# Questions Asked onFebruary 12, 2011

1. ## Chemistry

For Mn3+, write an equation that shows how the cation acts as an acid.

2. ## chemistry

When N2O5 (g) is heated it dissociates into N2O3 (g) and O2 (g) according to the following reaction: N2O5 (g) N2O3 (g) + O2 (g) Kc=7.75 at a given temperature. The N2O3 (g) dissociates to give N2O (g) and O2 (g) according the following reaction: N2O3 (g)

3. ## Science

Helium gas in a balloon occupies 2.5 L at 300.0 K. The balloon is dipped into liquid nitrogen that is at a temperature of 80.0 k. What will the volume of the helium in the balloon at the lower temperature be? I got a weird answer like .66667 and i used

4. ## Chemistry

what is the pH of 0.316 M KC6H5O? what is the pH of 0.245 M CH3NH3I?

5. ## geometry

A road climbs at an 8 degree angle with the horizontal. What is the grade of the road?

6. ## math

How many ways can a person select four books, two CDs, and one DVD from ten books, twenty CDs, and five DVDs?

7. ## chemistry

How many of the following are true concerning balanced chemical equations? I. The number of molecules is conserved. II. The coefficients for the reactants tell you how much of each reactant you are given. III. Atoms are neither created nor destroyed. IV.

8. ## chem

what is the molality of a solution of 50.0 grams of propanol in 152 mL water if the density of wate is 1.0 g/mL and the density of the solution is 0.78 g/mL

9. ## Chemistry

the air in a steel belted tire is at a gauge pressure of 29.8 psi at a temperature of 20 degrees celsius. After the tire is driven out fast on a hot road, the temperature in the tire is 48 degrees celsius. What is the tires new gauge pressure. Can someone

10. ## math

when no more than 110 units are produced, the cost of producing x units is given by C(x)=.2x^3 - 25x^2 + 1531x + 25,000 How many units should be produced in order to have the lowest possible average cost?

11. ## Calculus - dimensions of a box?

A rectangular box with a square bottom and a volume of 256 cubic feet is to be constructed. The top and bottom cost \$ .10 per square foot to make and the four sides cost \$ .05 per square foot to make. Find the approximate dimensions of the box which would

12. ## algebra

Patty is only 7 years old, but she insists she can play basketball with a regulation-height hoop. She can throw the ball with an initial velocity of 11 feet per second. The equation for the height of the ball is y = −16t2 + vt + s where v is the initial

13. ## physcial science

How to solve for Jane (mass 40 kg),standing on slippery ice, catches her leaping dog (mass 15 kg) moving horizontally at 3 m/s. What is the speed of Jane and her dog after the catch?

14. ## Math

If the following amounts of lumber need to be delivered to 2 different staging areas at 4 different job sites, how many total boards of each size will you need? 1.65:2x4s 2.45:2x8s 3.25:2x10s How to work this problem.

15. ## Algerbra

f(x)=-4x-3 Find the slope and y-intercept

16. ## HISTORY

I have to write an essay, but I need someone to make an outline so it is easier. (DO NOT write my essay. I just need an outline. Thanks!) Here is the assignment: •Use Roman numerals (I, II, III, IV, V) to represent the introduction, conclusion, and main

17. ## physics-mechanics

A high-speed test track for cars has a curved section — an arc of a circle of radius R = 1440 m. The curved section is banked at angle a = 19.1 degrees from the horizontal to help the cars to stay in the road while moving at high speeds. The acceleration

18. ## algebra

Tom and Jerry were offered similar jobs at competing companies. Sony offered Tom a starting salary of \$32,000 per year with a 7% raise at the end of each year. Panasonic offered Jerry a \$35,000 annual starting salary with a 5% raise at the end of each

19. ## algebra

The length of a rectangular piece of property is 1 foot more that twice the width if the perimeter is 302 feet, find the length and width

20. ## English

If I'm writing about the Thirteen Colonies in my paper. Does Thirteen Colonies need to be capitalized. example The Learner will develop a understanding of the three different regions in the thirteen colonies.

21. ## physics

A cannon shell is fired up in the air at an initial speed of 225m/s. After how much timeis the shell at a height of 6.20 X 102 and heading down. What equation would be used to solve this?

22. ## US History

What factor made Germany’s blitzkrieg so different from the tactics used in World War I?

23. ## AP PHYSICS MECH.

A 5.00 g bullet moving at 648 m/s strikes a 670 g wooden block at rest on a frictionless surface. The bullet emerges, traveling in the same direction with its speed reduced to 440 m/s. A 5.00 g bullet moving at 648 m/s strikes a 670 g wooden block at rest

24. ## chemistry

Glycerin, C3H8O3, is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 164 g of glycerin to 325 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

25. ## Math

Emma has decided to sign up for a new e-mail account. The program requires her to choose a password for the account that is first a letter, second a number digit, and finally a letter again (can be the same letter as the first entry). She has 26 letters

26. ## physics

When some volcanoes erupt, big rocks have been measured to shoot upward with speeds of about 1000 m/s. Show that, neglecting air resistance, these rocks reach heights exceeding 50km.

27. ## physics

Carmelita tosses a baseball straight up into the air and it returns to her glove in 3.0s. Show that she has to give the ball a vertical speed of 14.7 m/s if it is to return to her glove in that time.

28. ## algebra

solve for t C=ts, t=

29. ## fractions

If I have three pizzas all the same size and one pizza is cut into halves, one is cut into fourths, and one is cut into sixths. All together I have twelve pieces of pizza. If I eat four did I eat 4/12 of the pizza?

30. ## Physics

Two point charges are placed on the x axis. The charge +4q is at x=3.00 m, and the -q charge is at x=-3.00. a) There is a point on the x axis between the two charges where the electric potential is zero. Where is this point? Found it to be: -1.80m b) The

31. ## University Physics

Determine an equation for the total force needed to drag a box at constant speed across a surface with coefficient of kinetic friction uk when the force is applied at an angle theta.

32. ## chem

vapor enthalpy energies kj/mol 40.66, specific heat capacities j/g degrees c s(s) 2.1, fus 6.01 enthalpy energies kj/mol 6.01 specifi heat j/g degrees c s(1) 4.2, s(g) 2.0 how much energy is needed to convert 64.0 grams of ice at 0.00 degress c to water at

33. ## science

if you place a dime penny and quarter on a spinning turntable which coin has a greater speed than the penny than the penny

34. ## Calculus - not sure if my work is correct?

A 15ft ladder leans against a building and its base starts to slide down the wall. The base is moving at a rate of 5ft/sec when the base is 9ft from the wall. How fast is the top of the ladder moving at this moment? What is the rate of change of the angle

35. ## English

On Sunday Morning while church bells rang in the village along shore the world and its mistress returned to Gastby's house and twinkled hilariously on his lawn. What figure of speech is this?

36. ## physics

a device has a 100g wooden shuttle that is pulled along a square woooden rail by an elastic band. the shuttle is released when the elastic band has 9.0 N tension at a 45 degree angle. what is the magnitude of the initial acceleration of the shuttle?

I posted this 2 times already, and this is my third time posting. For each of examples identify financial decision you have made or might have to make in the future. In the last column, tell what effect this decision may have on ur personal resources.

38. ## chemistry

A solution is prepared with an unknown compound with an empirical formula of C3H7NO. The solution is made by dissolving 30.0 mg of compound in 1.200 g of the organic solvent biphenyl. The freezing point was depressed by 1.37C. What are the molar mass and

39. ## physics

A motorboat accelerates from rest in a straight line at a constant 2.0 m/s2 for a time of 8.0s. Show that it travels 64m in this time.

40. ## Calculus BC

Find the volume if the region enclosing y=2x, y=0, x=3 is rotated a)about the y-axis b)about the line x=3 c)about the line x=4.

41. ## physics

Zephram is on roller blades on a hill. He starts from rest and skates for 5.5s accelerating uniformly at 3.5m/s2. Show that the distance traveled is 53m.

42. ## British Literature

Is the following statement a malapropism? "Your reason,dear venom, give thy reason".

43. ## Physics

You are an artillery offcer attached to Gaius Julius Caesar's Xth Legion in the Gallic War (1st C. BCE). You are responsible for a catapult, a device with a long spoonlike arm used to lob stones or pumpkins over the walls of Gallic oppida. These fortresses

44. ## algebra

use multiplying by 1 to find an expression, equivalent to 2/9 with a denominator of 18y

45. ## Physics

I fire a tennis ball from an air cannon, straight up from ground level, at initial speed v0. At the instant it reaches the top of its trajectory, I fire a second tennis ball at the same initial speed. Air resistance is negligible. At what fraction of the

46. ## calculus

Find the discontinuities of the given function. Classify them as a point discontinuity or a jump discontunuity. g(x)= x, x= -3

47. ## calculus

Find the domain and range of the given functions. 1. h(x)= (squareroot4x+1)+3x-5 2. f(x)=3cos(x/3)-1 3. g(x)= log (x+2) Can someone show me the steps to figure the above problems?

48. ## Sciencies

Different science process and their meaning and examples please help me because i don't have my book yet thank

49. ## chemistry

calculate the volume of amonia that is produced at stp when 10.5 grams of N2 reacted with excess H2.

50. ## chemistry

total mass 9.85 grms and total volume 0.65 cm ^3 . The jewlry contain only gold and silver which has densities 19.3 g/cm^3 amd 10.5 g/cm^3.calculate the % of mass of gold in jewellery

51. ## Math

Frank has a 65% chance of receiving an A grade in geology, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in geology or mathematics (or both). Find the probability that he receives A grades in both geology and

52. ## geometry

Jim is 4 ft from a lamppost that is 16 ft tall and he is 6 ft tall. His shadow is __?__ ft long

53. ## physics

A ball is thrown vertically upward at 14.7 m/s. Show that its maximum height will be 11m.

54. ## physics

A ball tossed upward reaches a maximum height of 3.0m. Show that its initial speed was 7.7m/s.

55. ## Physics

Picture the following: A square with 4 point charges. Charges Q are diagonal from eachother, and charges -Q are diagonal from eachother. The length of each side is "a". One of the -Q charges is "kicked" away with an outward initial speed of V0, while the

56. ## science

. A parachutist jumps from a plane at 8000 ft altitude with a 24-ft diameter chute. Total weight of the jumper and the chute is 185 lbs. Determine the time to fall from 8000 ft to 5000 ft using the average fall velocity between the two elevations.

57. ## native history

explain three ways that the U.S. plagiarized from the iroquois confederacy to make the U.S. government?

58. ## physics

Will tosses a ball straight upward. Show that if the ball is tossed upward at 18m/s it will be in the air for less than 4s.

59. ## Statistics

Heights of males are norm. dist. w/ u=180cm and o^2=16cm^2 while female heights have u=170cm and o^2=25cm^2. a)random male and female selected. What is the probability that the male is >5 cm taller? What is the distribution avg of the 2 heights? b)what is

60. ## science

Max turns the handle on a pencil sharpener. This turns the wheel that turns the blades. The blades sharpen the pencil. In this situation, what is the input force?

61. ## calculus

Evaluate the limits without using a calculator. Justify all steps in the solutions. lim x-->0 x^7cos(3/x)

62. ## calculus differential equation

Find in implicit form the general solution of differential equation dy/dx=2(e^x-e^-x)/y^2(e^x+e^-x)^4 with (y>0). I know this requires a seperation of variables but I beyond that I am confused by how.Thanks.

63. ## Algebra 1

How do you solve this algebraic equation using graphing? y = 3x - 1 y = -x + 1

64. ## physics

A car traveling along a level road uniformly increases its speed from rest to 28m/s in 8.0s. Show that it travels a distance of 112m in this time.

65. ## LA

what did the famous poet, carl sandburg believe???? -what did he give?

66. ## algebra

Find the smaller solution for 4x2 − 78 = 2

One morning, 8/9 of the customers at the diner ordered coffee. Regular coffee was ordered three times as much as flavored coffee. What fractional part of the customers orderd flavored coffee? I did it this way 8/9x3/1= 24/9=8/3 I got 2 2/3 It is wrong so

68. ## Physics

The head of a golf club exerts a force of 350N on a golf ball for 0.3m. The golf ball has a mass of 85g. What speed should the golf ball have when it leaves the club head?

69. ## chemistry

these is 0.1M HCl of 100ml of that solution in a beaker,calculate pH?

70. ## Math

What is simplest form of fractions mean

71. ## calculus

Use the function given to answer the following questions. g(x)= 2 x-2/(squareroot x)-2 The first 2 is set in the middle of the division line. I think signifying that you solve the x-2/(squareroot x)-2 first then multiple everything by 2. problem to solve

72. ## Statistics - can someone check me

Frank has a 65% chance of receiving an A grade in geology, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in geology or mathematics (or both). Find the probability that he receives A grades in both geology and

73. ## physics

An egg falls from rest atop a 15-m tall tree. Show that it takes 1.7s for it to hit the ground below.

74. ## Physics-Please check my explanation so far

If I had the old-fashion camera that had a focal length of 35mm(0.035m) and I take a picture of a person 6 feet away, how far does the film need to be from the lens to record a clear image? I know that the equation is 1/f = 1/d(object) + 1/d(image) so

75. ## chemistry

How will you prepare 150.0 ml 2.0 M H2 SO4 using concentrated H2 SO4 acid?

76. ## math trivia!

Take any number ending in 5. (for example 35). Multpily the first part of the number (3) by the next higher number (4) and then add 25 to the end. (to give you 1225) That's what 35 to the power of two is equal to. This works for any number that ends in

77. ## groundwater science

Assume that a gaining stream exists in physical connection with groundwater in an unconfined aquifer. Assume that several contour lines of equal head cross the stream and intercept it. True or False: Since the stream is gaining, the contour lines of equal

78. ## College English

Can someone explain to me the second and third stanzas? She rose to His Requirement By Emily Dickenson She rose to His Requirement, dropt The playthings of her life To take the honorable work Of woman, and of wife. If ought she missed in her new day Of

79. ## Algebra

The length of a rectangle is fixed at 27cm. What widths will make the perimeter greater than 100cm?

80. ## physics

if you throw a ball up in the air at 8m/s how do you find out how long it is in the air?

81. ## Algebra

The function H descibed by H(x)= 2.75 + 71.48 can be used to predict the height, in centimeters, of a woman whose humerous is x cm long. Predict the height of a woman whose humerous is 38 cm long.

82. ## confidentiality in allied health

which one of the following activities is considered part of health care operations

83. ## chemistry

calculate the volume of amonia that is produced at stp when 10.5 grams of N2 reacted with excess H2.

84. ## science

When the electrons are aligned in the magnetic domains of two materials,what occurs- what is it called

85. ## History

Can someone describe the relationship between Japan and the United States in the late 1930s and early 1940s.

86. ## Spanish

28. ¿Vas a estudiar ahora para la clase de español o para ____ de ciencias? a. uno b. el c. la d. una C? or B.. 29. Me duele la cabeza. Creo que ______. a. necesitamos otro dentista b. debo quedarme en la cama c. busco otro médico d. me siento mejor B?

87. ## groundwater science

Hydraulic conductivity of soil fully saturated with water is greater than the K value for the soil fully saturated with tetrachloroethylene (PCE)

88. ## math

Find the midpoint of the line segment having the given endpoints (8,-4) and (-7,9).

89. ## English

I forgot to include the following statements on car accidents. Thank you very much. I chose the name "Mike" as suggested to me by Jiskha. Can you help me check these school rules in case of an evacuation? Thank you. 1) I've never had a car accident myself

90. ## science

Calculate the specific volume of an air-vapour mixture when the temp=30 degree Celsius, water vapour content Mw=0.015 kg/kg, total pressure Pt=90kpa Please any one can help me>

92. ## Physics

At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the

93. ## Algebra

Evaluate x+y/9 for x=51 and y=3

94. ## Physics

If I had the old-fashion camera that had a focal length of 35mm(0.035m) and I take a picture of a person 6 feet away, how far does the film need to be from the lens to record a clear image? Please help-if you could just suggest an equation-that would be

95. ## FINANCE

General Cereal common stock dividends was \$0.79 in 2000 and the last dividend paid was \$1.55 per share in 2010. Dividends are expected to continue growing at the historic rate for the foreseeable future. What is the General Cereal’s current value of a

96. ## engineering physihcs

I need to create an Excel chart showing world oil reserves vs. time, which are both in columns and cannot find how to graph this in excel. thank you.

97. ## science

true or false:: When the electrons are aligned in the magnetic domains of two materials, magnetization can occur.

98. ## science

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard

99. ## math

how do I write the slope of a line containing points (-2,0) (-2,8)

100. ## french

annee 2011, mois 04, jour 25 Depart : annee 2011, mois 04, jour 27 Nombre de personnes : 2 adlts Nombre de chambres : 1 chambre(s) double(s)

101. ## Portland State

Which solutions has more sodium (assuming all Na dissociates in all cases) .50 M NaCl or 5%(w/v) CH3COONa)

102. ## math

Venus begins a new year every 225 days. Earth begins a new year every 365 days. If both planets begin a new year on the same day, how many days will pass befor that happens again.

103. ## A/P

The number of electrons in the outer shell of K+. I think it has 0 electrons in the outer shell since it lose some. Am I correct?

104. ## algebra

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

105. ## Algebra

Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 120 miles per hour. Train A passes a station at 5:10pm. If train B passes the same station at 5:25pm, at what time

106. ## Geography

Name the types o specialized agriculture grown in Canada, and where it's grown? City and province.

107. ## algebra

what percentage 0f 480 is 450 type a decimal

108. ## Valentines Day Help

Im doing a poem, and im stuck on one part. "Flowers that smells like.... I don't know what to put in the blank. I thought of flowers that smell like the crisp air, but I want it to be more valentiney. Really need help

109. ## Immediate accounting

make a journal entry received cash for 1600 frome customer for rent from dec 2009 through mar 2010 I have more room than I need so i rented out the area

110. ## physics

3 objects of mass 1,0kg,1,5kgand 0,5kg respectively,are suspended by means of a thin string .how great is the tension that the string experiences?

111. ## science

Are there articles about guinea pig and hamster speed through a maze?

If I had the old-fashion camera that had a focal length of 35mm(0.035m) and I take a picture of a person 6 m away, how far does the film need to be from the lens to record a clear image? I know that the equation is 1/f = 1/d(object) + 1/d(image) so would I

113. ## For bobpursley

I will email as soon as I can. My email is not working at this moment and I don't know why. My son-in-law is looking into it right now.

114. ## Random Question

Does anyone know of any jobs hiring now???

115. ## 6th grade science project

My 1st science project and we have something to turn in each week from now till the science fair. this week it is the variables. Project from science buddies. I am doing-Ocean Currents: modeling the 'Global Conveyer Belt' in your Kitchen. Am I correct in

116. ## calculus differential equation

Find in implicit form the general solution of differential equation dy/dx=2(e^x-e^-x)/y^2(e^x+e^-x)^4 with (y>0). I know this requires a seperation of variables but I beyond that I am confused by how.Thanks.

117. ## Social St.!!!ASAP!!!!

How do you know if someone is tracking you ??? THE Topic I am researching about is Privacy and Security.

118. ## algebra

not sure how to multiply 5/9 < 1818.5 I came up with 545.625 now rounding up 600.000? doesn't seem correct to me, if possible could anyone tell me where I went wrong.

119. ## Biology

what would you use to get the volume of a an cofee cup?

120. ## literary

what is the first person narattor

121. ## Physics - final velocity?

At sea level, a hydrogen molecule in the air has an average kinetic energy of 5.53×10-21 J. Its mass is 3.32×10-27 kg. The hydrogen molecule shoots straight up without colliding with the molecules in the air. (Assume that you can use g = 9.81 m/s2;

122. ## english

when do you use present perfect?

123. ## Symbolic Logic

1) Give a general proof to show that for all sentences X and Y and for every consistent set Σ of sentences, if X and Y are logical consequences of Σ, then the set {X, Y} is consistent. 2) Let C be a logical consequence of the set {P1, P2, P3} and of the

124. ## Algebra

The equation y=1777x + 27,153 can be used to predict the number of gun deaths in the united states x years after 2000, that is, x=0 corresponds with 2000, x=3 corresponds to 2003, x=5 corresponds to 2005, and so on. Predict the number of gun deaths in 2005

125. ## psychology

I need to formulate a hypothesis about human behavior or characteristics and collect data on this. I need to be able to compare this to a known larger population sample.

126. ## english

what would be the reaction of a reader if the topic sentences in an essay did not coincide with the supporting points?

127. ## health

Is HIPPA a detriment to health facility operation?

128. ## algebra

Johnny drove 215 miles from Boston to New York in 4 hours and 15 minutes. What computation will give Johnny's average speed, in miles per hour?

129. ## algabra

use an associative law to find an equivalent expression 55,(t s) is

131. ## algebra

use an associative law to find an equivalent expression 55,(t s) is

132. ## Spanish

I am working on the challenge of "if . . . then" statements, and after some work feel I am getting it. But when trying to put in objects with them I feel unsure. I am hoping someone can check these: Le presté a mi hermana dinero. Si no hubiera sabido sus

133. ## math

a ceiling in a new house rises 8 feet over a distance of 29 feet. Find the slope of this ceiling. rouns=d to two decimal places

134. ## algebra

Solve the following rational expressions. #1 (4y-3)/8 + (3)/(4y) = (y+3)/2 #2 5/(2x-1) = 1 - (8x-16)/(10x-5)

135. ## science

can you give me a web site on the periodic table. Tgank you

136. ## english

Clauses that modified in d following sentences.(1)this work is good enough.(2)Amina cook really well.

137. ## English

I need to describe a little bunny for my English class. What are some adjectives, figurative language, and descriptive pharses which I could use to describe it? Thank you :)

138. ## English

Can you please help me check these school rules in case of an evacuation? 1) During an evacuation you have to (must?) 2) stay calm 3) queue with the respective openline and closeline 4) go calmly to the nearest emergency door 5)if you need, go down the

139. ## Nursing

How many calories can 1L of TPN contain?

39z-(8z-27)=

141. ## algebra

[6 divided(-2)] divided(-1/4)=

142. ## math

Find the midpoint of the line segment having the given endpoints (8,-4) and (-7,9).

143. ## History

In what ways did our wise forefathers look to the Iroquois League to make the U.S. constitution?

144. ## algebra

factor 5p+15=