# Questions Asked onSeptember 22, 2013

1. ## Spanish

I need to make each statement into a question using the interrogative words. Can someone revise the questions Adónde Cuándo Cuántos De dónde Dónde Por qué Qué Quién ¿ Dónde caminan Paco y Rosa? Paco y Rosa caminan a la biblioteca. ¿ De dónde el

2. ## Science/ Chemistry

When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained. a. Determine the empirical formula of the oxide. So for the empirical Formula I got P_2O_5 now it wants me to Write a balanced equation for

3. ## Math/Piecewise functions

Write a piecewise definition for the tax due T(x) on an income of x dollars When x

4. ## Chemistry

Which of the following metals or nonmetals are expected to displace Mn or Cl (respectively) from MnCl2? 1. Ca should displace Mn. 2. Br should displace Cl. 3. Cu should displace Mn. 4. I should displace Cl.

5. ## Chemistry

Acetylsalicylic acid (C9H8O4) is a monoprotic acid commonly known as "aspirin." A typical aspirin tablet, however, contains only a small amount of the acid. In an experiment to determine its composition, an aspirin tablet was crushed and dissolved in

6. ## Chemistry

A sample of impure magnesium was analyzed by allowing it to react with excess HCl solution: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) After 1.27 g of the impure metal was treated with 0.100 L of 0.768 M HCl, 0.0125 mol HCl remained. Assuming the impurities

7. ## Chemistry

The combustion of ethane (C2H6) produces carbon dioxide and steam: 2C2H6+702 yields 4CO2 +6H2O How many moles of CO2 are produced when 5.30 mol of ethane are burned in an excess of oxygen?

8. ## Physics

If an automobile had a 100%-efficient engine, transferring all of the fuel’s energy to work, would the engine be warm to your touch? Would its exhaust heat the surrounding air? Would it make any noise? Would it vibrate? Would any of its fuel go unused?

9. ## physics

The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.45 rad/s2. It accelerates for 29.5 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 63.7 s after

10. ## Science

A ball is thrown horizontally from the top of a cliff 20m high. If the initial horizontal velocity is 8.0m/s,find how long it takes to reach the horizontal plane at the foot of the cliff.

11. ## Chemistry

In four of the following groups, the three substances are either all strong electrolytes, all weak electrolytes, or all nonelectrolytes. Which group has one member which is NOT like the others in the group? 1. NaCl; Ca(OH)2; HNO3 2. BaCl2; NaNO3; HF 3. O2;

12. ## Physics

A car rounds a curve with a radius of 25 m at a speed 30 m/s. What is the centripetal acceleration of the car?

13. ## physics

In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?

Write an equation and show all work. The sum of three consecutive odd numbers is 111. What is the smallest of the three numbers? (I don't understand the question >.

15. ## Bio/Math

A population of glasswing butterflies exhibits logistic growth. The carrying capacity of the population is 200 butterflies, and rmax, the maximum per capita growth rate, of the population is 0.10 butterflies/(butterflies*month). Calculate the maximum

16. ## Physics

An archer stands a horizontal distance d= 55 m away from a tree sees an apple hanging from the tree at h= 12 m above the ground. The archer chooses an arrow and prepares to shoot. The arrow is initially 1.5 m above the ground. Just as the archer shoots the

17. ## Physics

A person initially at rest throws a ball upward at an angle θ0= 75 ∘ with an initial speed v0=15 m/s . He tries to catch up to the ball by accelerating with a constant acceleration a for a time interval of 1.03 s and then continues to run at a constant

18. ## Chemistry

calculate q , w , and ∆ E for melting 1.00 mol of ice at 0 ◦ C and 1.00 atm pressure

19. ## chemistry

Use Henry's law to determine the molar solubility of helium at a pressure of 1.2atm and 25 ∘C. Express your answer using two significant figures.

20. ## math

Eric is putting together alien toys called zerg and Borges for the display window in a toy store. He has a box of alien body parts that contains 45 heads and 55 feet. Each zerg must have one head and three feet.each Borg must have four heads and two feet.

21. ## Types of Business Writing

Assigment: write a business letter according to the background. Background:Assume that you’ve worked for the last five years as an administrative assistant for the Human Resources Department of Broadworth General Hospital. The Director of Human

22. ## chemistry

what is the name of reaction for 3C2H2--> C6H6?

23. ## physics

A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 4.06 m to the north, d2 = 2.05 m northeast, and d3 = 1.15 m at 30.0° west of south (see the figure). Starting at the same initial point,

24. ## Physics

A plane is flying horizontally at a speed of 290m/s. He drops a package (ignoring air resistance). A)If it take 15s for the package to hit the ground, how high above is the plane? B) How far (horizontally) before the island should Steven drop the package?

25. ## Psychology

Preschoolers do not use private speech to A) communicate with those around them B) decide what to do C) explain events to themselves D) review what they know Is the answer A?

26. ## Fluid Mechanics

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the

27. ## Chemistry

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3 +2HCl yields CaCl2 +H2O +CO2 How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate are combined with 13.0 g

28. ## physics

A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of the same material but of twice the radius,what is the new mean drift velocity (a)v/4(b)v/2(c)2v(d)4v

29. ## physics

Two objects of equal mass are on a turning wheel. Mass 1 is located at the rim of the wheel while mass 2 is located halfway between the rim and the axis of rotation. The wheel is rotating with a non-zero angular acceleration. For each of the following

30. ## math

Dave wants to make a stone walkway. The rectangular walkway is 4 feet wide and 4 feet long. Each 2 foot by 2 foot stone covers an area of 4 square feet. How many stones will Dave need to make his walkway?

31. ## chem

A lead atom has a mass of 3.4⋅10^-22 g. How many lead atoms are in a cube of lead that has a volume of 2.07 cm^3 if the density of lead is 11.3 g/cm^3?

32. ## Chemistry

A vessel containing 39.5 cm3 of helium gas at 25°C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 18.8 cm3 of ethanol, what was the

33. ## physics

A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C

34. ## government

Both Greek and Enlightenment philosophers believed that humans __________.

35. ## Physical Chemistry

Integrate the expression β = 1/V (δV / δT) at constant pressure, assuming that β is independent of temperature. By doing so, obtain an expression for V as a function of T and β at constant P.

36. ## Math

A spherical balloon is being inflated. Estimate the rate at which its surface area is changing with respect to the radius when the radius measures 20 cm.

37. ## Brain Teaser Help

C o m i c the ears wet eyebrows chicken right=right ieieceiie a l u m i n u m pa r tici ple

38. ## Physics

Assume that the maximum aperture of the human eye, D, is approximately 8 mm and the average wavelength of visible light, λ, is 5.5 x 10-4 mm. a. Calculate the diffraction limit of the human eye in visible light. D = 8 mm = 0.008 m λ = 5.5 x 10-4 mm = 5.5

39. ## Chemistry

The half life of U238 is 4.5 x 10^9 yr. A sample of rock of 1.6 g produces 29 dis/sec. Assuming all radioactivity is due to U238 find percent by mass of U 238. I have tried ln(t)/ln(0)= -kt and still cannot get the answer What I get is A) 4.5x10^9

40. ## physical

Water flow along horizanta pipe at cross sectional area 48cm which has a constriction at cross sectional area 12cm at one place if the speed at the water at the constriction point is 4m/s calculate the speep at the wide section

41. ## physics

The half-life of a certain radioactive isotope is 32 hours.What fraction of the sample would remain after 16 hours?(a)0.50(b)0.25(c)0.62(d)0.71

42. ## College physics

If you throw a ball horizontally while standing on a skateboard, you roll backward with a momentum that matches that of the ball. Will you roll backward if you hold onto the ball while going through the motions of throwing it? Explain in terms of momentum

43. ## Physics

A person, standing on a vertical cliff a height h above a lake, wants to jump into the lake but notices a rock just at the surface level with its furthest edge a distance s from the bottom of the cliff. The person realizes that with a running start it will

44. ## chemistry

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?

45. ## Algebra (Work Problem)

Susan's backyard has three faucets: A, B and C. If she turns on all three of them, it takes 380 minutes to fill the pool. If she turns on only A and B, it takes 570 minutes, and if she turns on only B and C, it takes 760 minutes. If she turns on only A and

46. ## Physics

A certain type of ideal gas at pressure p0 is contained in a plugged flask of volume V initially at temperature T1. The environmental pressure remains constant p0. (A) As the flask is heated up to temperature T2, the plug pops out. What is the pressure p2

57. ## Physics

A person is a playing a game that requires throwing an object onto a ledge. The ledge is a distance d and a height d/2 above the release point. You may neglect air resistance. You may use g for the magnitude of the gravitational acceleration (i.e.

58. ## organic chem

name all the isomers for c5h10br2

59. ## Physics

A rifle that has been "sighted in" for a 94.6-meter target. If the muzzle speed of the bullet is v0 = 429 m/s, what are the two possible angles è1 and è2 between the rifle barrel and the horizontal such that the bullet will hit the target? One of these

60. ## PHYSICS

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.20 m/s and angle of 23.0° below the horizontal. It strikes the ground 6.00 s later. (a) If the base of the building is taken to be the origin

121. ## Math

what value of m will make 4x-7y=5 and 9x+my=3 parallel? a car leaves town A at 10:00 a.m. and travels at a constant speed of 40 kph towards a town B. After 30 minutes, a bus leaves town A and travels towards town B at a constant speed of 56 kph. at what

122. ## Math

At a butcher shop, 1 pound of beef and 2 pounds of chicken costs 859 cents. 1 pound of beef and 2 pounds of duck costs 951 cents. What is the total cost of 1 pound of beef, 1 pound of chicken, and 1 pound of duck (in cents)?

123. ## maths

the probabilities of a boy passing English and Mathematics tests are x and y. What is the probability of failing both tests(a)1-(x-y)+xy(b)1-(x+y)-xy(c)1-(x+y)+xy(d)1-(x-y)-xy

124. ## Calculus

Find the limit. lim x→1 x^4-5x^3+7x^2-6x+3 / x-1

125. ## english

Scuttles across the sand, the crab disappeared into the surf. correct way to write the derivative scuttle as sscuttles

126. ## Math

5 times the least of three consecutive odd numbers is 35 more than twice the sum of the greater two. What is the sum of the three consecutive odd numbers?

127. ## ap world history

which region of the world benefited more from the columbian exchange?

128. ## algebra

(35) I need to determine equation of g(x) that results from translating function f(x) = x^2 + 3 and upward 7 units please help me by showing steps thank you

129. ## Chinese

i cant find a site for mandarin lesson, and also a dictionary(mobile). may you suggest some site teaching mandarin. xiexie. :)

130. ## Discrete Mathematics

Determine whether the given argument is valid: If Socrates was a philosopher, then he wasn’t a historian. Socrates was a historian. So Socrates was not a philosopher.

134. ## Math

Nico squared some numbers and got these answers.Determine each number she squared, Explain your reasoning. a)49 (its 7)i know this one 7 X 7=49 b)1225 c)30 d)72 e)169 f)625 please help, it'll mean alot! :)

135. ## english

1. The teacher issued a warning to all (procrastinate) that friday would be the last chance to turn in papers. 2.The principal announced that (commence) would take place on june 16 3.(Scuttle) across the sand, the crab disappeared into the surf. 4.Will

136. ## biology

I need to know how egg whites would react when tested in iodine and Benedict's solution.

137. ## General Chem

So for Chem we have to answer a question asking why graphing is a more accurate method for measuring density than manually calculating the density. I originally thought that manually calculating was better, but my teacher told me that I would have to back

138. ## Biology

Suppose 1.00 ml of blood from a given donor contained 5 X 106 red blood cells and the donor’s hematocrit were 48%. Determine the surface area that the lipids extracted from the plasma membranes of red blood cells obtained from 10.0 ml blood would occupy

139. ## A Curious Question

How much schoolwork must you complete to graduate high school in approximately two years?

140. ## Science: bibliography cards

For science projects, im doing now my bibliography cards. On encyclopedias, can it be internet encyclopedias only? or it has to be a book kind?

141. ## world lit

A comprehensive defense! More effective, perhaps, If I knew its purpose. Come: what is it? Explain it?

142. ## Algebra

5 times the least of three consecutive odd numbers is 35 more than twice the sum of the greater two. What is the sum of the three consecutive odd numbers?

143. ## question

is it better to take physics or chemistry if taking both whats better to take 1st in sophomore year better to take ap statistics or precalculas for becoming an architect

144. ## PHYSICS

In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is approximately 0.542 multiplied by 10-10 m. (The actual value is 0.529 multiplied by 10-10 m.) (a) Find the electric force

145. ## Math

Rod and John ride their bikes in opposite directions. Rod ride 5 miles an hour faster than john. After 2 hours, they are 70 miles apart. How fast is john biking?

146. ## physics

You visit a planet that turns on its axis once every 24 hours. The radius of the planet at its equator is 7.12×106 meters. Calculate your tangential speed, if you were standing on the equator of this planet.

147. ## social studies

which characteristics is geography reflected in the similarities between the Acadians of anova Scotia and the Cajuns of Louisiana ? a) movement b) location c) place d) adaption

148. ## Physics

Your velocity changes from 50 m/s to the left to 10 m/a to the right in 15s, what is your average acceleration?

149. ## science

a car eneters a freeway with a speed of 6.7 m\s and accelerates uniformly for 3.0 I 3.8 min . how fas the car moving after this time?

150. ## Math

In the expression A(x+5)+2(−Bx+2), the coefficient of x is 17 and the constant term is 219. What is the value of A−B?

151. ## Calculus

Give an appropriate answer. Let lim x→6 f(x)=81. Find lim x→6 4^√f(x).

152. ## homework

A ball is rolled down a hill with an initial velocity of 4.2m/s. How did it roll in 11.6s if it accelerates at 2.3m/s2

153. ## maths

factorise ? a(a+b)^2 - 2ab(a+b)

154. ## maths

If four coins are flipped in succession,then the number of possible outcomes is(a)8(b)12(c)16(d)14

155. ## Math

In the expression A(x+5)+2(−Bx+2), the coefficient of x is 17 and the constant term is 219. What is the value of A−B?

156. ## English

Are you supposed to underline publication titles?

157. ## vocab

What is the problem of a short story

159. ## computer science

The part of a presentation allows me to add character data is Frames. B. Animation C. Text Boxes D. Video Areas

if a fish farmer wanted to harvest his fish so that it recovered at the maximum rate, where should the population be maintained? There is a graph number of weeks vs. numbers of fish. and A B C and D marked on the graph. How do I figure it out??

161. ## English

What is a fine point in a story?

162. ## English

Why did Jim often stay on the raft in Huckleberry Finn? Was it because people would catch him as a runaway slave?

163. ## english honors

How do you make a paragraph using allusion in them? it can be on any topic

Your velocity changes from 50 m/s to the left to 10 m/a to the right in 15s, what is your average acceleration?

165. ## Chemistry- is this correct?

34 meters/seconds = _____ mm/hour I know 1 m is 1000 mm and 60 seconds is 1 hour. So I got 2040000. Would the answer in scietnific notation and significant figures be 2.0 x 10^6 mm/hour?

166. ## algebra

(38) please help me figure this out. The multiple choice answers did not match the answer that I got. Select approx values of x that are solutions to f(x)=0 where f(x)=-7x^2 + 5x + 9 please show me steps

167. ## English

What is the meaning of Ethics of Plagiarism?

168. ## understanding child abuse

warning signs for child neglect and abuse

(b=15)/7=14

170. ## Math - Functions

r = -5x^2 + 73x Can someone show me the steps to complete the square for that equation? I don't really understand them.

171. ## math

so 1000 million is a billion and a 1000 billion is a trillion

172. ## Chemistry Graphing

So for Chem we have to answer a question asking why graphing is a more accurate method for measuring density than manually calculating the density. I originally thought that manually calculating was better, but my teacher told me that I would have to back

173. ## 10th grade english honors

i need help making up a story base on any topic using allusion in them

174. ## Math

What is squaring? Also how can you use squaring to estimate and to check answers? reply asap! ty

175. ## Discrete Mathematics

Show that the square of an oddnumber is an odd number using a direct proof.

176. ## Algebra 1

1). 5 - (t + 3) = -1 + 2(t - 3)

177. ## algebra

8x-4>=12or-2/5x>6

-6+3/4s=2

179. ## math

(b+15)/7=14 What is b?

180. ## Math

(24-d)/16=19 WHat is d?