# 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. ## 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.

3. ## Math/Piecewise functions

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

4. ## 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

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

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?

7. ## 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?

8. ## 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

9. ## Chemistry

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

10. ## 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

11. ## 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.

12. ## 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;

13. ## 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

14. ## 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.

15. ## 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

16. ## 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

17. ## 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

18. ## 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?

19. ## 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

20. ## 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

21. ## 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?

22. ## 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?

23. ## 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?

24. ## 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

25. ## 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

26. ## 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

27. ## 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?

28. ## 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

29. ## 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.

30. ## Math

Old McDonald has cows and chickens on his farm. If the animals on his farm have a total of 197 heads and 634 legs, how many cows does Old McDonald have? Note: A cow has 1 head and 4 legs. A chicken has 1 head and 2 legs.

31. ## 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.

32. ## chemistry

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

33. ## 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

34. ## 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

35. ## physics

Two cars, A and B, are traveling in the same direction, although car A is 204 m behind car B. The speed of A is 22.9 m/s, and the speed of B is 18.6 m/s. How much time does it take for A to catch B?

36. ## ap world history

how did wheat impact the Americas?

37. ## Statistics

Find the variance for the set of data: 24, 31, 16, 22,22.

38. ## 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?

39. ## physics

A swimmer can swim in still water at a speed of 9.42 m/s. He intends to swim directly across a river that has a downstream current of 3.04 m/s.

40. ## Math

Steve mcspoke left home on his bike traveling at 18km/hr. Steve's brother set out 2 hours later , following the same route, TRAVELING 54 per hour. How long did brother have to travel to catch up with Steve?

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 >.

42. ## Math

1. Suppose a and b are integers, and the absolute value of a is > than the absolute value of b. Must a be greater than b? Use examples to support your answer. 2. Do decimals have opposites? Explain. 3. For what values of x does the absolute value of x

43. ## 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

44. ## Math

1. the points A (3,5) and B (6,2) are reflected over the y-axis. find the area of the figure formed by joining the points. 2. Liza wants tostart a small business of making souvenir items for sale. the fixed cost is 1200.00. the cost of making each souvenir

45. ## 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

51. ## physics

You plan to throw stones by using a sling of length 1.8 m which you whirl over your head. Suppose you wish to throw a stone a distance of 22 m. What must be the centripetal acceleration of the stone just before its release if it is to reach this distance?

52. ## maths

find the speed of a point on the rim of a 24-cm diameter fly -wheel which is tuning at 2800 revolutions per minute. give your answer in meters per second.

53. ## government

Both Greek and Enlightenment philosophers believed that humans __________.

54. ## Algebra 1

1.) 28 - 0.3 = 0.7 - 12 2.) 3c -4c + 1 = 5c + 2 + 3

55. ## Physics

When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)

56. ## Chemistry

If aqueous hydroﬂuoric acid is reacted with sodium hydroxide, which of the following substances are in the net ionic equation? 1. hydroﬂuoric acid, hydroxide ion, hydronium ion, ﬂuoride ion, and water 2. hydroﬂuoric acid, sodium ion, hydroxide ion,

57. ## ap world history

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

58. ## history/politics

what was the federalist v Democratic-Republicans.. Ie. Alexander Hamilton assumed leadership of Federalist cause and Thomas Jefferson assumed it as Democratic-Republican

59. ## 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)?

60. ## Physics

Two blocks (M1 = 2.57 kg and M2 = 6.71 kg) are in contact on a frictionless, horizontal tabletop. An external force, $\vec{F}$, is applied to block 1, and the two blocks are moving with a constant acceleration of 2.59 m/s2. What is the contact force

61. ## 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?

62. ## Calculus

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

63. ## 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

64. ## English

What are 2 purposes of the exposition of The Most Dangerous Game?

65. ## PHYSICS

Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton

66. ## physics

A .436 kg mass is attached to a spring and executes simple harmonic motion with a period of .19s. The total energy of the system is 4.6 J. find force constant of the spring. Answer in units of N/m

67. ## physics

A daredevil is dead set on jumping the Grand Canyon at its narrowest point (180 meters across). He has set up a ramp at 25 degrees and the ramp's release point is 20 meters above the rim of the canyon. He claims that his bike will be going 40m/s by the

68. ## Math

Two cars run at constant speeds around a one-mile racetrack. If the cars circle the track in the same direction, the faster car passes the slower car every 10 minutes. If the cars circle the track in opposite directions, the cars meet every 30 seconds.

69. ## physics

While taking a rest on a tree branch, a daring cowboy sees a wild horse running towards the tree he was on. he wants to land on the horses back when it passes under the tree. if the horse is running at a constant velocity of about 2 m/s and the vertical

70. ## English

1. He observes keenly, but says little. 2. He watches keenly, but says little. 3. He looks keenly, but says little. 4. He notices keenly, but says little. (Are they all the same? What is the similar sentence to Sentence 1?)

71. ## 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

72. ## Chinese

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

73. ## Chemistry

Provide the products for this reaction: CH3O- +CH3SH -> ????

105. ## math

Some buildings are shown to have 3 blocks between each tower. If the builder continues this pattern how many blocks high will the tower be in building 100?

106. ## Algebra 1

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

107. ## maths

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

124. ## computer science

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

125. ## physics

After a day of testing race cars, you decide to take your own 1570 kg car onto the test track. While moving down the track at 10.0 m/s, you uniformly accelerate to 34.0 m/s in 10 s. What is the average net force that you have applied to the car during the

126. ## physics

An ambulance car is going with a speed of 60 km/h, while a car is trying to go around it in a circle with a speed 50 km/h. If the sound that ambulance car emits has a frequency of 1 kHz, which frequency does the driver of the car hear in Hz when the

127. ## biology

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

128. ## 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

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??

130. ## language arts

What would a flow map look like on the book The Hunger Games?

131. ## 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

132. ## story elements

what is the word for The lesson of a story should start with a T and is 5 letters long

133. ## math

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

134. ## Physics

Show that 90 J of work is needed to increase the speed of a 20-kg cart by 3 m/s. Power = work done time interval= W t

135. ## Physics

Place a small rubber ball on top of a basketball or soccer ball and then drop them together. If vertical alignment nicely remains as they fall to the floor, you’ll see that the small ball bounces unusually high. Can you reconcile this with energy

136. ## 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

137. ## A Curious Question

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

138. ## English

What is a fine point in a story?

139. ## Physiology

How does semiconservative relates to DNA replication?

140. ## English

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

141. ## Math

Can someone help me with this question as in don't give me the answer but help me how to start it! I've been stuck on this question for the past 20 min trying different ways. Thanks In 2010, only 700 mountain gorillas remained in the world. Of these, about

142. ## 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

143. ## 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?

144. ## 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.

145. ## 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

146. ## 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

147. ## physics

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.16 m. The stones are thrown with the same speed of 8.67 m/s. Find the location (above

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148. ## physics

A certain truck can slow at a maximum rate of 4.6 m/s2 in an emergency. When traveling in this truck at a constant speed of 19 m/s the driver spots a large hole in the road 48.2 m in from of his position. The truck continues moving forward at a constant

149. ## Chemistry

Please Explain! I don't understand how the answer is B. Which ionization requires the most energy? A. Na--> Na superscript + plus one electron B. Na superscript + -----> Na superscript 2+ plus one electron C. Mg---> Mg superscript + plus one electron D. Mg

150. ## 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?

151. ## Vocabulary Studies

Imagine that you are standing on the beach in the picture. Write a paragraph of at least 5 complete sentences using imagery to describe your imagined experience. Use at least 3 examples of language that appeals to your 5 senses: taste, touch, hearing,

152. ## english honors

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

153. ## 10th grade english honors

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

154. ## Math

It is a 7-digit number It has a digit 0. The greatest digit is in the hundred thousands place. The value of the digit 1 is 1,000,000. The digit 6 stands for 6,000. The value of the digit 5 is 5 ones. The digit 8 has a value greater than 700 but less than

155. ## math

you have a collection of 13 different toppings and you choose at least one. how many different combination are possible assuming no repeat toppings?

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

157. ## 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?

158. ## 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?

159. ## Math

It is a 6 dagit number. The least digit is in the thousands place. The greatest digit is in the ones place. The digit in the tens place is 5 less than the digit in the ones place. The digit in the hundred thousands place is greater than the digit in the

160. ## 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?

161. ## 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?

162. ## physics

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +2.5 m/s and ax = +5.2 m/s2. The y components of the puck's initial velocity and

163. ## 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

164. ## Calculus

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

165. ## 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

166. ## 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?

167. ## 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

168. ## 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

169. ## world lit

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

170. ## 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

171. ## algebra

a teacher reported 1/5 made A's, 1/4 made B, 1/3 made C's, 1/6 made D's, and 12 made F's How many are in the class Let X = the number of students 57/60 + 12 -------

172. ## Math

Linda has a total of 225 on 3 tests. The sum of the scores on the first and second tests exceeds her third score by 61. Her first test exceeds her second by 6 points. Find Linda's 3 test scores.

173. ## algebra

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

174. ## Math

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

180. ## Chemistry

What is the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Please report your answer in joules.