# Questions Asked onDecember 13, 2010

1. ## Physics

At a rock concert, the sound intensity 1.0 in front of the bank of loudspeakers is 0.10 . A fan is 30 from the loudspeakers. Her eardrums have a diameter of 8.4 .How much energy is transferred to each eardrum in one second?

2. ## Physics

A 1125 kg car carrying four 80 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 17 km/h. The car now stops,

3. ## physics

1.) A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed 2.5 cm in bringing

4. ## Trig

How do you convert rectangular equations into polar equations? If x4−y4=xy , then r2=atan(b); What is a? What is b?

5. ## geometry

if triangle FGH~ to Triangle PQR, FG = 6, PQ = 10 and the perimeter of trinagle PQR is 35 find the perimeter of triangle FGH

6. ## math 11

i dontget how the textbook got the answer, h = -30cos[(1.43)x]° + 40 the question is: a paintball is shot at a wheel of radius 40 cm. the paintball leaves a cricuarmark 10 cm from the outer edge of the wheel. As the wheel rolls, the mark moves in a

7. ## calculus

Find the point P in the first quadrant on the curve y=x^-2 such that a rectangle with sides on the coordinate axes and a vertex at P has the smallest possible perimeter.

8. ## physics

a popgun uses a spring for which k = 20 N/cm. when cocked, the spring is compressed 3.0 cm. how high can the gun shoot a 5.0-g projectile

9. ## Physics

A 16kg child on roller skates rolls 2m down an incline at 20 degrees with the horizontal. With no friction, what is the total kinetic energy of the child at the bottom of the incline?

10. ## chem

Excess fluorine, F2(g), reacts at 150°C with bromine, Br2(g), to give a compound BrFn. If 423 mL Br2(g) at 150°C and 748 mmHg produced 4.20 g BrFn, what is n? Predict the shape of this molecule using the VSEPR model.

11. ## prob. statistics

a survey indicates that 41% of women in the us consider reading as their favorite leisure time activity. you randomly select 4 women and ask them if reading is their favorite leisure time activity. find the probability that exactly 2 of them said yes

12. ## C Chemisty

What mass of hyudrogen peroxide should result when 1.50 g of barium peroxide is reacted with 25.0 mL of 0.50 M of hydrochloric acid?

13. ## physics

A coin is placed on a vinyl stereo record that is making 78 revolutions per minute on a turntable. Find the magnitude of the acceleration when the coin is placed 5.0, 10, and 17 cm from the center of the record. The radius of Earth is about 6.38x10^3 km. A

14. ## Math

2.) Bonnie is four years older than Clyde. Ten years ago she was twice his age. How old is Bonnie?

15. ## Chemistry

What is the percentage strength (v/v) of Diluted Alcohol, NF, which results from mixing 50 mL of Alcohol, USP (95.0%, v/v) with 50 mL of Purified Water, USP? C1xV1 = C2xV2 95% x 50ml = C2 x 97ml C2 = 49% This was an example my professor put up. I can not

16. ## college

The approximate vapor pressure of CS2 at 30 degrees Celsius?

17. ## 11th grade pre ap physics

An athlete whirls a 7.00 kg hammer tied to the end of a 1.1 m chain in a horizontal circle. The hammer makes one revolution in 0.9 s. What is the tension in the chain?

18. ## physics

a ball mass 800g is dropped from height of 5m and rebounds to a hight of 3.8m the air resistance is negligible. calculate a. the kinetic energy of the ball just before impact b. the initial rebound speed of the ball c. the energy transferred to the ground

19. ## physics

The radius of Earth is about 6.38 103 km. A 7.40 103 N spacecraft travels away from Earth. What is the weight of the spacecraft at the following distances from Earth's surface?

20. ## physics

A hypothetical planet has a radius 2.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? What equation should i use?

21. ## english

In the memoirs, “Barrio Boy” and “No Gumption”, how are these two memoirs similar? How are they different? In what ways are the authors’ choices and depictions related to the subject matter of their stories? pleeeaaaasssseee helpp.

22. ## AP World History

how did the japanese importation of chinese culture differ from that of vietnam and korea? Are these points correct? +++ Japan had a strong religion, Shintoism, while Viet. and Korea did not +++ Japan was the only place not physically connected to the

45. ## physics

A person fishing hooks a 3.0-kg fish on a line that can only sustain a maximum of 35 N of force before breaking. At one point while reeling in the bass, it fights back with a force of 45 N. What is the minimum acceleration with which you must play out the

46. ## Algebra-Did I even begin correctly?

How would I write log(6)27-2log(6)3 as a single logarithm Would I start by getting rid of the (-2)- I know its the same log6 but what would I do with the 27 and the 3 I'm really confused on this one and I have to solve several similar ones with no clue on

47. ## chemistry

The solubility of nickel (II) carbonate at 25 degrees C is 0.047 g/L. Calculate Ksp for nickel (II) carbonate.

how far will 350 j raise a 7 kg mass

49. ## Chemistry

Given 20.0 L of ammonia gas at 5C and 730 torr, calculate the volume at 50C and 800 torr

50. ## physics

A 73 kg man in a 7.0 kg chair tilts back so that all the weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area with a radius of 1.0 cm, and find the pressure exerted on the floor by each leg.

51. ## US History

For decades, America has been locked in hostile confrontation with the two great Communist powers, the Soviet Union and the People's Republic of China. We were engaged with the one at many points and almost totally isolated from the other, but our

52. ## Precalculus

A tower casts a 235-foot-long shadow. If the angle of elevation from the tip of the shadow to the top of the tower is 66.3°, how high is the tower?

53. ## chemistry

An ionic compound has the following composition (by mass): Mg, 10.9%; Cl, 31.8%; O, 57.3%. What is the formula and name of this compound?

54. ## chemistry

Based on molecular mass and boiling point of the five compounds in the table below, which should have the high? est dipole moment: first # molecular mass 2nd: boiling point compound 1 244 203 compound 2 346 255 compound 3 250 138 compound 4 246 146

55. ## physics

A piece of glass has a temperature of 72.0 °C. Liquid that has a temperature of 37.0 °C is poured over the glass, completely covering it, and the temperature at equilibrium is 50.0 °C. The mass of the glass and the liquid is the same. Ignoring the

56. ## math

If the cards contain the following equations, what is the probability that a student will graph a line whose slope is 3? 3y = 9x + 3 x(x + 3) = 0 3x + y = 0 x = 3y x2 + 3 = 0 y - 3x = 0

57. ## statistics

Suppose that a coin is tossed 100 times. Let X be the number of times that it shows heads. Find the mean and standard deviation of X.

58. ## Sociology

What effect do you think the Kent State shootings had on the Anti-Vietnam movement in America?

59. ## CHEMISTRY

how many grams of sodium carbonate are needed to prepare 0.250 L of an 0.100 M aqueous solution of sodium ions? well normally you go moles=grams/molar mass than M= moles/L but when looking for grams? what do you do........multiple .250 by .100 than divide

60. ## chemistry

Consider the hypothetical elements X and Y. Suppose the enthalpy of formation for the compound XY is -336 kJ/mol, the bond energy for X2 is 414 kJ/mol, and the bond energy for Y2 is 159 kJ/mol. Estimate the XY bond energy in units of kJ/mol.

61. ## 10th grade math help

How do you solve? 3-3sinx-2cos^2(x) = 0

62. ## Math Help in need of urgent assistance

A tower casts a 235-foot-long shadow. If the angle of elevation from the tip of the shadow to the top of the tower is 66.3°, how high is the tower? (Round your answer to one decimal place.)

63. ## Algebra

How do I start to solve -2log8(x+1) = -8? I think -2log8(x+1) is log8^(x+1)to the 2nd but then what do I do because then I think I should do log-8/log8 = x+1)^2 but that doesn't work at all Thank you for any help you can give

64. ## science

A surveyor stands on one edge of a ravine. She determines that the ravine w is 140 feet wide. She then determines that the angle of depression from the edge where she is standing to a point on the bottom of the ravine a is 57.5°, as shown in figure below

65. ## physicis

How much power does it takes to do 104 J of work in 8 seconds

66. ## chem

A molecular compound is composed of 58.8% Xe, 7.2% O, and 34.0% F, by mass. If the molecular weight is 223 g/mol, what is the molecular formula? Draw the correct Lewis structure. Predict the molecular geometry using the VSEPR model.

67. ## Precalculus

1. A plane takes off, making an angle of a = 17° with the ground. After the plane travels m = one mile along this flight path, how high (in feet) is it above the ground?. (Round your answer to one decimal place.)

68. ## grammar

Choose the sentence that's written in the passsive voice. A. To Kill a Mockingbird was written by Harper Lee. B. Watch for the turn at the corner of the block. C. Alan and James know how to tell a story. D. The president was trying to develop his country's

69. ## Physics

A 220 kg wooden raft sits on a lake. When a 75 kg man stands on the raft, it sinks 4 cm deeper into the water. When he steps off, the raft vibrates for a while. a) What is the frequency of the raft? b) What is the total energy of the vibration?

70. ## Math

In a twelve-team bowling league, if every team plays every other team four times during the season. How many games must be scheduled?

71. ## AP World history

What were the elements of the tang-Song economic prosperity? i looked in my book but I cannot find enough information. Please and Thank you.

72. ## Math

1). In 1968, vehicle emision standards allowed 6.3 hydrocarbons released per mile driven. By 1980, the standards allowed only 0.41 hydrocarbons per mile driven. What was the rate of change from 1968 to 1980?

73. ## Chemstry

A 5.00 gram mixture of CaO and CaCO3 is heated strongly. After heating, the mixture has a mass of 4.00 grams. What % of the original mixture is CaCO3?

74. ## world history

why did the united states seek to become a world power in the 1890'S?

75. ## Precalculus

A surveyor stands on one edge of a ravine. She determines that the ravine w is 140 feet wide. She then determines that the angle of depression from the edge where she is standing to a point on the bottom of the ravine a is 57.5°, as shown in figure below

76. ## Chemistry

Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO are formed. Compound B is

84. ## maths

How do i rearrange the equation to make d the subject. e = d/ab (d/ab has a square root sign over it)

85. ## algebra

there are people walking their dogs at a park. There are 30 heads and 68 feet at the park. Write out the algebraic equations for this problem. Use P to stand for the number of people and D to stand for the number of dogs.

86. ## chem

A gaseous compound has the following composition by mass: C, 25.0%; H, 2.1%; F, 39.6%; O, 33.3%. Its molecular weight is 48 g/mol

109. ## MATH

FIND THE DIAMETER AND CIRCUMFERENCE OF A CIRCLE THAT HAS A RADIUS OF 1.7 USE 3.14 FOR PI

110. ## english

1. The element of argumentation that deals with the listeners desire to trust and believe in the speaker is called a. ethos b. pathos c. logos d. mythos One element of argumentation involves an appeal to the logical and rational side of human beings. This

111. ## Math

my problem is: From the box containing 5 red balls, 7 blue balls, 10 black balls. you select 4 balls what is the probabilty that EXACTLY 2 balls are black. so i know how to start it c(10,2)c(2,1) ---------- c(22,40 but how do you solve that ?

what is 27×19 in expanded algorithm?

113. ## math

fill in the blanks with the numbers so that the statement is true 2,3,4,7 (_ + _)2 + _ x _ = 53

There are 40 people at a picnic. There are 4 more children than adults. How many of each are there?

115. ## Chemistry

All amino acids (choose the correct choice) a) have the same side chains b) form zwitterions c) have the same isoelectric points d) show hydrophobic tendencies e) are essential amino acids

116. ## physicis

How far will 350 J raise a 7kg mass?

117. ## geometry

How do I figure out the dimensions of each room in a 1200 square foot house with a closet and bathroom the same size, a big family room, and two circular bedrooms?

118. ## Math

3). Sam rows up a river to camp in three hours. The next day he makes the return trip downstream in one hour. If he can row two mph in still water, how fast is the current?(The question was not answered last time).

119. ## CHEMISTY

Determine the molarity of sodium cations in solution when 6.21 g of sodium sulflate are mixed with 2.97 g of sodium nitrate in pure water to produce 350.0 mL of solution.......please explain every step. thanks!

120. ## Math

4). At diving competiotion, Jan's first dive received 9 scores that averaged 9.0. To calculate her final score for the dive, the highest and lowest scores were removed and the average was taken of the remaining seven scores. If her final score was 9.1,

121. ## english- need a creative title!

For my english class i had to right a paper on civil war slang and how this topic releated to the book The Red Badge of Courage. I finished my paper but have no idea of a creative title. Im not good at thinking up good titles :/ have any ideas?

122. ## question about corrections(what they mean)

ok. so this may be hard to explain and may not be enough info that you understand but ill try. I did a paper and my teacher corrected it and said changes i need to make. here is a clip from the paper of something that she commented on: " Here are some

123. ## English - Fools Crow

Hello! Has anyone read the novel Fools Crow by James Welch? I just need your personal opinions on the question: Does the novel also rewrite the dominant history? This is not my homework. I am not a student I am just discussing this book with some people

A space probe is 7.62 x 10 to the 7th power kilometers from the surface of the planet Mars. If the space probe is traveling towards mars at a arate of 127 meters per second, how many hours will it take the probe to reach the surface of the plant? Round to

125. ## geometry

if in a parallelogram ABCD, m angle b=8x-25 an m angle c=7x+55 how do i solve this probblem

126. ## statistics

Suppose you have a data set that is normal and with a mean of 78 and a standard deviation of 9. Within what range would you expect to fine 95% of the data?

127. ## Polynomial

Create a polynomial that describes the perimeter of the outside figure: x + 8, 5, x, x, 2x, x + 8, 34 and inside figure: x + 12.

128. ## Physics

How do you determine the average velocity on a position-time graph?

129. ## science

explain what will happen to butter taken out of the refrigerator and placed in a 38 degrees celsuis room?

130. ## Physics

A rocket moves upward, starting from rest with an acceleration of 35.0 m/s2 for 5.63 s. It runs out of fuel at the end of the 5.63 s but does not stop. How high does it rise above the ground?

131. ## Math

In "the twelve days of christmas", how many gifts in all did "my true love give to me?

132. ## Calculus

Consider the function f defined by f(x)= sin x/x, x cannot equal 0 1, x cannot equal 0 a) At what points does the graph cross the X-axis? b) What is the relation between f(x) and tan x at points x cannot equal 0 at which f(x)=0? c) What is the behavior of

133. ## Chemistry

Which one pair has the larger radius?Explain? a. Calcium atom or calcium ion b. Aluminum ion or Magnesium ion

134. ## math

how would you write 0.316 in expanded form

135. ## Trig

A curve with polar equation r=(8)/7sinx + 36cosx represents a line. This line has a Cartesian equation of the form y=mx+b ,where m and b are constants. Give the formula for y in terms of x . For example, if the line had equation y=2x+3 then the answer

136. ## psychology

What comparisons can you make between psychoanalytical models and functionalism? Select one topic from each and tell why you don't support it. Select one topic from each and explain why you do support it.

137. ## Chemistry-Confused by titration!!

If a 28 mLs of a 0.25 molar NaOH solution is used to titrate 14 mLs of a nitric acid to its phenolphthalein endpoint, what is the molar concentration of the acid?

138. ## computers

What ideas can you propose for the future of processor design? What do you think the limit of clock speed for a processor will be? How could a CPU communicate more quickly with memory? What could future cache designs look like? I've been looking in Google

139. ## Physics

A person places the speakers 4.0 m apart and connects a signal generator to both speakers that produces a single and consistent tone. (constant wavelength and frequency) He then walks to a point that is 2.0 m from one speaker and 2.3 m from the other. At

140. ## math

Find sin(θ), cos(θ), tan(θ). Assume a = 40, b = 9, and c = 41.

20xsquared+40 x+15=0

217. ## english

In this sentence, I think i need a comma after asking, right? When the communication was poorly understood,the nurse clarified the female patient's meaning by asking “I am not sure that I understand what you mean by 'depressed than usual’?"

218. ## Precalculus

Solve the triangle ABC under the given conditions. a = 19, b = 8.2, c = 12 A= B= C=

219. ## math

The volume of a ball is 288 pi cm^3. Find the dimensions of a rectangular box that is just large enough to hold the ball. use 3.14 for pie

220. ## social studies

Why were their beliefs different?

221. ## math

Subtract. x+4x-1/3x - 2x+2/3x

222. ## physics

- a 40 kf milk crate is placed on a 20◦ ramp. determine the force normal of the mil crate on the ramp.

223. ## algebra

Multiply. 2x-1/3x * x+1/2x

224. ## algebra

Simplify. x^2+3x+2/x^2-2x-3

Find sin(θ), cos(θ), tan(θ). Assume a = 40, b = 9, and c = 41. (Do not use mixed numbers in your answers.)

226. ## s.s

what are the geography bee questions and answers of 2010

227. ## Spanish III for Whitney

I have a suggestion for you on the last post of Dec. 9. http://www.jiskha.com/display.cgi?id=1291947185 Sra

for a science project what questions can you ask about things that has to do with scientific process and how to solve it through forming hypothesis and give evidence about it like a question about population or something..

Correct the sentences 1. Will you make cards for Valentines Day? 2. The teacher read Charlottes Web to the class in April. Thank you.

230. ## science

I am SOOOO stuck on this science question!! It's not that hard but, science isn't my forte..... here it is...." If the mass of the brick is 50 grams and it's volume is 9cm cubed, calculate the density of the block using the formula D = m/v." HELP

Why did people consider Nerfertiti a goddess?

232. ## calculus

A ceiling in a new home rises 8 feet over a distance of 29 feet. Find the slope of this ceiling. Round your answer to two decimal places

234. ## calculus

what is the gradient of 2y-3x=21

235. ## Math

i have to write this out in word form because it doesn't look rite when i use numbers... What is the value of X when Y=7? Problem: negative threeX to the 2nd power plus fourY minus one equals zero 2 -3x + 4y - 1 = 0

236. ## geometry

if x, x+3 and y are the lenghts of the sides of a triangle then _

237. ## marketing

7) The marketing mix

238. ## math

what is the answer to this systems of equation using elimination 2x+3y=11 and 3x+3y=18

239. ## math

Solve for y: 12+11=-32y

240. ## Geometry

Given triangleABC is congruent to triangleXYZ, if AB=3X-1, BC=5X+2, XY=7, and YZ=14, find X.

241. ## physics

the rate at which position changes with time is called acceleration. true or false?

242. ## Physics

What factors affect the period of a pendulum?

243. ## Physics

How do the initial and final horizontal velocities of a projectile compare?

3/8+y=-3/16

245. ## college maths

subtract. 10 3/5-2 10/11= 8 38/55 7 743/55 7 38/55 Is D correct??

246. ## child care

thanks bobpursley ok 6 is not b so i think is a? and 20 if its 25-30% its b?

248. ## math

Multiply. 3x-3/2x-2 * 4x/3

249. ## algebra

Solve. 2x-1/x=4

250. ## social studies

Why were the Europeans beliefs different

251. ## social studies

could someone tell me about an intresting place to visit in washington d.c. that starts with a c-z

252. ## chemistry

give the name and formulas of the compounds that rust is composed of

253. ## COLLEAGE ALEGEBRA

QUES # 1 a STARTUP COMPUTER CAN SELL 1000 COMPUTERS IF THEY PRICE THEM AT $500. tHE NUMBER SOLD WILL INCREASE BY 10 FOR EVERY$1 decrease in the price. The company has fixed costs of $100,999, and each computer costs$300 to produce, Find the price that

254. ## English

1. The food is thought to be made from eggs. (Is this sentence grammatical?)

255. ## Calculus II

Suppose that y = f (t) satisﬁes the diﬀerential equation dy/dt=y(2−y) and initial condition f (0) = 1. Find an explicit expression for f (t).

256. ## science

what are the global winds that effect north america?

257. ## Social studies

What are The five basic terms associated with gender and sexuality are?

258. ## Algebra II

How would I write log(6)27-2log(6)3 as a single logarithm I'm confused on this one Thanks for any help you can provide

259. ## Physics

A person places the speakers 4.0 m apart and connects a signal generator to both speakers that produces a single and consistent tone. (constant wavelength and frequency) He then walks to a point that is 2.0 m from one speaker and 2.3 m from the other. At

260. ## social studies/writing

could someone give me information on the top 20 washington d.c landmarks.please.

261. ## social studies

i need info on iran's nuclear program asap so can u tell me were to get it

263. ## maths

L =4 piesign Cx(x is below the line, solar constant) d squared Make d the subject

264. ## college maths

Simplify 5+1/3 1/3 1/3 {1/9+1/9} 4 1787/2187 4 1792/2187 4 1784/2187 4 22/27 Is D the best choice not sre for this one

40/n = 28/22 what is n?

266. ## Precalculus

Find sin(θ), cos(θ), tan(θ). Assume a = 40, b = 9, and c = 41.

9z=8

268. ## math

If a television produces a 8ms response time, and there are 1000 ms in one second, how many frames would lag per second is there in a 60 frames per second video game?

269. ## Math

How do you write a quotient that gives the same answer as 4.65\ 0.12?

270. ## social studies

how did native americans use the land and other mined resources?

271. ## Areas of squares and rectangles

a square with a side of 27 miles

272. ## english

where can i find some reason to support this opinion "high schools should not only prepare students for college, they also need to help them prepare future possibilities."

273. ## Algebra 2

How do I find the inverse of a linear relation represented by the points (2,4) (6,8) (-3,9) (-7,-8)?

274. ## l.a

flowers for algernon trail play what are some questions to ask if you are the prosecution in the play to the doctors who did the operashun on Charlie in the story

275. ## English

Alright I'm writing an MLA Essay about Through The Looking-Glass, a sequel to Alice's Adventures in Wonderland by Lewis Carrol. I'm basically writing about how it is indeed a sequel to the first book and comparing the two. I'm not sure how to start it and

276. ## math

were less than 50 lunches eaten in aweek? is the ans an estimate or exact?

277. ## science

the temperture in which all motion of particles stop

278. ## Science

what creates the circulation of air or water that forms from uneven heating?

279. ## English

Thank you very much for your corrections. Here are some more sentences for you to check. 1) Queen Victoria ascended the throne in 1837 and reigned constitutionally until she died in 1901. She never overruled (synonym?) Parliament and was beloved (synonym?)

280. ## geo (finals)

please help! i don't get these problems at all! a(4,3) b(7,4) and c(5,2) are midpoints of a triangle. find the coordinates for the vertices of the triangle!

281. ## algebra

10-d=19 What is d? I think it is -9.

Which acid,if it reacts in tincture of NaOH forms sodium hypochlorite?

283. ## math

16g of mix for each litre of water so how many grams in 100ml

284. ## art

there are 6 hues called ____ hues what are they and how are they made?

285. ## english

do we need a comma after "me" and capitalize "Now" She also said to me "now I have trouble with understanding the importance of following my nutritional diet?"

286. ## French

En quoi se distingue l’anthropologie comme métier de l’anthropologie pratiquée comme une science ? What does this mean?

6x-2x+8=x+5

288. ## History

What was "the late war" ? (My teacher said it's not Vietnam....) Thank you

289. ## algebra

(y-4)-(y-9)=5y

290. ## Social Studies

Do mountains run through the majority of North Korea?

291. ## math

What are deriviatives

292. ## Math

please show how you would divide 35.6728 by 5.246

293. ## chemistry

give the name and formulas of the compounds that rust is composed of

294. ## math

how would one divide the following, with full steps shown: 1+1/√3 ÷ 1-1/√3

295. ## math

1/2x+1/3y=5 1/4x+1/3y=4 elimination method

how old was Anne when she died

297. ## college algebra II

using the quadratic equation solve: y^2+16+64=0