# Questions Asked onApril 4, 2013

1. ## Chemistry

An ideal gas is contained in a cylinder with a volume of 5.0 102 mL at a temperature of 30.°C and a pressure of 710. torr. The gas is then compressed to a volume of 38 mL, and the temperature is raised to 827°C. What is the new pressure of the gas? torr

2. ## chemistry

CH3NH2(aq)+H2O(l)=>CH3NH3+(aq)+OH-(aq) Kb=4.4 x 10^-4 Methylamine, CH3NH2, is a weak base that reacts with water according to the equation above. A student obtains a 50.0 mL sample of a methylamine solution and determines the pH of the solution to be

3. ## Chemistry

The elements lithium and oxygen react explosively to from lithium oxide (Li2O). How much lithium oxide will form if 3.03 mol of lithium react? Answer in units of mol

4. ## Help? Math

Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark

5. ## Chemistry

Sodium methanoate, NaHCOO, and methanoic acid, HCOOH, can be used to make a buffer solution. Explain how this combination resists changes in pH when small amounts of acid or base are added. Buffers kind of confuse me and I'm not sure how to start this. Can

6. ## Physics

The ski slopes at Bluebird Mountain make use of tow ropes to transport snowboarders and skiers to the summit of the hill. One of the tow ropes is powered by a 22-kW motor which pulls skiers along an icy incline of 14° at a constant speed. Suppose that 18

7. ## chemistry

The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.4. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq). (b) after addition of 25.0 mL of HCl (c) after addition of 50.0 mL of

8. ## Math

Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark

9. ## Math

Find the APR (true annual interest rate), to the nearest half percent, for the following loan. Amount Financed = $1200 Finance Charge =$90 Number of Monthly Payments = 12

10. ## chemistry

In the reaction between formic acid (HCHO2) and sodium hydroxide, water and sodium formate (NaCHO2) are formed. To determine the heat of reaction, 75.0 mL of 1.07 M HCHO2 was placed in a coffee cup calorimeter at a temperature of 20.8 °C, and 45.0 mL of

11. ## physics

An electron is accelerated from rest through a potential difference that has a magnitude of 2.90 × 107 V. The mass of the electron is 9.11 × 10-31 kg, and the negative charge of the electron has a magnitude of 1.60 × 10-19 C. (a) What is the

12. ## chemistry

A 50.00-mL sample of groundwater is titrated with 0.0900 M EDTA. Assume that Ca2 accounts for all of the hardness in the groundwater. If 11.40 mL of EDTA is required to titrate the 50.00-mL sample, what is the hardness of the groundwater in molarity and in

13. ## physics

A sled is accelerating down a hill at a rate of 1 m/s2 . If the mass of the sled is suddenly cut in half and the net force on the sled is doubled, what is the acceleration of the sled?

14. ## Analytical chemistry

A 25.0-mL solution of 0.0660 M EDTA was added to a 33.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0450 M Ga3 solution until all the EDTA

15. ## Precalculus with Trigonometry

Prove or disprove the following identity: (sin(10x))/(sin(x)+sin(9x)) = (cos(5x))/(cos4x))

16. ## Math

For n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x successes. Round your answer to four decimal places n = 10, p = 1/7, x = 3 A. 0.1189 B. 0.1546 C. 0.1308 D. 0.1427

17. ## Chemistry

How many grams of CuSO4 * 5H2O are needed to prepare 100mL of a 0.10 M solution ?

18. ## math

find the value of k such that the equation e^(2x)=krootx has exactly one solution.

19. ## Chemistry

Calculate the change in pH if 0.050 g of solid NaOH is added to 250 mL of a buffer solution that contains 0.80 M NaH2PO4 and 0.17M Na2HPO4. I found the pH of the buffer solution to be 6.54.

20. ## Chemistry

How many milliliters of 1.0 M NaOH must be added to 200. mL of 0.10 M NaH2PO4 to make a buffer solution with a pH of 7.50? (5 points)

21. ## Chmeistry

Estimate the uncertainty in the speed of an oxygen molecule if its position is known to be +/- 3 nm. The mass of an oxygen molecule is 5.31 x 10^26 kg.

22. ## Alg 1

A baseball player hit a ball with an upward velocity of 46 ft/s. Its height h is feet after t seconds is given by the function h = -16t^2 + 46t + 6. What is the maximum height the ball reaches? How long will it take the baseball to reach the maximum

23. ## Chemisrty

How many grams of KClO3 must react to form 42.0 mL?

24. ## Math

The advertised size of a pizza is the length of its diameter. What is the area of the curst of a 16-ince pizza?

25. ## maths

a matrix X has a+b rows and a+2 columns while the matrix Y has b+1 rows and a+3 columns. both matrices XY and YX exist. find a and b. can you say XY and YX sre of same type? are they equal?

26. ## Spanish

(Querer) saber qué pasó. What would be the correct answer for the above statement. My answer is Quería saber qué pasó.

81. ## Physics

A 2.0-ohm resistor is connected in series with a 20.0-V battery and a three-branch parallel network with branches whose resistances are 8.0 ohms each. Ignoring the battery's internal resistance, what is the current in the battery?

82. ## Analytical chemistry

Calculate pCd2 at each of the following points in the titration of 40.00 mL of 0.0040 M Cd2 with 0.0040 M EDTA in the presence of the auxiliary complexing agent NH3. The solution is buffered at a pH of 11.00. Take the NH3 concentration to be a constant

83. ## Chem

How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

84. ## chemistry

3. Based on your answer in question 2, determine the percent error of your calculated specific heat capacity value of your unknown metal using the specific heat capacities of known metals below. Metal Specific Heat Capacity Nickel 0.440 Tin 0.210 Silver

85. ## calc

Given that a window entails a rectangle capped by a semi-circle, given that the semi-circle’s diameter concides with the rectangle’s width, given that the window’s outside (linear and curvilinear) perimeter is 24 feet, and given that the

86. ## Physics

For safety in climbing, a mountaineer uses a nylon rope that is 55 m long and 0.9 cm in diameter. When supporting a 88-kg climber, the rope elongates 1.4 m. Find its Young's modulus.

87. ## Life Orientation

Identify and describe 3 environmental health hazard that cause ill health,crises and or disasters within your community or any other community within South Africa and globally .include evidence that is current of the identified issues

88. ## physics

Four acrobats of mass 61.0 kg, 68.0 kg, 62.0 kg, and 55.0 kg form a human tower, with each acrobat standing on the shoulders of another acrobat. The 61.0-kg acrobat is at the bottom of the tower. If the area of each of the 61.0-kg acrobat's shoes is 370

A store is selling a sweater on sale for $17.90. The regular price is$22.95. What percent of the regular price is the sale price?

90. ## Henri Laurent. Essay. Confuzzled

So I have to write an essay and it says what would I do if I were Henri Laurent. Who is he? Thanks

91. ## Algebra 2

The simple formula for the nth term of an arithmetic sequence is an = 4n + 16. What is the explicit formula corresponding to the simple formula?

92. ## physics

A man fires a rock of a slingshot directly upward.The rock has an initial velocity of 15m/s.How long will it take for the rock to return to the level he fired it at?

93. ## science computer

accept input age, height and weight for some people. The loop will stop when the user enters value 0 for age. Calculate average for age, height and weight, and print the number of people and average age, height and weight.

94. ## English

Which of the following is NOT true about persuasive speaking compared to informative speaking? A. Involves more emotional appeal. B. Asks for commitment from the audience. C. Impartial point of view. D. Emotion-evoking language. is it C

95. ## chemistry

How many grams of water can be cooled from 35^\circ {\rm C} to 16^\circ {\rm C} by the evaporation of 57{\rm g} of water? (The heat of vaporization of water in this temperature range is 2.4 {\rm kJ}/{\rm g}. The specific heat of water is 4.18 {\rm J}/{\rm

96. ## math 140

If 5 is added to a number the sum is tripled, the result is 31 more than the number. Find the number.

97. ## English

1. “To persuade my audience that drinking and driving laws should be stricter” aims for: A. passive agreement with a policy. B. active agreement with a policy. C. personal action to support a policy. D. personal agreement to support a policy. is it C

98. ## Analytical chemistry

A 24.393 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 80.601 g of water. A 12.404 g aliquot of this solution is then titrated with 0.1059 M HCl. It required 31.61 mL of the HCl solution to reach

99. ## a. chem

A 50.0 mL sample containing Cd2 and Mn2 was treated with 58.7 mL of 0.0500 M EDTA. Titration of the excess unreacted EDTA required 17.7 mL of 0.0300 M Ca2 . The Cd2 was displaced from EDTA by the addition of an excess of CN–. Titration of the newly freed

100. ## Math

When Multiplying Fraction You Must Find A Common Denominator. True Or False

101. ## Math

How many 6 inch pieces can you cut from a spool of ribbon that is 10 yards long?

102. ## PHYSICS

Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach

103. ## math

nadia can paint a room in 5 hours Nat can paint the same room in 7 hours how long will it take for both of them to finish painting the same room

104. ## Math

A garden supply company sells cages for tomatoes. The cages come in either black or silver. To decide how many of each color to stock, the purchaser looks at the sales from last year. He finds that 1/3 of the cages sold were black. Last year the company

105. ## Calculus

please help!!!!Apply newtons method to approximate the x-values of the indicated points of intersection of the 2 graphs. continue the process until 2 successive approximations differ by less than 0.001. (Hint: Let h(x)=f(x)-g(x)) f(x)=x^6 g(x)=cos(x) x=

106. ## Physics

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field

107. ## Physics

An electron has a kinetic energy of 7.00 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 4.40 10-5 T. Determine the radius of the path?

108. ## Physics

A long, narrow rectangular loop of wire is moving toward the bottom of the page with a speed of 0.021 m/s (see the drawing). The loop is leaving a region in which a 2.7 T magnetic field exists; the magnetic field outside this region is zero. During a time

Solve for the value of x: 6log(x^2+1)-x=0

110. ## Chemistry

Ca(OH)2, CaF2, NH4NO3, KNO3, HNO3 - Arrange the solutions from most basic to most acidic. I know Ca(OH)2 will be most basic and HNO3 will be most acidic, but how do you determine for the other ones?

111. ## Calculus

A table of values for f,g,f′, and g′ are given in the table below: x f(x) g(x) f′(x) g′(x) 5 0 -4 -9 5 0 5 0 -6 9 -4 5 5 9 -5 If h(x)=f(g(x)), find h′(5), If H(x)=g(f(x)), find H′(0)

112. ## physics

a cannon with a mass of 1200 kilograms is positioned at the edge of a cliff where it fires a 100 kilogram cannonball horizontally. The cannonballs initial speed is 35 meters per second. What is the recoil of speed of the cannon.

113. ## math

A baseball diamond has 90 ft. between each base. A softball diamond has 60 ft between each base. How many yards longer is the space between bases on a baseball diamond than a softball diamond?

114. ## Physics

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field

115. ## Life Orientation

Identify and describe 3 environmental health hazard that cause ill health,crises and or disasters within your community or any other community within South Africa and globally .include evidence that is current of the identified issues

127. ## Math

At a banquet, the ratio of hot drinks to cold drinks was 5 to 3. A total of 400 drinks were served. How many were hot?

128. ## early childhood

Name four child characteristics that might make a preschool child hard to identify as talented or gifted.

129. ## Chemistry

What is the molarity of an aqueous solution containing 27.3 g of glucose (C6H12O6) in 1.7 L of solution?

130. ## Trigonometry - Cosine of angle

What is the cosine of the angle between two adjacent faces of a regular tetrahedron? (We define the angle between two intersecting planes as the angle between two intersecting lines, one in each plane, such that each line is perpendicular to the line at

131. ## physics

A positively charged particle of mass 5.20 10-8 kg is traveling due east with a speed of 30 m/s and enters a 0.37-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 4.20 10-3 s, at which time it leaves the field

235. ## Economics

Normally, higher interest rates in a country cause the ___ for that country's currency to increase as money flows to the higher interest rates. This depends on the perceived ___. For the first blank I have "demand", but I'm not sure about the second blank?

236. ## Math

Collision insurance is insurance that safeguards the owner of the vehicle from damages that occur from vandalism, weather, or theft. A. True B. False

237. ## Physics

I am trying to help my step son who missed half of physics class due to a funeral. A laser beam is being shot through two different materials that have been stuck together. if theta 1 = 65.5 and theta 2 = 49.8 what is the index of refraction? (I got 1.2

238. ## abc

Alice, Bob, Candice and David run for school president. There are 201 students in the school and each student can vote for only one candidate. The person with the largest number of votes is the winner. If every student votes, what is the minimum number of

239. ## math

will smeone please help me solve this question. Simplify the expression. Write your answer in the lowest terms ans leave it in factored form. __3y__ + ___4__ y(4y-1) 4y-1

240. ## math

will someone check to see if I have this question correct please. divide and simiplify to lowest terms. __2x^2-8_ divided by __x-4__ 5x-8 5x-8

241. ## christian religious knowledge

repentance is necessary condition for forgiveness to take place. explain this statement with reference to the life of david

242. ## cars

Which one of these statements is true about a "bumper-to-bumper" warranty.

243. ## Precalculus with Trigonometry

Prove or disprove the following Identities: cos(-x) - sin(-x) = cos(x) + sin (x) sin raised to the 4 (theta) - cos raised to the 4 (theta) = sin squared (theta) - cos squared (theta) cos (x+(pi)/(6)) + sin (x - (pi)/(3)) = 0 cos(x+y)cos(x-y) = cos squared

244. ## Math

If There Are 3 Runners On The Track And Runner 1 Has Done 3 1/2 Laps, Runner 2 Has Done 4 3/4 Laps And Runner 3 Has Done 2 1/8 Laps, How Many Laps Have All 3 runners Done Combined?

245. ## health

imagining potential negative big events is one way that a person can manage his or her stress. to help with this, one should

246. ## math

. A clothing store has everything on sale for between 10% and 40% off. This can be represented by the system of inequalities shown below, where y is the amount of discount and x is the cost of the clothing item.

247. ## Math

There Is 3/4 Of Class 218 Going To Art And 1/8 Going To Gym. The Rest Of The Class Is Going To Computer Class. What Fraction Of The Class Is Going To Computers ?

248. ## math

find the value of x in the equation 6x +4(70-x)=300

250. ## Math

Write an expression for 5 and m more

251. ## math

what percent of 6,350 is 1,397?

252. ## Discrete Math

If n is a positive integer and n > 1,prove that (n) + (n-1) is a perfect sq  (2) ( 2 )

253. ## Math

Prove by induction : if n < =(2^k) -1 then we can find the number with k guesses

254. ## chemistry

What is the concentration when 60.0 mL of a 9.00 M HCl solution is diluted to 1.170 liters? and how do you solve this problem?

255. ## algebra word problem

To remodel a bathroom a contractor Charles $25 er hour plus material costs, which amount to$3825. Therefore, the total cost to remodel he bathroom is given by f(x)=25x+3825 where x is the number of hours the contractor works. Find a formula for f^-1(x).

256. ## english

CHANGE TO PASSIVE VOICE;MY SISTER SPEAKS THREE DIFFERENT LANGUAGES QUITE FLUENTLY

x^2-6x+1=(3x+5)/2

258. ## mechanics

A space aircraft is launched staight up.The aircraft motor provide aconstant acceleration for 10 second ,then it stops.the aircraft's altitude 15 second after launch is 2 km.ignore air friction.what is the acceleration and the maximum speed reached in

259. ## english/writing

how can i write this sentence in a different way The Scarlet Letter was one of the first mass-produced books in the United States upon its release in 1850, and it received much praise and criticism for the novels supposed morbidity.

260. ## Math (Combinatorics)

A newly designed international airport is planning to label its gates. Each gate must be assigned a letter from the alphabet from A to M (13 in all), and a number from 1 to 15. To avoid confusion, any two gates must be assigned a different letter, or a

261. ## median and mode

What is the median of this set of numbers 85,48,75,36,55

262. ## math

how do i find the diameter of a circle c=44

263. ## Math- Partial Fractions

Decompose the following into partial fractions after factoring the denominator as much as possible. Please show some work so I can understand how you did it. 1)x^2/((x-1)(x^2+5x+4)) 2)(3x^3-5x^2+12x+4)/(x^4-16) 3)1/(x^2 (x+1)^2 ) 4)(x+1)/((x^2+1)

264. ## English

Any drinks that start with Q? Doing this thing for school where we have 10 topics and 1 of them is drinks and I cant think of a drink that starts with Q. Name things of that topic from A-Z of the alphabet

265. ## Math

All Even Numbers Are To The Right Of Zero On A Numberline. True Or False

266. ## Math

SCR, Short Constructed Response, What Does S.S.S Stand For ?

4-5z=19

268. ## Math

Find the dimensions of a rectangular cover plate if its length is 8 inches longer than its width if its parameter is 60 inches(Hint:P=2L=2W)

269. ## Math

Prove by induction : if n < =(2^k) -1 then we can find the number with k guesses

270. ## Math

Prove by induction : if n < =(2^k) -1 then we can find the number with k guesses

271. ## Discrete Math

If n is a positive integer and n > 1, prove that (n over 2)+ (n-1 over 2) is a perfect square.

272. ## Math

13% of what number is 16.25?

273. ## stats

given n=74 an x=32.find ^p and ^q

274. ## math

5 seamstresses can make shirts in 3 days so how many can 7 make in 10 days??

275. ## Math

Factor the trinomial completely. y to the 3rd power minus 14y to the 2nd power plus 48y

276. ## foundations of algebra

if 950 watts gives a 164 mile radius, how much power is needed to get a 150,000 square mile area?

277. ## Math

The Additive Inverse Of 7 Is -7. True Or False

278. ## law

legal meorandum

279. ## civic education

ways you as an individual can improve your personal relationship between 2 weeks

280. ## Math

Always Line Up Decimal Points When Adding Rational Numbers. True Or False

281. ## art

Which aesthetic judges art on how well it expresses feelings moods and ideas

282. ## Math

3 4/5 = 5*3+4/5. True Or False

283. ## Math Stem and leaf plots

Stem Leaf 2 9 3 6 6 7 8 9 4 4 5 5 7 9 5 1 4 9 6 1 3 5 Between what numbers are most of the points earned? 6

284. ## math

solve and check your answer. Please check this for me to see if I have the right answer. __2__ = __3__ 1-x 1+x x= 1/5

285. ## math 140

7(3x+9)+(x+3)=11

(-8)*7

287. ## math

Roger has three employees who earn $500,$550, and $700, respectively. how much does Roger owe for SUTA and FUTA in the first weeks? Assume a SUTA rate of$5.3% and a FUTA rate(after the company's credit for state unemployment tax) of .8%

288. ## science

Does a rollercoaster have its greatest GPE at the top of the tallest hill or the bottom of the lowest dip?

289. ## algebra (f°g) problem

Find (f°g)(2) when f(x)=5x+9 and g(x)=1/x Thank you!

290. ## science

if aluminum has the density of 2.7g what would the mass be?

291. ## Math Statistical Concepts for Research

what is repeated sampling?

(2x-1)/(x+1)=2X/(X-1)+ (5/X)

X^2-6X+1=(3X+5)/2

294. ## Math

(8/8)-(6/8+1/8)=

4 * (-6)