Pilots can be tested for the stresses of flying high-speed jets in a whirling "human centrifuge," which takes 1.8 min to turn through 21 complete revolutions before reaching its final speed. 1. What is the angular acceleration?(rev/min^2) 2. What is the

6. ## Chemistry

Consider this system at equilibrium. A(aq) B(aq) Delta H = +750 kJ/mol .. What can be said about Q and K immediately after an increase in temperature? a] Q > K because Q increased.. b] Q>K because K decreased.. c] Q

7. ## Chemistry

consider the following reaction: 2CH3OH(g) yields 2CH4(g) + O2(g) change in enthalpy= 252.8kJ Calculate the amount of heat transferred when 26.0 g of {\rm CH_3OH} (g) is decomposed by this reaction at constant pressure.

8. ## geometry

In the graph below, point D is reflected across the y-axis. What are the coordinates of it's image? The graph looks like D is below the x-axis to the right 3 places from y-axis and down 1 place from x-axis. So would my answer be (3,1)?

9. ## Chemistry

Did I answer this equilibrium question correctly? 2CO(g) + O2(g) 2CO2(g) 1) How will increasing the concentration of CO shift the equilibrium? a] to the right [i chose this] b] to the left c] no effect 2] how will increasing the concentration of CO2 shift

10. ## ENGLISH 11

Richard Bone by Edgar Lee Masters: When I first came to Spoon River I did not know whether what they told me Was true or false. They would bring me an epitaph And stand around the shop while I worked And say "He was so kind," "He was wonderful," "She was

11. ## College Physics Help

A thin rod (length = 1.10 m) is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod may be ignored, compared to the mass of the object fixed to the top of the rod. The rod, starting from

12. ## Chemistry

consider the following reaction: 2CH3OH(g) yields 2CH4(g) + O2(g) change in enthalpy= 252.8kJ How many kilojoules of heat are released when 38.4 g of CH_4 g) reacts completely with O2 (g) to form CH3OH (g) at constant pressure?

13. ## Statistics

5. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? b. What percentage of exams will have

14. ## social studies

Label 2 bays that Hudson saw. I know the answer is Delaware Bay and Chesapeake Bay but I don't know where 2 label them.there's a map in my social studies book but it only talks about the Hudson Bay.There's a map in my book and it says AREA OF HENRY

15. ## Mechanics

A 30.0-kg block is resting on a flat horizontal table. On top of this block is resting a 15.0-kg block, to which a horizontal spring is attached, as the drawing illustrates. The spring constant of the spring is 325 N/m. The coefficient of kinetic friction

16. ## Trigonometry

an airplane over the pacific sights an atoll at a 11 degrees angel angle of depression. if the plane is 410 m above water how many kilometers is it from a point 410 m above the atoll

17. ## College Physics

Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.1x10-8m, and a tangential speed at the rim of 2.0x10-5 m/s. (a) What is the angular speed (the magnitude

18. ## Chemistry

At a given temperature, the elementary reaction A B in the forward direction is first order in A with a rate constant of 2.60 x 10^-2 s^-1. The reverse reaction is first order in B and the rate constant is 8.50 x 10^-2 s^-1. What is the value of the

19. ## AP Chemistry

Cytochrome, a complicated molecule that we will represent as CyFe2+, reacts with the air we breathe to supply energy required to synthesize adenosine triphosphate (ATP). At pH 7.0 the following reduction potentials pertain to this oxidation of CyFe2+:

20. ## physics

A batter hits a pop-up straight up over home plate at an initial velocity of 29 m/s. The ball is caught by the catcher at the same height that it was hit. At what velocity will the ball land in the catcher's mitt? none of these 29 m/s 14.5 m/s -14.5 m/s

21. ## chem

a mixture of 0.156 moles of C is reacted with 0.117 moles of O2 in a sealed, 10.0L vessel at 500K, producing a mixture of CO amd CO2. The total pressure is 0.640 atm. what is partial pressure of CO?

22. ## Geometry

Guy wires 80 feet long support a 65 foot tall telephone pole. To the nearest degree, what angle will the wires make with the ground?

I have to revise these sentences as if speaking to a 10th grade level in education. Can you tell me if these are correct: 1. We must terminate all deficit financing. Revision: We need to end all debts. 2. We must endeavor to correct this problem by

24. ## chemistry

How do you do the hybridization of CBr4?

25. ## Physics

Two blocks, each with a mass = 0.168 kg, can slide without friction on a horizontal surface. Initially, block 1 is in motion with a speed = 1.28 m/s; block 2 is at rest. When block 1 collides with block 2, a spring bumper on block 1 is compressed. Maximum

26. ## geometry

The coordinates of the vertices of triangle CDE are C(1,4), D(3,6), and E(7,4). If the triangle is reflected over the line y=3, what are the coordinates of the image of D? I think (3,-6), but not real sure.

27. ## physics

A box with a mass of 2 kg is lifted (without acceleration) through a height of 8.0 m in order to place it upon the shelf of a closet. (a) What is the increase in potential energy of the box? 1 . J (b) How much work was required to lift the box to this

28. ## Calculus

The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400) a)If the speed limit is 50 km/h, determine the legal speed that will maximize the fuel efficiency. Could someone explain to me why the legal speed

29. ## Chemistry

I did a back titration with an unknown carbonate and using the average % carbonate (by mass) which I found to be 27.40% and appropriate calculation decided where the unknown is an alkali metal carbonate or an alkaline earth metal carbonate. I have no idea

30. ## Physics

Two converging lenses are separated by 23.40 cm. The focal length of each lens is 12.20 cm. An object is placed 35.00 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.

31. ## Physics

A 73.3 kg man steps out a window and falls (from rest) 1.09 m to a sidewalk. What is his speed just before his feet strike the pavement? 4.62 m/s If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.510 cm give in the

32. ## Trig

Prove cos^2t+4cost+4/cost+2=2sect+1/sect

33. ## Chemistry

How many moles of nitric acid will be produced when .51 mole of dinitrogen pentoxide reacts

34. ## Trig

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?

35. ## Chemistry

In phosphoric acid, why is it relatively easy to remove the first proton, considerably harder to remove the second proton, and extremely difficult to remove the third proton in chemical reactions? I'm not sure about this one is it because each time a

36. ## Chem 2

The following system is at equilibrium with [N2O4] = 0.55 M and [NO2] = 0.25 M. If an additional 0.10 M NO2 is added to the reaction mixture with no change in volume, what will be the new equilibrium concentration of N2O4? N2O4(g) 2 NO2(g)

37. ## physics

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 48.0 m below its starting point at a time 5.00s after it leaves the thrower's hand. Air

38. ## physics

A jet of water squirts out horizontally from a hole near the bottom of the tank, as seen in the figure below. Assume that y = 1.19 m and x = 0.544 m. What is the speed of the water coming out of the hole? The hole has a diameter of 3.06 mm. What is the

39. ## Chemistry

1. As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each

40. ## Chemistry

Prepare a theoretical titration curve for titration of 25.0 mL of 0.1037 formic acid (HCOOH; pKa = 3.75) solution (diluted to 100 mL volume with deionized water) by 0.0964 M solution of KOH. I have to determine volume of KOH needed to reach equivalence

41. ## Physics

How far above the surface of Earth would you weigh 63.6 percent of your surface weight?

42. ## physics

A meter stick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with these two fingers. You can calculate your reaction time from the distance the meter stick falls,

43. ## physics

A race car accelerates from 0.0 m/s to 30.0 m/s with a displacement of 45.0 m. what is the car's acceleration ?

44. ## physics

A ball thrown horizontally at 27 m/s travels a horizontal distance of 51 m before hitting the ground. From what height was the ball thrown?

subject and object pronouns write each sentence. replace the underlined words with subject or object pronouns. 1-When some people visited the South Pole, the people wore heavy coats to keep the people warm. underline the word is (the people, the people) my

46. ## Math

the design below grows each day, as shown. if the pattern continues to grow like this, how many tiles will there be in the design on the tenth day? on the fiftieth day? Day 1 1 tile Day 2 5 tiles Day 3 13 tiles

47. ## Chemistry

Suppose 50.0 mL of an aqueous solution containing an unknown monoprotic weak acid is titrated with 0.250 M KOH. The titration requires 31.52 mL of the potassium hydroxide solution to reach the equivalence point. What is the concentration (in molarity) of

48. ## physics

You are playing right field for the baseball team. Your team is up by one run in the bottom of the last inning of the game when a ground ball slips through the infield and comes straight toward you. As you pick up the ball 62 m from home plate, you see a

49. ## Trig

Please help. I can't get this problem at all. When two bubbles cling together in midair their common surface is part of a sphere whose center D lies on the line passing through the centers of the bubble. Also, angles ACB and ACD are 60 degrees. Show that

50. ## Chemistry

Hoe Many moles of each reactant are Needed to produce 3.60 x 10^2g CH3OH?

202. ## math

what is the probability of picking a yellow marble out of a jar of 27 marbles, if 20 of the 27 marbles are green?

203. ## statistics

1. The average number of articles produced by two machines per day is 200 and 250 with standard deviation 20 and 25 respectively on the basis of records of 25 days production. Can you regard both the machines equally efficient at 1% level of significance?

When I said the realizar in my earlier post, I was trying to ask if she liked to see them perform-I thought realizar was to perform which obviously it wasn't. If possible could you tell me what "to perform" would be in Spanish Thank you again for checking

205. ## math

Choose the statement that correctly lists equivalent ratios. A. 1 : 6 = 20 : 120 = 5 : 30 B. 1 : 6 = 4 : 18 = 6 : 36 C. 1 : 8 = 20 : 120 = 3 : 24 D. 1 : 8 = 3 : 32 = 5 : 48

206. ## algebra

grandma ploan to finance her grandchilds college education she has 50,000 to invest use a long range investment pln ,cd,saving bond etc. the plan is to earn compound interest.the principal is(p)50,000 interest rate is (r)3.60years for investment is(6)this

How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate? I don't get it.. it's a question from a lab we did on chromate-dichromate equilibrium.

208. ## CHEMISTRY!!!!

Write two reactions for NaHCO3, reacting with water in one NaHCO3 is acting as acid the other as a base. Is 0.10M solution going to be acidic or basic? Explain. I write the two rxns but what do I do with then...

209. ## physics

a construction wo4rker uses a board and log as a lever to lift a heavy rock. If the input arm is 3 meters long and the output arm is 0.75 meters long, what is the mechanical advantage of the lever?

210. ## English

Writeacher, I included a few sentences for you to check. I wonder if you coud help me organize my ideas more clearly. 1) Winston is tortoured by the Thoughtpolice and threatened that he will be attacked by rats, the thing which he hates most. 2) They make

211. ## Calculus

What values of x is there an absolute minimum for the function y= -1/3x^2 + 2x? I found the derivative of the function which is y'=-2/3x + 2 set it to 0=y'=-2/3x + 2 x=3 What do I do now?

212. ## chemistry

the acid-dissociation constanstant for acetic acid CH3COOH(aq)H+(aq)+CH3COO-(aq) is known to be 1.8X10^-5 at 25C Caclulate G0f forCH3COO-(aq). G0f=-396.56KJ/mol for CH3COOH (aq), 0 Kj/mol for H+ explain your answer

213. ## science

In the fissioning of uranium, a chain reaction is caused by? ejected neutrons. the enormous energy release. the kinetic energy of the decay products. the conversion of mass to energy.

214. ## astronomy

What is theratio of the luminosity per aquare meter coming from a part of the Sun that is 5800 K versus a sunspot where the temperature is 5000 K?

215. ## LIMERICK

I need you to help me check this, please. The Noisy Classroom By:Celest Declaint There once was a classroom named 210 They kept talking and talking again _____________________ ______________________ ______________________ ______________________ i need help

216. ## Physics

A spotlight on a boat is y = 2.6 m above the water, and the light strikes the water at a point that is x = 8.6 m horizontally displaced from the spotlight. The depth of the water is 4.0 m. Determine the distance d, which locates the point where the light

217. ## mathq

Please show me how to work this. A park has two walking paths shaped like right triangles. The first path has legs 75 yd and 100 yd long. the second path has legs 50 yd and 240 yd long. What is the total length of the shorter path, in yards?

218. ## Writing

What better time to kiss the Blarney Stone than March! Help your readers plan a trip to Ireland by writing a travel article with interesting facts about the country My Facts: Want a trip to Ireland? Well you should go because there is a lor of amazing

219. ## Chemistry

You are a lab technician and must create 250 ml of a 17% salt solution. You have available three stock solutions. You have a one liter container of a 5% salt, a 500 ml container of a 28% salt solution, and a 400 ml container of a 40% salt solution. Discuss

3x^2-3x-8

221. ## Calc

Find the volume formed by rotating the region enclosed by: x = 8 y and y3 = x with y ≥ 0 about the y-axis

222. ## Math

The monthly car payments for Ted Nelson's last eight customers were $266,$285, $285,$285, $285,$315, $325, and$344. Decide whether the mode represents these data well. Explain. Please help, I think yes, because it has a mode and it makes up half of the

223. ## Physics

Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a

224. ## Math

The graph of f is shown. Apply Rolle's Theorem and find all values of c such that f '(c) = 0 at some point between the labeled intercepts. (Enter your answers as a comma-separated list.) f (x) = x^2 + 6x − 7

225. ## Spanish-Help

We learned different timeframes in We learned timeframes in Spanish today and I'm stuck with my homework.Please check 1.Yo pedí un taco el restaurante anteayer. I ate a taco in the restaurant the day before yesterday. 2.Bebí un batido en el Mexican

226. ## Trigonometry

Find the angle of elevation of the sun when a tree that is 10 yd tall cast a shadow 14 yds long

227. ## math

Mr.River is driving from Hillsford to Dryden. The distance between the 2 towns is 1715 miles. Mr.River has already driven 580 miles. Which is the best estimate of how much farther he must drive in order to reach Dryden? A.2300miles B.1200miles C.1100miles

228. ## buisness

◦Summarize what you learned in this Orientation Workshop. ◦How will you apply what you learned in this Orientation Workshop to your educational, personal, or professional pursuits?

229. ## MaTH

Simplify the following: 1) 32^1.2 2) (-216)^(-2/3) 3) -(-27)^(-4/3) Note: 32^1.2 is 32 raised to the 1.2 power

280. ## geomatry

I need to creat a parallogram,rectangle,square,rhombus,kite and triangle all should have the same area?

281. ## math

Hello, I need help finding the intersection points B and C of the tangent A with for horizontal axis B and the vertical axis C. hyperbola: f (x) = 1 / x A = (1, 1) Thanks for your help .

282. ## math

How do I draw a reflex angle ZYX so that it measures 255 degrees?

283. ## Math

Thomas is planning on redoing his bathroom floor with tiles measuring 5in by 8in. The floor has an area of 205in square. What is the least number of tiles he will need? I can't not figure this out, can someone please help?

284. ## geometry

There are six marbles in the bag and three of them are purple, three of them are black.

285. ## trig

if sin 7x = cos x+10 find the value of x

286. ## math

1- writing to explain- why might you need to measure a perimeter with a measuring tape instead of a ruler? 2- how are a ruler, a yardstick, and a measuring tape the same? how are they different? i don't 1 answer and i try 2 answer please check is it right

287. ## Psychology

According to Howard independent intelligence:

288. ## Chemistry

Calculate the pH of a 5.90 10-3 M solution of H2SO4 I have tried doing this as pH=-log[H+] and also by multiplying the Molarity by two because there are two hydrogens and then doing the -log but both ways have gotten me the wrong answer is there something

289. ## MATH

TO BUILD A SHELF NDS A BOARD 2 YARDS HAS A BOARD THAT IS 66INCHED LONG. HOW MUCH LONGERR OF A BOARD SHOULD HE USE TO BUILD THE SHELF?

290. ## HSPA REVIEW

-Clue 1: I am a Real Number whose value is less than 1 -Clue 2: I do not end -Clue 3: My digits do not repeat. what kind of number am i?

291. ## science

What is broken up into about 30 sections that move around on the asthenosphere? I'm stuck between plates, crust, and lithosphere. Thanks!

292. ## Physics

It takes 1110 calories of energy to melt a 185 gram lump of lead. What is lead's latent heat of fusion?

293. ## science

Are there hydgrogen bonds between water molecules in the liquid phase No, and if there were, the water would just be ice (a solid). Yes, and they are continually breaking and reforming. Yes, but they rarely ocuur. No, otherwise the water molecules would

294. ## calculus

consider the integral [cos(x^3)dx,0,0.5]. Approximating it by the Midpoint Rule with n equal subintervals, give an estimate for n which guarantees that the error is bounded by 1/10^4

Explain how you know that 7 divided by 9 is less than 1.

296. ## education

According to Leeds, at snack time, children should be given ___ of each food for each year of their lives.

297. ## math

Whst is the elapsed time for 9:59 p.m. to 10:45 p.m.

Solve for x. Provide an explanation, please. -X^2+36=0

299. ## Trig

prove sin(α+β)sin(α-β)=cos^2β-cos^2α

327. ## algebra 2

evaluate f(x) = x^-2/3 + x^-3 for each value of x. f(-8)

328. ## Math

I Have to answer the game, "what's my rule" I've tried everything. I do not know if the teacher made a mistake in the problem. When x=1, y=3 x=2, y=6 x=3,y=12 x=4, y=24 I see that Y is doubling, but I need a rule to use with variable Thanks!

329. ## Statistics

A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ___

330. ## Statistics

A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ___

331. ## Chemical kinetics (chemistry)

if the activation energy is larger from the perspective of the reactants than the products, the reaction is ?

332. ## Maths

Find 8 terms of the arithmetic progression if the second term is 2 and the sixth term is 5

333. ## Chemistry

It is possible, although less accurate, to do a standard addition with only one sample. An unknown Fe sample was analyzed by AAS and gave an absorbance reading of 0.160. To the same sample we added 1.5ppm Fe and the new absorbance reading was 0.205.

334. ## arithmetic

a board 2 yards long. If 6 inches from one end was cut off. How many inches long was the shelf.

335. ## speech

Concerning dictionaries and their proper use, which one of the following statements is most accurate?

A purchaser who is injured by a product has a cause of action by demonstrating all of the following are true except one. The exception is:

337. ## Chemical kinetics (theory)

Explain why a dust is much more explosive than is a stalk of grain.

338. ## Chemistry

It is possible, although less accurate, to do a standard addition with only one sample. An unknown Fe sample was analyzed by AAS and gave an absorbance reading of 0.160. To the same sample we added 1.5ppm Fe and the new absorbance reading was 0.205.

339. ## geography

discuss the nature of economic geography.

340. ## Trig

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α

341. ## kilakila secondary

convert and write in hindu arabic numerals

342. ## Math

I'm in 5th grade and here's my question: I have to write which fraction represents the ratio of corresponding sides? There are 2 triangles. One triangle has the measurements 3in., 9in. and 6in. The other triangle is 18in., 54in. and 36in. Thank you.

343. ## to ms.sue

what should i name my limerick?

344. ## Physics

An audible standing wave is produced when air is blown across a pipe that is open at both ends. If the pipe is 29 cm tall, what is the frequency of sound produced?

345. ## algebra

factor monomial 64xcubic-27

346. ## world cultures

i need help on knowing that the cultural changes between Umayyad and Abbasid. pleaseee! thank you

What is the crucifixion?

348. ## physics

A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.25 s after liftoff, the rocket clears the top of its launch platform, 69 m above the ground. After an additional 4.80 s , it is 1.00 km above the ground. Calculate the

349. ## math

Mr lopez is putting a fence around his vegetable garden the garden is shaped like a rectangle. the larger sides are 14 feet long.and the shorter sides are 9 1/2 feet long how much fencing should mr lopez buy?

350. ## English

I have an e-pal. (In this sentence, what does 'e' refer to? 'Pal' means 'friend.')

351. ## chemistry

Give the concentration in meters when 3.51 moles of HNO3 are dissolved in enough water to make 1.2 liters of solution

352. ## math

Hello I have two questions pleae (1)what does it mean when it says measurement to an 8th of an inch, what will I be doing? (2) can you show me the steps for 10 inches = ________ ft, the answr is 5/6 but how do you get that? Thank you

353. ## Math

Which rectangle below has a perimeter 34 centimeters and area of 60 sqare centimeters

354. ## English

i doing mobile (toy thing) for story sound of hollyhock. it have three string and each string be on different theme. one theme be mental illness, family problem, i not know what other theme be.

355. ## social studies

What are two ways the southeast and southwest cultural regions are similar and different?

356. ## Science

good morning. i am looking for a science fair project for my son who is in kindergarten.

357. ## Trig

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α

358. ## Heat Transfer

Air flows along a 1 m long plate. If the temperature of flow is 0 deg Celsius and the surface temperature of plate is maintained at 30 deg Celsius. Evaluate the heat flow from the plate to air. What are the maximum thickness of the velocity boundary layer