# Questions Asked onApril 10, 2012

1. ## chemistry

Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added to (a) 35.0 mL of 0.300 M NaOH(aq). (b) 40.0 mL of 0.350 M NaOH(aq).

2. ## Geometry

You are planning to use a ceramic tile design in your new bathroom. The tiles are blue-and-white equilateral triangles. You decide to arrange the blue tiles in a hexagonal shape as shown. If the side of each tile measures 7 centimeters, what will be the

3. ## Chemistry

A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is: CaCO3(s)+2HCl(aq) -> CaCl2(aq) + H2O(l) + CO2(g) The excess HCl(aq) is titrated by 9.75 mL of 0.125 M NaOH(aq). Calculate the mass

4. ## Chemistry

16. You have a series of four chemical reactions (1--> 2 --> 3 --> 4). How do you calculate the H2 if you know the other H values? H2 = (H1)(H3)/(H4) H2 = H4 (H1 + H3) H2 = H1 + H3 + H4 H2 = H1 + H3 H4

5. ## Chemistry

12. In a calorimeter, 10 g of ice absorbs heat with an enthalpy of fusion of 334 J/g. What is the heat absorbed? q = mCHf I am having a lot of trouble on this type of problem in chem. Help and an explanation would be greatly appreciated. Thank you.

6. ## Chemistry

17. You have the following equations: 2S (s) + 3O2 (g) 2SO3 (g), H = 792 kJ 2S (s) + 2O2 (g) 2SO2 (g), H = ? 2SO2 (g) + O2 (g) 2SO3 (g), H = 198 kJ What is the missing H?

A championship golfer uses a nine iron to chip a shot right into the cup. If the golf ball is launched at a velocity of 20 m/s at an angle of 45° above the horizontal, how far away was the golfer from the hole when he hit the ball? What maximum height did

8. ## Area Geometry

Find the area of a decagon with a radius of 4mm. Find the area of an octagon with a radius of 10 cm.

9. ## to ms.sue

thank you ms.sue.i will remember you forever! here's a special poem for you! ms.sue, she's my favorite teacher too. she gives me ideas, mama-mia. sometimes I ask her questions twice, she is super nice. give a hip hip hooray, today, for the best volunteer,

10. ## math

two billion,six hundred million in expanded notation using powers of 10 (2x 10^11) + (6x10^8) would that be correct??

11. ## Physics

The figure below shows two current carrying wires and the directions of the currents they carry. The wires carry the following currents: I1 = 7.1 A and I2 = 8.9 A. Wire 1 is at (0, 5.8) mm; wire 2 is at (15.1, 0) mm; point P is at (15.1, 5.8) mm. Wire 1 is

12. ## Geometry

An equilateral triangle has a height of 26 inches. What is the length of each side of the triangle to the nearest centimeter?

13. ## physics

Calculate the net charge on a substance consisting of a combination of 4.3 multiplied by 1013 protons and 2.5 multiplied by 1013 electrons.

14. ## Geometry

A professional baseball diamond is a square. The distance from base to base is 90 ft. To the nearest foot, how far does a catcher standing at home plate throw the ball across the diagonal of the square to second base?

15. ## Geometry

A square has diagonal length 13 m. What is the side length of the square to the nearest centimeter?

16. ## math/physics

Forces with magnitudes of 2000 newtons and 900 newtons act on the machine part at angles of 30 degrees and -45 degrees respectively, with the x-axis. Find the direction and magnitude of the resultant of these forces.

17. ## physics

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

18. ## Chemistry

HOBr (aq) H+ (aq) + OBr- (aq), Ka = 2.3 x 10^-9 Hypobromous acid, HOBr, is a weak acid that dissociates in water, as represented by the equation. (a) Calculate the value of [H+] in a solution of HOBr that has a pH of 4.95. Ans: 1.1 * 10^-5 M (b) Write the

19. ## Geometry

You set up a makeshift greenhouse by leaning a square pane of glass against a building. The glass is 4.5 ft long and it makes a 30 degree angle with the ground. How much horizontal distance between the building and the glass is there to grow plants? Round

20. ## Physics

A stream moving with a speed of 0.5 m/s reaches a point where the cross-sectional area of the stream decreases to one-fourth of the original area. What is the water speed in this narrowed portion of the stream?

21. ## economics

A firm that sells e-books – books in digital form downloadable from the Internet – sells all e-books relating to do-it-yourself topics (home plumbing, gardening, and so on) at the same price. At present, the company can earn a maximum annual profit of

22. ## Chemistry

Ammonia (NH3) boils at -33oC; at this temperature it has a density of 0.81 g/cm3. The enthalpy of formation of NH3(g) is -46.2kj/mol, and the enthalpy of vaporization of NH3(l) is 23.2 kJ/mol. Calculate the enthalpy change when 1 L of liquid NH3 is burned

23. ## physics

Boxing gloves are padded to lessen the force of a blow. (a) Calculate the force exerted by a boxing glove on an opponent's face, if the glove and face compress 7.00 cm during a blow in which the 8.00 kg arm and glove are brought to rest from an initial

24. ## physics

The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.00 kg (N.B. as you know, the scale should read N, but no one told the manufacturer). The distances in the figure (which is not to scale) are: D1 = 9.0 cm, D2 = 8.0 cm, and

25. ## physics

An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electric force acting on the alpha particle when the alpha particle is 1.7 multiplied by 10-14 m from the gold nucleus? N

26. ## Physics/math

A gun with a muzzle velocity of 1200 feet per second is fired at an angle of 6 degrees with the horizontal. Find the vertical and horizontal components of the velocity.

27. ## accounting

What items appear in financial statements of merchandising companies that do not appear in the financial statements of service companies? Why is there a difference?

28. ## Chemistry

You have 250mL of a 0.56M solution of sodium acetate. How many mL of 0.50M acetic acid should be added to make a buffer of pH 4.40? I think this is a buffer system so I would use pH=pka + log base/acid so would I set this up as 4.40 = 4.74 + log base/

29. ## Chemistry

One enzyme- catalyzed reaction in a biochemical cycle has an equilibrium constant (K1) that is 10 times the equilibrium constant (K2) of a second reaction. If the standard Gibbs energy of the former reaction is - 300 kJ mol-1, what is the standard reaction

30. ## physics

A pebble drops straight down into a tub of water, setting off ____________________ waves that travel at the boundary between the water and air.

31. ## physics

Using energy considerations, calculate the average force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 6.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.

32. ## Chemistry

Hydrogen Peroxide decomposes to produce oxygen gas and water, What mass of hydrogen peroxide (H2O2) nust decompose to produce 0.77 grams of water?

33. ## physics

During a workout, the football players at State U. ran up the stadium stairs in 61 s. The stairs are 145 m long and inclined at an angle of 30°. If a typical player has a mass of 105 kg, estimate the average power output on the way up. Ignore friction and

34. ## Chemisty

A patient has been trying to achieve total blood cholesterol of 175 mg or less per 100 mL. A recent test result of a 3 mL blood sample found that 4.95 mg cholesterol were present. Has the patient reached the goal?

35. ## Geometry

An equilateral triangle has a perimeter of 120 inches. What is the area of the triangle? Express your answer in simplest radical form.

36. ## Physics

A horizontal segment of pipe tapers from a cross sectional area of 50 cm2 to 0.5 cm2. The pressure at the larger end of the pipe is 1.26 105 Pa and the speed is 0.029 m/s. What is the pressure at the narrow end of the segment? Pa Please help! physics -

37. ## Algebra2

how do you solve this? A dice is rolled twice. What is the probability of getting a multiple of 3 on the first roll or a total of 7?

38. ## Science

Which answer best describes the purpose of the muscles in the human body? A)to protect tissues and form blood B)to remove and use nutrients from food C)to produce movement and provide support D)to combine blood and oxygen needed for movement

39. ## physics

Using energy considerations, calculate the average force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 6.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.

40. ## Geometry

Children climb 8 ft to the top of a slide. The end of the slide is 1 ft above the ground and the slide rises at a 45 degree angle. If the slide makes a straight line from the top to the bottom, how far does a child travel down the slide? Round to the

41. ## Statistics

Cellular Phone Sales The probability that a cellular phone company kiosk sells X number of new phone contracts per day is shown below. Find the mean, variance, and standard deviation for this probability distribution. X 4 5 6 8 10 P (X) 0.4 0.3 0.1 0.15

42. ## mechanics of machines

A body of weight 500N is lying on a rough plane inclined at angle 3.2 with the horizontal. It is supported by an effort p, parallel to the plane. Determine the minimum and maximum value of P, for which the equilibrium can exist if the angle of friction is

43. ## Chemistry

What mass of sodium chloride is produced when chlorine gas reacts with 0.29 grams of sodium iodide? Unbalanced equation is given below: NaI + Cl2 -> NaCl + I2

44. ## chemistry

What volume will 12.0 g of oxygen gas occupy at 25 degrees celcius and a pressure of 52.7 kPa?

45. ## physics

A U-shaped tube is partly filled with water and partly filled with a liquid that does not mix with water. Both sides of the tube are open to the atmosphere. If h1 = 0.46 m and h2 = 0.25 m, what is the density of the liquid? on the left side of the tube is

46. ## chemistry

The decomposition of potassium chlorate, KClO3, gives oxygen gas and solid potassium chloride. How many grams of KClO3 are needed to produce 5.00 L of Oxygen gas at STP? Suppose that the reaction described above produces 4.80 L of O2 in the laboratory.

47. ## Chemistry PLZ HELP!!!!!

give equations showing the commercial methods for preparations of the halogen (F2, Cl2, Br2, I2)

48. ## Chemistry

1. Calculate the acetylsalicylic acid concentration (in mg/mL) of aspirin solution #2 in the Procedure section. Assume that 300 mg of acetylsalicylic acid has been weighed out. 2.3. (3 pts) Calculate the acetylsalicylic acid concentrations (in mg/mL) of

49. ## Chemistry

I need help ASAP! Colligative Properties- Ethylene glycol (C2H6O2) is the principal ingredient in antifreeze. How many grams of ethylene glycol will be needed to lower the freezing point of 2100 grams of water by 20 degrees celcius?

99. ## Statistics

From a random sample of 500 registered voters in Los Angeles, 400 indicated that they would vote in favour of a proposed policy in an upcoming election. a) Test at the 10% significance level a politician’s statement that “those who are in favour of

100. ## physics

To say a substance is electrically polarized is to say that its net charge is ____________________. A) either negative or positive, but relatively weak.B) weakly positive in sign.C) None of these.D) is normally zero with opposite charges on opposite

101. ## Finance

ABC Drilling has debt with a market value of $200,000 and a yield of 9%. The firm's equity has a market value of$300,000, its earnings are growing at a 5% rate, and its tax rate is 40%. A similar firm with no debt has a cost of equity of 12%. Under the MM

102. ## arithmetic

Determine the 10th and 21st terms of the arithmetic sequence- 4+7x, 5+9x, 6+11x

103. ## calculus

the management of a company has decided that the level of its investment should not exceed C dollars. Furthermore, managament has decided that the rate of net investment (the rate of change of the total capital invested) should be proportional to the

104. ## chemistry

A volatile liquid was allowed to evaporate in a 43.298g flask that has a total volume of 253 mL. The temp of the water bath wad 100 °C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vaporous was 44.173g. Calculate the molar

105. ## Math (Algebra)

I am having a bit of trouble with the question stated below. I am home-schooled and learning math on your own has proven to be quite the difficult task. If someone could please explain how to do this as thoroughly as possible, I would greatly appreciate

106. ## SS7R - Bill of Rights Project

3rd Amendment In the 3rd Amendment homeowners donâ€™t have to put of soldiers in their homes. No soldier shall, in time of peace be quartered neither in any house, without the consent of the owner, nor in time of war, but in a manner to be prescribed

107. ## physics

The source of all wave motion is ____________________. A) something vibrating.B) a harmonic object, or system of objects.C) any energy source.D) a region of high and low pressures.E) transverse motion.

108. ## Social Studies 7R - Bill of Rights Project

What are the 8 amendments and what are their jobs (that includes interesting facts)? Is their a website for that. Plus make sure it's on a 7th grade social studies level. Thank You! :)

109. ## Math

Verify the identity & Justify the step.s cot (theta-pi/2)=-tan theta

110. ## intermediate algebra

Short answer.The lenght of the side of a rectangular desk is given by 5x-8y cm.The lenght of the front is given by 5x+8y cm.What is the algebraic expression for the are of the top of the rectangular desk?Include the correct units as part of your answer

111. ## Math

Find the value of csc Q for angle Q in standard position if the point at (3, –1) lies on its terminal side.

112. ## physcis ! HELP !!!!

which of collowing situations describe a particle that might have a non-zero velocity? canbe more than one A) a particle that has a constant position as a function of time B) a particle that has its position changing as a fnction of time c)when you graph

The far point of a nearsighted person is 5.8 m from her eyes, and she wears contacts that enable her to see distant objects clearly. A tree is 18.7 m away and 1.8 m high. (a) When she looks through the contacts at the tree, what is its image distance? (b)

213. ## Calculus

Please verify the answers~ Thank you! 1. Which of the following is the x-intercept of the plane 2x-4z+1=0? a) P(2,0,-4) b) P(0,0,0) c) P(-1/2,0,0) d) P(0,0,1/4) Answer is C. 2. Which of the following is not a direction vector for the plane 3x-2y-z+4=0? a)

214. ## Chemistry

When an excess of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 4.01C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

215. ## ALGEBRA

Find three ordered pairs that satisfy the equation. y = 5 x - 4 (0, ), (1, ), (2, )

216. ## Math

3 black beads and 3 white beads are placed on a string in a circular fashion. How many possible color arrangements are there? *Reiny answered the question...just want to check my answers as to the color arrangements. Anyone?

217. ## English

I left out two last sentences on history. Thank you very much, Writeacher. 1) The 14th century was also marked by the rise of a religious movement of reforms called Lollardy, whose leader was John Wycliffe. 2) The movement, which began at Oxford University

218. ## Math

Three black and three white beads are arranged on a string forming a circular bracelet. How many different color combinations are possible?

219. ## ALGEBRA

Find three ordered pairs that satisfy the equation. y = x + 2

220. ## ALGEBRA

Assume f(x) = x2 + 3. Find the functional value requested. f(-7) =

221. ## healthcare reimbursement

What is the difference between hospital claims processing and professional (provider and/or CMS 1500) claims processing?

222. ## language arts

I've got one more question on conjunctions. The sentence is "One bird you are sure to see is McKay's bunting, which breeds here (and, but) nowhere else." I was thinking it might be but since it is contrasting but wasn't sure. Thanks.

223. ## Chemistry

What 3 compunds can be used to prepare oxygen in the laboratory? What are the reactions for each of the three compounds?

224. ## Statistic

Out of 150 ST130 students in 2010, 52% passed. A sample of 30 randomly selected ST130 students resulted in 65% passed. i. Describe the population and sample. ii. Identify the parameter and give its value.

225. ## Chemistry

If you have 250 mL of 2 M of sodium sulfate diluted to make 0.500 M of sodium sulfate, how would you figure out the volume?

226. ## physics

If the critical angle of a liquid is 41.4 degrees find the index of refraction for that liquid

227. ## math

________% of 16= 12 ________% of 24= 6

228. ## to Lizzy and ms.sue

thank you lizzy. thank you ms.sue.your strategy really helps me alot faster and easier.

229. ## math

5 4 5a 2a 10b b 40 2 6 ? 2 5c What is the missing algebraic expression? Express your answer in terms of c.

230. ## grammar

1. If we can meet with the patient and he / him / himself, we can discuss possible alternative treatments. A) he B) him C) himself 2. An argument between her boyfriend and her / she resulted in the latest injury. A) her B) she 3. The patient’s son is

231. ## Arithmetic

Find a geometric series which has a third term of 7/4 and a sum to infinity of 14.

232. ## science

a 40kg student goes to jupiter where the rate of acceleration is 24.5m/s squared what is the students weight on jupiter?

233. ## ALGEBRA

Assume f(x) = x2 + 3. Find the functional value requested. f(-7)

234. ## Calculus

Given: available material= 1200cm^2 Box w/ square base & open top Find: Largest possible value of the box Can anyone give me a detailed, step-by-step explanation for this problem. I'm studying for an exam and have been working on this for awhile. The help

235. ## science

can you save money on your electric bill from a regular electric company by choosing to use a percentage of wind power through them? Or does it make your bill higher?

236. ## Math

Tasha saw a sailboat while walking along the pier. She thinks it is the tallest sailboat she has ever seen. The shadow cast by the boat was 14 ft long, while Tasha's shadow was only 2 ft long. If Tasha is 5.5 ft tall, how tall was the sailboat, in feet?

237. ## physics

what are the methods of computing the veolicty of a particle in one- dimensona motion from a graph ?

238. ## Geometry

Circle C is centered at (-4,3). Write the equation of the line tangent to circle C at point P(2,5). (point-slope form)

239. ## HCS/490

Do employers have the right to screen employees or potential employees to learn if they are smokers, have chronic diseases, or are overweight? Explain.

240. ## ALGEBRA

$$x = \dfrac{1}{{\color{red}2}} y^2$$

241. ## physics ! HELP PLEASE !!!!1

what are the methods of computing the veolicty of a particle in one- dimensona motion from a graph ?

242. ## math

Please can you Use an example to explain whether multiplying the same number to each value in the data set will affect its variance, give the relationship

The chart below shows an expression evaluated for four different values of x x: x2+x+5: 1 7 2 11 6 47 7 61 Josiah concluded that for all positive values of x, x2+x+5 produces a prime number. Which value of x serves as a counterexample to prove Josiah’s

244. ## Chemistry

I did a chem lab and now im not sure if im doing my calculations right .. Please help? So i have to find out what ƒÉ will equal when i use the equation ƒÉ=d*(a/ãa^2+b^2) in my experiment i found out that a equals 108 cm, d and b were given to me ..

245. ## Algebra 2

The sum of two numbers is 100. One number is four more than three time the other number. What are the last numbers?

246. ## Pyreenes Mountain Range

Are there are col fields a long the Pyrenees Mountain range?

247. ## organic chemistry

what happens to so3 when placedat high temp?

248. ## Intermediate algebra

Essay.show work Find the following product.(y-10)^2

249. ## Computer Question for school

is there a way to, on an online video, copy the screen? I am watching a direct instruction for schoolwork and don't know if i can, can I?

250. ## Physics

in an impulse/ change in momentum problem where mv(final)-mv(initial)=Ft if the initial velocity is zero can i cancel out the masses?

251. ## ms.sue

can you give me an easy way how to find percentages these ways: _____% of ___?_____ = ___?____ __?___ of ________=_________

252. ## math

find T so x-3 is a factor of f(x)=x^3-4x^2+Tx+3

253. ## math

(3n^2 + 4n) + (n^2 + n) = _____

254. ## English

Thank you very much. Here are some more sentences on the same subject. Thank you. 1) The Hundred Years' War received a severe check from the 'Black Death', the bubonic plague which spread all over England in 1348. It was caused by fleas living on black

255. ## ecology

Could someone please tell me what is meant when people say that wind energy can be expensive or more expensive than fossil fuels?

256. ## language arts

Having trouble deciding on a review question between and or but. The sentence says, "Newton's ideas about motion are called laws, (and, but) Einstein's idea about relativity is called a theory." Thanks.

257. ## algebra

subtact (4y^5+3y)-(-2y^5-8y+9)

258. ## math

what is the answer and estimation for 404x2

Rising Cost of Health Care

260. ## math

What equilateral triangle would have the same area as a triangle with side 6, 8 and 10?

261. ## calculus

solve the firs-order differential equation by separating variables y'=xy^3/√(1+x^2)

262. ## SS Help!

The 2nd amendment is "the right of the people to keep and use bear arms". what does Right to keep and bear arms means??? (please tell in a 7th grade level)

263. ## calculus test corrections. 1 question

Describe the linear programming situation for this system of inequalities. x < 1 y > 0 3x + y < 5 the answer is unbounded. please tell me why

264. ## math

a yellow marble will be drawn from a bag containing 2 black and 6 yellow marbles. what best rep[resents the probability of the event? 0%/25%/50%/75%/100%

265. ## physics

a 15 kg bucket is raised to paint a ladder with an acceleration of 3 m/s.^2 what is the tension in the rope?

267. ## math

(5s + t) + (-3s + 4t)=

268. ## math

(2a + 3b + c) + (a + 3b + -4c) =?

269. ## Math

If twenty people in a factory make 43 shoes in [(3)^.5] / 2 hours, then how many shoes do they make in an eight hour day? 397?

270. ## English

I left out the following sentences.Thank you very much.I need to rephrase number 5 and make it more concise. 1) By the 14th century a new middle class, both rural an urban, existed. The merchants increased their power by loaning money to the king for

271. ## Science

an object will sink with a density of what?

272. ## Algebra 2

which of the following are not polynomials? A. x^4+ πx^3+√2x B. 3x+x^4 C. 4x^3+2x^2+ √x D. 2x^3/5-x/3+π E.x/4-5/x+10

273. ## english

In the sentence: "Are you already almost finished?" "Are" is functioning as a linking verb. True or False

274. ## Math

The time it takes Javier to go to school and his walking rate are inversely proportional. If it takes him 12 mins walking at 3 mph how long does it take if he walks at 4 mph?

275. ## money

how would you ask someone for money for school???

276. ## English

I have been writing this story for English class and would love some input on what i should add to this story. I don't want it to make it a sappy story either. Also sorry for the grammar errors i haven't perfected it yet. The last man on earth sat alone in

277. ## math

what is the derivative of y=ln(x/4)

278. ## math

(5x^2 + 9) + (7x^2 + -8)