# Questions Asked onApril 19, 2010

1. ## Algebra

THe function h(t)=-16t^2+v0t+h0 describes the height in feet above the ground h(t) of an object thrown vertically from a height of h0 feet, with an initial velocity of v0 feet per second, if there is no air friction and t is the time in seconds sine the

2. ## Chemistry- Empirical Formula

Aniline, consists of C, H, and N. Combustion of such compounds yields CO2, H2O, and N2. If the combustion of 9.71 mg of aniline yields 6.63 mg H2O and 1.46 mb N2, what is the empirical formula? What is the molecular formula of a compound with the molecular

3. ## physics help

Imagine you are in an open field where two loudspeakers are set up and connected to the same amplifier so that they emit sound waves in phase at 688 Hz. Take the speed of sound in air to be 344 m/s. If you are 3.00m from speaker A directly to your right

4. ## physics

A piano tuner stretches a steel piano wire with a tension of 765 N. The steel wire has a length of 0.400 m and a mass of 3.00 g. What is the frequency f_1 of the string's fundamental mode of vibration? What is the number of the highest harmonic that could

5. ## chemistry

What pH is needed to produce this value of Q if the concentration and pressure values are. Q= 1.38*10^-26 Br2=2.50*10^-4M Br-=12.10M SO4^2-=8.75M Pso2=1.50*10^-5

6. ## Physics

An ice cube having a mass of 50 g and an initial temperature of -20⁰C is place in 400 g of water 30⁰C water. What is the final temperature of the mixture if the effects of the container can be neglected?

7. ## gen chemistry

Which type of bonding does Sr form upon solidification?

8. ## chemistry

When 25.0 g of Zn reacts, how many L of H2 gas are formed at 25 °C and a pressure of 854 mmHg?

9. ## trig

Verify the identity sin 3x cos 3x = 1/2 sin 6x can you show step by step please

10. ## statistics

In a particular hospital, newborn babies were delivered yesterday. Here are their weights (in ounces): 106 104 96 123 116 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at

11. ## English

Identify the correctly punctuated sentence below. Janet entered the abandoned mountain monastery she noticed the moss-covered rocks below. Janet entered the abandoned mountain monastery, she noticed the moss-covered rocks below. Before entering the

12. ## Voltage

If a transformer has 3,000 loops in its primary coil and 1,500 loops in its secondary coil, how do I find the voltage in the secondary coil if the voltage in the primary coil is 120V? Is there a formula? HELP, please!

13. ## PHYS 101

Determine the volume of 200g of carbon tetrachloride,for wich specific gravity is 1.6

14. ## gen chemistry

Which of the following compounds has the highest boiling point? HI H2Te H2O AsH3

15. ## Gen Chem

Barium has a radius of 224 pm and crystallizes in a body-centered cubic structure. What is the edge length of the unit cell?

16. ## Gen chemistry

In liquid propanol, CH3CH2CH2OH which intermolecular forces are present? a)Only dispersion and dipole-dipole forces are present. b)Dispersion, hydrogen bonding and dipole-dipole forces are present. c)Only hydrogen bonding forces are present. d)Only

17. ## Trigonometry

Gabe is spending two weeks on an archaeological dig. He finds a fragment of a circular plate that his leader thinks may be valuable. The arc length of the fragment is about 1/6 the circumference of the original complete plate and measures 1.65 inches. A

18. ## french

Can someone please proofread my paragraph? I already edited it as much as I could. Thanks! Notre classe de français vient d'aller au zoo de San Francisco lundi dernier. Je suis arrivée à l'école à sept heures trente-sept. Quand la cloche a sonné, je

19. ## Organic Chem

Rank these conformational isomers in order of decreasing potential energy? Highest on the left and lowest on the right. To rank items as equivalent, overlap them. Here is a link to the picture of the problem: ht+tp+:/+/bit+.ly/+8ZHeDA Remove the '+' sign

20. ## Gen Chemistry

What is the coordination number of the Fe atom in K3[Fe(C2O4)3]? is it 6?

21. ## chemistry

N2H4 reacts with oxygen to yield nitrogen gas and water . The reaction of 3.80g n2h4 evolves 73.7kj of heat. what's the enthalpy change per mole of hydrazine combusted.

22. ## Chemistry - Balancing Equations

Balance the following: Ca(OH) + H2SO4 -----> CaSO4 + H2O Na2S2O3 + I2 -----> 2NaI + Na2S4O6 ZnCl + Na2S -----> ZnS + NaCl SnCl4 + H2O ----> SiO2 + 4HCl I figured out the 2nd and 4th one to be: 2Na2S2O3 + I2 -----> 2NaI + Na2S4O6 SnCl4 + 2H2O -----> SiO2 +

23. ## physics

Please, anyone help me please. Q: An object is placed 17.8 cm from a first converging lens of focal length 13 cm. A second converging lens with focal length 24 cm is placed 10 cm to the right of the first converging lens. (Take the direction to the right

24. ## PHYS101

oil is added to the right hand arm of a U-tube containing water.The oil floats above the water to a height of h=10cm.The top of the oil+water column is a height d=2cm above the top of the water column in the other arm .Calculate the oil density?

Franca travelled 6.8km from one town to another town. where might have franca travelled?

26. ## phys101

a hydraulic press contains oil of density=800kg/meter cube,and the areas of the large cylinder=0.5meter squad and area of small cylinder=0.0001meter squad.the mass of the large piston is 51kg,while the small piston has unknown mass m.If an additonal mass

27. ## Trig

Virgil sets his boat on a 1000-yard course keeping a constant distance from a rocky outcrop. If Virgil keeps a distance of 200 yards, through what angle does he travel? If Virgil keeps a distance of 500 yards, what fraction of the circumference of a circle

28. ## S.S

Was Kublai Khan esteemed by his subjects?

29. ## Physics

where should an object be placed in front of a concave mirror so that it produces an image at the same location as the object? Is the image real or virtual? Is the image inverted or upright ?

30. ## chemistry

At 1285 degree C the equilibrium constant for the reactin Br2(g) 2Br(g) is Keq= 1.04 * 10^-3. A 0.200 L vessel containing an equilibrium mixture of the gases has 0.245 Br2(g) in it. What is the mass of Br(g) in the vessel? Please help, Thanks!!

32. ## PHYSICS

A circular curve of highway with radius 200m is designed for traffic moving at 100km/h, and is banked so that cars can make the curve even without friction at that speed. What is the correct angle of banking for this curve? Show steps, please.

33. ## chemistry

how would you go about calculating the change in H' of the reaction 2N2O 4NO2+O2 if you are given the H'of formation for N2O and NO2 but not the H' of formation for O2? is H' of O2 zero? if so why? and also how can you tell to use change in S'=sum(npS'p) -

34. ## Chemistry

A popular brand of automobile radiator antifreeze advertises that their product (ethylene glycol; C2H6O2) provides engine protection from temperatures of -64C to 135C when mixed with water in a 50%/50% mix. What is the boiling point elevation and freezing

35. ## algebra

(x^2-25/2x^2+5x-12)/(x^2-3x-10/x^2+9x+20)

36. ## Statistics... I need help

. Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: (Hint: Make a drawing and label first) a. Percentage of scores less than 100 b. Relative

37. ## calculus

A uniform thin sheet of metal is cut in the shape of a semicircle of radius R and lies in the xy plane with its center at the origin and diameter lying along the x axis. Find the position of the Center of Mass using polar coordinates.

38. ## chemistry

According to reference table G,which substance forms an unsaturated solution when 80 grams of the substance is dissolved in 100grams of hydrogen 2 oxygen at 10 degrees celsius?

39. ## chemistry

A student weighed out 1.5g of salicylic acid into a flask and then added 4ml of acetic an hydride to react. He also added 5 drops of concentrated sulfuric acid. Density of acetic an hydride is 1.08g/ml and sulfuric acid is 1.85g/ml (sulfuric acid is a

40. ## Asia

During British rule, the Indian textile industry was almost wiped out because

41. ## statistics

A used car dealership has found that the length of time before a major repair is required on the cars it sells is normally distributed with a mean of 10 months and a standard deviation of 3 months. If the dealer wants only 5 percent of the cars to fail

42. ## economics

Given the business situation of Mrs. Acres Homemade Pies (p. 30) and using the economic concepts of supply and demand, explain 1) Discuss what you think will happen to the supply, demand and price of the product in the short-term; 2) Discuss what you think

two numbers are reciprocals of each other and one of them is four times as large as the other. what are the two numbers?

44. ## chemistry

Calculate the energy that must be removed to convert substance X from a gas at 115°C to a solid -50.7°C. Assume X has a molar mass of 75.0 g/mol. Specific heat capacities ΔHvap 20. kJ/mol C(s) 3.0 J/g · °C ΔHfus 5.0 kJ/mol C(l) 2.5 J/g · °C bp

45. ## acc

Case 9-2 Purchase of Assets On October 10, 2005, Mason Engineering Company completed negotiations on a contract for the purchase of new equipment. Under the terms of the agreement, the equipment may be purchased now or Mason may wait until January 10,

46. ## Ions & Atoms-Lab Part 2

For those who haven't seen my previous post; I request you to go and search for it, it says Lab part 1 on it. You will not know what I'm asking about, if you don't read it it. Overall nothing will make sense. Thank you very much for all your help. These

47. ## globel

How did geography both help and hinder Allied advances

48. ## math

solve the initial value problems: 1- dq/dz = 2 + sinz, q(0)=5 2-dy/dx = (x^2 -2)x, y(2)=4 3-dy/dx = 4e^5^x + x, y(0)=4 4- dy/dx 3x + 2, y(3)= 2

49. ## math

Suppose a rectangular box with 3cm height, 2cm width, and 5cm length was resting on a different face. How would this affect its surface area?

50. ## math

least common denominator of (x^5/x^2 6x 9) and (5/x^2 5x 6)

51. ## Math

The function of g += t^2-t represents the total number of games played by t teams in a sports league in which each team plays each of the other teams twice. The Metro League plays a total of 132 games. How many teams are in the league?

52. ## chemistry

what volume of carbon dixoide (CO2) will be produced if 2.90 moles of iron (Fe) is produced

53. ## Algebra

THe function h(t)=-16t^2+v0t+h0 describes the height in feet above the ground h(t) of an object thrown vertically from a height of h0 feet, with an initial velocity of v0 feet per second, if there is no air friction and t is the time in seconds sine the

54. ## physical science

filtration can be used to separate mixutures based on?

55. ## Physics

You have arranged that the magnetic field in a particular region of space is due North with a value of 0.009 T. An electron enters the field traveling to the west with a speed of 0.09 of the speed of light. As a result, the electron experiences a magnetic

56. ## Science

A chemist weighed out 5.16 g of a mixture containing unknown amunts of BaO(s) and CaO(s) and placed the sample in a 1.50-L flask containing CO2(g) at 30.0°C and 750. torr. After the reaction to form BaCO3(s) and CaCO3(s) was completed, the pressure of

57. ## HCA/220

Summarize the process of blood clotting, immune response, allergic reaction, and hormone release and how they interrelate. I know they all seam to have to travel through the blood somehow but I can't put it all together.

58. ## chemistry

how many moles of carbon dioxide will be produced when 2.8 moles of oxygen react (consider the combustion of ethylene: C2H4 + 3 Oxygen2 -->2CO2 +2H2Oxygen

59. ## physics

A person walks 5 meters in the direction 370 degrees north of east. How far from north and how far east had he walked? what is the answer of this question?

60. ## Chem

Is this correct NO2 + H2O ---> NO3 + H2 and is it hazardous

61. ## Algebra

Simplify the expression (x(3/2)^(4/3)(√x)/x)

62. ## chemistry

the solubility of MG(OH)2 is 0.61 g/L What must be the PH of this solution. and thx dr. bob for last question

63. ## College Algebra

I'm supposed to find a polynomial with specified Zeros. This is all the question told me: Degree: 4 Zeros: -2, 0, 2, 4 I know how to do these problems when it's a degree of 3, but not 4.

64. ## american history

How did the Woodfrow Wilson's reform platform during the 1912 campaign differ from that of Theodore Roosevelt?

65. ## chemical

how to obtain the kinetic data for this reaction 2NO3+2H2>2H2O+N2 HOW TO PERFORM THIS REACTION IN LAB.

66. ## earth

how would eath's gravity effect you in space??? At what altitude does the Earth's gravity no longer have an effect on the astronauts or the space shuttle???

67. ## math

write the value of the 7 in each number: 127 473

69. ## English

1.Which sentence below contains a dangling modifier? 1. I threw the newspaper in the waste basket after I read the editorial. After I read the editorial, I threw the paper away. After reading the editorial, I placed the newspaper in the waste basket. After

70. ## math

Evaluate f(x)= 4x^2 - 2 for f(1/2)

71. ## Statistics

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal.

72. ## Calculus

Need an answer to this Calculus Question. I keep getting this type of question wrong. Thanks. Differentiate the Function: y = (3x-1)^2(2-x^4)^2 y =

73. ## Statistics

Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). a. If you have a body temperature of 99.00 °F, what is your

74. ## English

Thank you very much for your last corrections. I forgot to include a few other sentences I’m still not sure of. 1)Queen Victoria’s reign has been one of the most flourishing (?) in Great Britain’s history. She reigned constitutionally and avoided the

76. ## physics

To tighten a bolt, you push with a force of 90 N at the end of a wrench handle that is 0.45 m from the axis of the bolt. (a) What torque are you exerting? Enter a number. 1 N·m (b) If you move your hand inward to be only 0.15 m from the bolt, what force

77. ## math

the perimeter of a triangle is 195mm if the length of the sides are consecutive odd integers. what is the length of each side?

solve 3 gal 3 qt = _____ qt

79. ## English

1. When was Wima born? - She was born in 1940. 2. How many miles was the hospital away from Wilma's home? - It was about 50 miles away from her home. 3. When did Wilma get a bronze medal at the Melbourn Olympics? - She got a bronze medal in 1956. 4. When

80. ## Chemistry

Some polymers are flexible when pulled one way but not another(example:milkbags). Can someone please explain why this happens?

81. ## chemistry

What is plastic #7 used for? How is it related to cancer?

82. ## social studies

What is the difference between high and low pressure systems and what weather does each bring?

19 < - x

84. ## economics

How is the demand curve for an item that is very responsive to price changes likely to be different from that of an item whose demand is not very responsive?

85. ## English

the plot of strange objects by gary crew

You are playing a card game with a full deck of 52 cards. You win if you draw a red card thatk is a multiple of 5. What are your chances of winning on your first draw?

87. ## religion

what are major similarities and differences among the different religious groups like Atheist, Buddhist Baptist, Catholic, Protestant, Methodist, Hindu, Islam, Jehovah's Witnesses, Mormon Sikh Judaism

88. ## english 3

hi how do i like compare and contrast these two realist stories a good man is hard to find by flannery O'Connor and a pair of silk stockings by Kate Chopin

89. ## PHYS101

For a system,the cylinder on the left,at L,has a mass of 600kg and a cross-sectional area of 800centi meter squad.The piston on the right,at S,has cross-sectional area 25centi meter squad abd negligible weight.If the apparatus is filled with

What is the equation for HOCl dissolves in HOH? I don't get it...

91. ## Math

If you ordered two pizzas for dinner Friday. Date ate 3/4 of one pizza, Jenny ate 1/8 of a pizza, Danny ate 1/4 of a pizza, and Mom ate 1/2 of a pizza. What fraction of a pizza was left for a midnight snack?

92. ## English

What is a verb form ending with -ing called? 1. gerund infinitive possessive passive Question 2 A verb form that begins with to is called what? gerund infinitive possessive passive Question 3 Which sentence is in the correct form? She began to sing the

93. ## PHYS101

A VENTURI TUBE IS USED TO MEASURE THE WATER SPEED V IN A PIPE BY COMPARING THE WATER PRESSURE IN THE WIDE AND NARROW SECTIONS(CROSS-SECTIONAL AREAS A, A=A/4).FIND V IF THE DIFFERENCE IN MECURY LEVEL IS h=25mm.(THE DENSITY OF MERCURY IS =13600Kg/meter cube)

94. ## finance

How much would I have to put away annually to accumulate 50,000 in 8 years given an investment of 10% compounding savings?

95. ## Math

Leah liked to balance objects she found around the house using the science kit she got for Christmas. She found that 3 identical apples and a 5-gram weight exactly balanced a 50-gram weight. Leah said she could tell how much each apple weighed by solving

96. ## PHYS101

A VENTURI TUBE IS USED TO MEASURE THE WATER SPEED V IN A PIPE BY COMPARING THE WATER PRESSURE IN THE WIDE AND NARROW SECTIONS(CROSS-SECTIONAL AREAS A, A=A/4).FIND V IF THE DIFFERENCE IN MECURY LEVEL IS h=25mm.(THE DENSITY OF MERCURY IS =13600Kg/meter cube)

97. ## Grammar and Composition

Hi, I'm working on my Learning Log of Vocabulary Words, and there are two words that I can't find sentences for abnegate, and abode Can someone please help me with these? Thank you!

98. ## Math

Solve the pairs of simultaneous equations by the substitution method. 5x-9y=17 3x-8y=5

99. ## phys101

a homeowner wishes to drain her swimming pool by siphoning the water,whose depth is h,into a nearby gully a distance H below it,where H is much larger than h.She uses a pipe of cross-sectional areea a,and the pool has surface area A.How long does it take

100. ## math

Marissa plans to cut a wire that is 5 feet 3 inches long. How long should each of the cut pieces be if she wants 7 equal pieces of wire? Find the twenty-second term of an arithmetic sequence if the first term is 4 and the common difference is 10. Find the

101. ## Chemistry

what mass of acetylene, will be produced from the reaction of 90g of calcium carbide, with water inthe following reaction CaC2+2H2O-C2H2+Ca(OH)2

102. ## Maths

I'm really struggling with word problems right now. Got through 20 just three left. Can someone please give me some pointers or the first few steps? 1. A sum of money is divided between A, B and C in the ratio 1 : 2 : 3. However, before the money is

103. ## apchemistry

How do you seprate a homogenous mixtre of 2 volatile liquids?

104. ## physics

A fisherman's scale stretches 3.5 cm when a 2.1 kg fish hangs from it. What is the spring stiffness constant?

105. ## Chemistry

what is the laboratory procedure for separating two volatile liquids?

106. ## Physics

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.0 ìC?

107. ## Physics

A rod has a charge of -2.0 ìC. How many electrons must be removed so that the charge becomes +3.3 ìC

108. ## social studies

Who was the 30th president?

109. ## Physics

Four identical metal objects each carry different charges. The charges are +1.6, +8.2, -4.8, and -9.4 ìC. These objects are brought simultaneously into contact, so that each touches the others. Then they are separated. What is the final charge on each

110. ## perimeters and area

what is the perimeters of the letters, exp...I,U,J EXPLAIN HOW YOU GET THE PERIMETER OF EACH LETTER....

111. ## Physics

The nucleus of the helium atom contains two protons that are separated by about 3.0 x 10-15 m. Find the magnitude of the electrostatic force that each proton exerts on the other

112. ## art

Write a summary comparing and contrasting the characteristics of Roman and Greek architecture in 200 to 300 words. Provide examples of architecture from both Greek and Roman culture

113. ## Enviromental Science

• Post a 7- to 9-slide (not including title slide or reference slide) PowerPoint® presentation according to the following: List what you think are the best ways to treat each of the following types of solid waste, and explain the benefits of the

(4xy)^-2

115. ## Engineering

ANPR system takes two images of each passing car. each image is 840 pixels wide and 320 pixels high. each pixel is stored in one byte. on average six car pass per minute. if each uncompressed image is sent back to the control centre for processing, what is

116. ## Math

At Shannons birthday Kira ate 3 pieces, Brazdley ate 2,Shauna ate 4, and Sammi ate 3 pieces of pizza. Now 1/4 of the pizza is left. How many pieces was the pizza originally cut into?

117. ## Communications

Good writing costs companies money, and those costs increase significantly if the communication is ineffective. Which of the following pairs would NOT be two additional costs to the company if written communication is poor? A. Computers and software B.

118. ## English

my new answers 1.After I read the editorial, I threw the paper away. 9.He watched the birds drinking coffee on his porch. 11.An engineer designed that racecar with special headlights. 14.With only \$20 in his pocket, the bus for Norfolk seemed the only

119. ## ECONOMICS

I need to evaluate the effects of government trade policy on economic behavior. In addition I have to incorporate real world examples in today's economic situation.

120. ## ap calculus ab

what is the derivative of y=arccos(4x)/3x

121. ## algebra

The costs of doing business for a company can be found by adding fixed costs, such as rent, insurance, and wages, and variable costs, which are the costs to purchase the product you are selling. The portion of the company’s fixed costs allotted to this

122. ## ap calculus ab

what is the derivative of y=arccos(4x)/3x

123. ## Physics

Two golf balls of equal size and mass are released simultaneously from the roof of a building. One of the balls has a smooth surface while the other one has grooves on it. They then hit on a hard and horizontal plane on the floor. Assume that the golf

124. ## Grammar and Composition

behind the park there was a stream in which trout abound. Does this sentence make sense for the word abound?

125. ## physics

A bungee jumper with mass 63.5 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 40.0 s. He finally comes to rest 28.5 m below the level of the bridge. Calculate the spring

126. ## physics

Damped mass spring system oscillates at 205 Hz. The time constant of the system is 6.6s. At t=0 the amplitude of oscillation is 4.7 cm and the energy of the oscillating system is 26J. What is the amplitude of oscillation at t=9.9s? Answer in units of cm

127. ## Math

A company purchased an air conditioning system for \$10200. The shipping charges on the system were \$875, and the setup cost were \$1250. The system is expected to last for five years and has a residual value of \$2000. If you use the straight-line method to

128. ## Kindergarten Math

what is counter? My child has to draw a piece of yarn 3 counters long over the top needle, 4 counters long over the middle neddle and 5 counters long over the bottom needle! But I don't know what a counter is!

If you ordered two pizzas for dinner Friday. Dad ate 3/4 of one pizza, Jenny ate 1/8 of a pizza, Danny ate 1/4 of a pizza, and Mom ate 1/2 of a pizza. What fraction of a pizza was left for a midnight snack?

130. ## life orientation

provide recommendation how to address the human problem?

131. ## math

Mrs Munoz algebra class was collecting money for a party. The class decided that each student should give the same amount of money. They collected a total of \$9.61. If everyone used 5 coins, how many nickels were collected?

132. ## medical records

How does accreditation affect the practical activities of record management in hospitals

133. ## FCCOLLEGE

Rashida has a monthly income of \$200.which sheallocates between two goods meat and potatoes, (a)suppose meat cost\$4 per pound and potatoes cost \$2 per pound.drawv her budget constraint. (b)suppose that her utility function is given by the equation

134. ## Physics Inertia : Merry-go-round

A playground merry-go-round of radius 1.96 m has a moment of inertia 335 kg m2 and is rotating at 12.3 rev/min. A child with mass 43.1 kg jumps on the edge of the merry-go-round. What is the new moment of inertia of the merry-go-round and child, together?

135. ## math

find the volume of spherical cap

136. ## English 2

In Hamlet, I don't understand what the Queen mean when she says “To my sick soul…/ Each toy seems prologue to some great amiss”?

137. ## math

find the volume of spherical cap

138. ## English

Creon declares that anarchists are behind the burial of Polyneices. What dramatic irony lies in the declaration?

139. ## Chemistry

Which of the following has the highest vapor pressure? CCl4 CBr4 CH3CH3 CH3CHBr2

140. ## Physics

An oxygen molecule consists of two oxygen atoms whose total mass is 5.3 x 10^-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.9 x 10^-46 kg*m^2. Estimate, from these data, the

141. ## algebra

The Two Angles Are Complementary. The Sum Of The Measure Of The First Angle And Half The Second Angle Is 81.5 Degrees. Find The Measures Of The Angles

142. ## chemistry

what is the molarity of a 50% by mass solution of NaOH id the density of the solution is 1.05 g/ml

143. ## science

25 ml sample of 0.150 m solution of aqueous trimethylamine is titrated with 0.100 M soultion of hcl. calculate the pH of the solution after 10.0ml,20 ml and 30.0 ml of acid have been added; pkb of (CH3)3 N =4.19?

144. ## geometry

write an expression for the sum of the angle measures in a regular polygan with n sides. then wirte an expression for the measure of each angle in a regular polygan with n sides.

145. ## Chemistry

In lab we conducted a calorimetry experiment with a peanut. We burned a half a peanut and placed it underneath a pop can with 50mL of water inside. One of our questions is why heat transfer to the pop can isn't accounted for when calculating heat generated

146. ## College Physics

A raft is made of wood with a density of 404 kg/m^3. It is 42 cm thick and its square area is 3.0x3.0 m^2. It is floating in seawater (density = 1025 kg/m^3). How many people of 68 kilogram can the raft hold before they start getting their feet wet?

147. ## Physics: How much do you way on another planet

A person weighs 900 N on Earth. What would he weigh on another planet, where the free-fall acceleration is 26.4 m/s2? Answer in units of N.

148. ## Chemistry!!!~!!

A solution of sodium chloride in water has a vapor pressure of 18.5 torr at 25°C. What is the mole fraction of NaCl in this solution? What would be the vapor pressure of this solution at 48°C? The vapor pressure of pure water is 23.8 torr at 25°C and

149. ## gen chemistry

does RbI form an ionic solid?

150. ## math 213

The effect of depreciation can be computed using a formula similar to the formula for compound interest. a. Assume depreciation is the same each month. Write a problem involving depreciation and solve it. b. Develop a general formula for depreciation

151. ## chemistry

A 1.00 L volume of helium gas is cooled from 50.0 degrees celcius to 25.0 degrees celcius. If the pressure remains constant, what is the final volume?

152. ## calculus

Differentiate and do not simplify: Y=x^2 * 3^2x

153. ## Math

What's the difference between sample space and event in a lottery game (where 50 numbers are drawn and you have to guess/pick six numbers?). Can you give examples of both?

154. ## excusion

An exclusion from society is:? 1. an ostracism 2. a philippic 3. a mausoleum 4. a solecism help plz

155. ## Math

What is equal to: ((6a^2-30a) / a-2))((a^2+2a-8) / (2a^3-10a^2))

156. ## calculus

Differentiate and do not simplify: Y=e^-sq.rt.x + e^3 - 2^(3x-1)

157. ## English

Thank you very much for helping me. These are he very last sentences of thed day. 1)These are the reasons why she stands apart even from her elder sister. 2)Their love is not a love at first sight. They will fall in love only later, after an argument in

158. ## geometry

a pie shaped property is 650.00'X488.00'X405.00', what is the amount of acreage? thanks for the help.

159. ## physics

A meter stick, suspended at one end by a 0.348m long light string, is set into oscillation. The acceleration of gravity is 9.8 m/s^2. A)Determine the period of oscillation. Answer in units of s. B)By what percentage does this differ from a 0.848m long

160. ## algebra

- 3x + 7y = 1200 6x + 4y = 3500 what are the x and y values where the two lines intersect

161. ## Physics: Astronauts and space

When out in space in International Space Station (ISS), Astronauts experience weightlessness. The ISS’s orbit is 354 km (that is 3.54 x 105 m) above the surface of the earth.The distance separating the center of the earth from the center of the ISS is

162. ## algebra 2

find all rational roots of the polynomial 6x^3-13x^2-41x-12=0

163. ## water cycle

what does water freezes into?

164. ## physics

A meter stick, suspended at one end by a 0.348m long light string, is set into oscillation. The acceleration of gravity is 9.8 m/s^2. A)Determine the period of oscillation. Answer in units of s. B)By what percentage does this differ from a 0.848m long

165. ## Chmeistry

given the true molar masses of CuSO4 and H2O how could you find the exact formula of the hydraye from your experimental data. Find the Value of X in the Formula CuSO4x XH2O

166. ## physics

A meter stick, suspended at one end by a 0.348m long light string, is set into oscillation. The acceleration of gravity is 9.8 m/s^2. A)Determine the period of oscillation. Answer in units of s. B)By what percentage does this differ from a 0.848m long

167. ## Chemistry

When i try to do this problem by simply using a mole ratio, wiley keeps saying it's wrong, what mistake am i making? If 0.800 mol of liquid CS2 reacts stoichiometrically according to the balanced equation, how many moles of gaseous Cl2 are required? CS2(l)

168. ## chemistry

how many moles of carbon dioxide will be produced when 2.8 moles of oxygen react (consider the combustion of ethylene: C2H4 + 3 Oxygen2 -->2CO2 +2H2Oxygen

169. ## Chemistry

When i try to do this problem by simply using a mole ratio, wiley keeps saying it's wrong, what mistake am i making? If 0.800 mol of liquid CS2 reacts stoichiometrically according to the balanced equation, how many moles of gaseous Cl2 are required? CS2(l)

171. ## Social Studies

What did Thomas Jefferson & Benjamin Franklin say or write to influence the Declaration Of Independence ?

172. ## AED

, outline your list and assess the 10 steps by explaining how they benefit the ELL students.

173. ## Ions & Atoms-Lab Part 1

We did a lab on Ions and Atoms. The purpose was basically to identify the properties of an ion and compare them to atoms. These were the Materials -safety goggles -apron -copper(II) chloride (CuCl2) -3 250-ml beakers -water aluminum foil -scissors

174. ## Economics

In a one-shot game, if your rival advertises and you advertise, he will earn \$7 million and you will earn \$2 million in profits. If neither of you advertise, you will make \$4 million and he will make \$2 million. If you advertise and your rival does not,

175. ## physics

A mass attached to a spring executes simple harmonic motion in a horizontal plane with an amplitude of 1.07 m. At a point 0.4815 m away from the equilibrium, the mass has speed 3.87 m/s. What is the period of oscillation of the mass? Consider equations for

176. ## math/ current ratio

What is the current ratio of \$617,169.00

177. ## Fundamentals of Design

How can you generate each quality of movement and rhythm in a design?

178. ## calculus

solve the initial value problems: 1- dq/dz = 2 + sinz, q(0)=5 2-dy/dx = (x^2 -2)x, y(2)=4 3-dy/dx = 4e^5^x + x, y(0)=4 4- dy/dx 3x + 2, y(3)= 2

179. ## chemistry

Calculate the energy that must be removed to convert substance X from a gas at 115°C to a solid -50.7°C. Assume X has a molar mass of 75.0 g/mol. Specific heat capacities ΔHvap 20. kJ/mol C(s) 3.0 J/g · °C ΔHfus 5.0 kJ/mol C(l) 2.5 J/g · °C bp

180. ## calc

a math professor is thrown off the matthews bridges, height 240ft, by a disgruntled calculus class with an intitial upward velocity of 10ft/s a) assumign the acceleration dude to gravity is -32ft/s^2,find the macimum height of the professor. b) find the

181. ## Pre Algebra

Write an equation to find the value of X if the perimeter of a triangle =36. AC=x-2, BC=x, AB is unknown.

182. ## Accounting 541Accounting Theory and Research

Efficient markets assume that stockholder wealth is affected by the amount and timing of cash flows. Which alternative is more favorable to them: purchasing before year-end or waiting until January? Explain your answer.

183. ## human resources

A process involveds drilling holes that are supposed to be 3 inches deep. If it is known that the quality cost of a hole drilled 2.95 inches deep is \$5.00, what is Taguchi's quality loss function for this process?

184. ## math

4 in the number 427,083

185. ## chemistry

If 5.0g of Sodium Chloride in 250 mL of solution, what is the percent?

186. ## Math

For what values of x does x - 9 = 0?

187. ## chemistry

c2h4(g) + 3O2(g) -> 2 CO2 (g) + 2 H2O (g) What volume of oxygen will react with 18 ml of ehtylene, c2h4, assuming that the gases are present at the same temperature and pressure?

188. ## current ratios

I am comparing grant income 2002,\$617,169.00,2003,\$632,889,00 and 2004 \$1,078,837.00

189. ## Physics

An applied force of 50 N at an angle of 47.5 degrees up of East is applied to a 7.25 kg crate. Find the coefficient of friction if acceleration is 3.0 m/s/s E. a. 0.28 b. 0.42 (I know this one is wrong) c. 0.56 d. 0.35 e. 0.49

190. ## physics

A siren mounted on the roof of a firehouse emits sound at a frequency of 900 Hz. A steady wind is blowing with a speed of 15 m/s. Take the speed of sound in calm air to be 343 m/s. (c) Firefighters are approaching the siren from various directions at 15.0

191. ## Chemistry

what is the % of mass of 50.0g of solute in 45.0g of water?

if a rug's perimeter is 17cm and the area is 13cm, what are the reasurments for the length and width?

193. ## Calculus

If f(x)= 3 + |x-2|, then f'(2) is A. -1 B. 1 C. 2 D. 3 E. nonexistent

194. ## human resources

As a manager, you are in charge of making the staffing decisions to handle this new project. You will have to assess the skills and competencies of your current 20-person team in terms of the demands of the new project. Since none of your current team has

195. ## Economics

Quality Adjusted Life Years evaluates interventions in _____ rather than _____. a. dollars; years b. utility; dollars c. years; dollars d. dollars; utility

196. ## engineering

ANPR system takes two images of each passing car. each image is 840 pixels wide and 320 pixels high. each pixel is stored in one byte. on average six car pass per minute. if each uncompressed image is sent back to the control centre for processing, what is

197. ## Finance

I have a number of questions for a finance assignment that is meant as a review for our final. However my final is being written earlier than the rest of the class so the answers aren't up yet. I was hoping someone could answer two or three of the

198. ## world geography

how did deng's four modernizations program greatly increase china's farm production

199. ## calculus

Determine the equation of the line that is tangent to y=8^x at the point on the curve where x=1/2

200. ## English

I really find it hard to correct these sentences as I'm not a mother-tongue speaker. I've tried to correct some of them myself but I'm still doubtful. Can you please help me check the grammar? Thank you very much in advance. 1.A woman always depended on

13 yd = how many ft

202. ## statisics

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the

Convert to degress 43 25'

204. ## hca270

Approaches to Valuation Part I: Compute the worth of Arcadia Hospital in 2005 using rules of thumb, adjusted book value, and discounted cash flow valuation (for this final method, use the table provided). Assume the cash flow for 2005 is the same as 2006.

solve: sec(1/4)X+"Square Root of 2"=0

206. ## chemistry

if you have a reaction with an acid dissociation, where one HA goes to H + A how can the entropy be negative? I thought that one mole going to two moles would have positive entropy because of the greater disorder.

207. ## Math

If a rectangular box has A width of 2cm, a length of 3cm, and a height of 5cm, what is the surface area? Is it 62cm2?

208. ## global

How did geography both help and hinder Allied advances?

209. ## computers

True or False The SDLC is NOT used in support of project management to plan, ececute, and control systems development projects.

210. ## space

Will a lightbulb pop in space?

211. ## math-probability

A student claims that if a fair coin is tossed and comes up heads 5 times in a row, then, according to the law of averages, the probability of tails on the next toss is greater than the probability of heads. What is your reply?

212. ## math

One card is selected at random from an ordinary set of 52 cards. Find the probability of each of the following events: b. A spade and a 5 are drawn. d. A jack is not drawn

213. ## chemistry

A student performs a back-titration to determine the cost -effectiveness of an antacid. A tablet with a retail cost of \$0.053 is dissolved in 25.00 ml of 1.000 M HCl, then back-titrated with 1.000 M NaOH. Exactly 14.82 ml of NaOH solution is required to

214. ## Grammar and Composition

Word: abreast Meaning: side by side Sentence: They walked two abreast down the street Synonym: in alignment Part of Speech: Is it an adverb or an adjective?

215. ## Derivatives- Math

Can someone explain how to find the derivative of : 1. y= 5^ãx / x And the second derivative of: y= xe^10x For this question I got up to the first derivative and got this y = e^10x + 10xe^10x but I can't seem to get the correct answer for the second

216. ## history

Why does James Fraser claim that there was great diversity in the progressive education movements? Summarize, and compare and contrast, the platforms of four different progressive educational reform groups. Which group do you believe had the best ideas?

217. ## Geography

I was wondering if a plane flew west and kept flying, would it be possible for it to never fly into night if it didn't stop?

What is the correct punctuation in the following sentences. Do I need quotation marks? Sarah: I am going to the game tomorrow. Mary: Okay. Do you want to ride with me?

219. ## chemistry

when water is added to solid calcium carbide, CaC2, acetylene gas,C2H2,and calcium hydroxide,Ca(OH)2, are produced. how do i write a balanced equation for the reaction.

220. ## chem

when water is added to solid calcium carbide, CaC2, acetylene gas,C2H2,and calcium hydroxide,Ca(OH)2, are produced. how many moles of acetylene are produced when 0.50 mole of calcium carbide reacts?

221. ## chem

when water is added to solid calcium carbide, CaC2, acetylene gas,C2H2,and calcium hydroxide,Ca(OH)2, are produced. how many moles of calcium carbide are needed to completeley react with 5.00 * 10^22 water molecules?

222. ## english

what group have responseblity for the weather forcast

223. ## Grammar

Identify each intensifier and the word it modifies. 1. I am somewhat unclear about the details. SOMEWHAT AND UNLCEAR 2. Jorge's score on that test was nearly perfect. NEARLY AND PERFECT 3. Although I was quite nervous, I apeared calm and collected. QUITE

i need an interesting topic for a tenth grade informative essay

225. ## chemistry

what is the vapor pressure of ethonal at 75°c?

i am greater than 30 and less than 40 the sum of my digits is less than 5

227. ## Math

20% of a number is 8 ... fine the number 20 divided by 100 is 5, 8 divided by 5 is 1.6 is the answer 1.6/8 ?

228. ## science: ap chem

is NaH2CO3 soluble and separate into Na+ and H2CO3- ions?

229. ## Calculus

Find the equation of the tangent line to the curve y=1+ xe^(2x) y'=(e^(2x))(2x+1) = slope What's the next step?

230. ## Algebra

factor completely -36c^4 + 289c^2 -400

231. ## Math Site

Is there an online site that talks about Linear Relations thoroughly. Could you please post links to some. I tried going to mathisfun. c o m , because that is usually the only site which explains everything well and fits everything into my head;

232. ## english

In the book, When the Legends Die, what does it mean when Tom draws the deer in the dirt?

233. ## Gen Chemistry

[Ag(NH3)2]+ is a colorless complex ion right?

234. ## global

How did geography help hinder Allied advances?

235. ## Gen Chemistry

[Ag(NH3)2]+ is a colorless complex ion right?

236. ## english

Which sentence below contains a dangling modifier? 1. I threw the newspaper in the waste basket after I read the editorial. After I read the editorial, I threw the paper away. After reading the editorial, I placed the newspaper in the waste basket. After

237. ## Chemistry

What must be the pH of a solution that is 0.049 M Fe3+ to just cause Fe(OH)3(s) to precipitate?

238. ## Grammar and Composition

I'm having trouble writing a sentence using the word accentuate It means to give emphasis to something

239. ## englísh

what group have responiblity for weather forcasting

240. ## English

1. I brushed my teeth as I took a shower. 2. I brushed my teeth because I took a shower. 3. I brushed my teeth while I took a shower. 4. I brushed my teeth taking a shower. (Does #1 mean #2 or #3? Is #3 the same as #4?)

241. ## Trigonometry

Prove it is an identity. (sin^2x)/(tanx)=sinxcosx

242. ## English

1. I brushed my teeth so I took a shower. 2. I brushed my teeth because I took a shower. (Are both grammatical? What do they mean?)

243. ## chemistry

sodium azide, decomposes according to the following equation: 2NaN3 (s) -> 2Na (s) + 3N2(g) What mass of sodium azide is required to provide nitrogen needen to inflate a 80.0 L bag to a pressure to 1.35 atm at 25 c?

244. ## chemistry

how many moles of acid must be added to the blood to bring the carbonic acid/hydrogen carbonate ratio from 1:2 to 1:10?

245. ## Chemistry

Calculate the molar solubility of barium thiosulfate in 0.0045 M Na2S2O3(aq). (Hint: Check any simplifying assumptions that you make.)

246. ## English

Which sentence below contains a dangling modifier? Finding a place to sleep, the bed was comfortable. The bed was a comfortable place to sleep. Finding a place to sleep was difficult. Finding a place to sleep, the children thought the bed was comfortable

247. ## Math

A student asks what exactly Euclidean geometry is. How do you answer?

248. ## english

Which sentence below contains a dangling modifier? Keeping to himself, the corner of the room seemed like a good place to stand. John kept to himself by standing in the corner. Standing in the corner, John kept to himself. Keeping to himself, John stood in

249. ## chemistry

( from the previous chemistry question)hydration just means H2O would attach to the ions, right? would the H2O attach to the -F to form larger molecules? how does the entropy change from that?

250. ## math

(x^5/x^2 6x 9) (5/x^2 5x 6)

251. ## Algebra

7. Johnny needs to save \$24.00 to buy a new video game. Three weeks after saving, he has \$6.00. After 6 weeks, he has \$12.00. If Johnny continues to save at this rate, how many total weeks will he have saved money to reach his goal? The answer I got was 12

252. ## social studies

what role does the media play in shaping government policy and actions?

why do people communicate

254. ## math

two trains start from towns 208 miles apart and travel towards each other on parallel tracks. They pass each other 1.6 hours later. If one travels 10 mph faster than the other find the speed of each train?

255. ## MATH

20% of a number is 8 ... fine the number 20 divided by 100 is 5, 8 divided by 5 is 1.6 is the answer 1.6/8 ?

256. ## English

1. I am leaving now to take the train. 2. I am moving now to take the train. 3. I will leave now to take the train. (Does #1 mean #2 or #3? Is the subject moving or is the subject going to move in the near future?)

257. ## Human Services

Garison Ford has complained that his supervisor has not given him an opportunity to take on any of the more serious field assignments in the unit. He thinks it is because of his age and he cites age discrimination... I need 3 Pros and 3 Cons of how to

258. ## statistics

a mathematics professor wishes to analyze the relationship between the number of papers graded by his department's student homework graders an the total amount of money paid to the graders. He collects data for 12 randomly chosen graders and uses MINITAB

259. ## Chemistry

How can the Tyndall effect be used to distinguish between a colloid and a solution? Can the presence of Brownian motion distinguis between a solution and a colloid? explain.

260. ## math

a jar contain 8 blue blocks 4 red ,9 orange and 4 green ones. About what fraction of the time would you expect to pull out a blue block?

261. ## trig

solve for all solutions sin(x)=sin(2x)

262. ## Precalculus(URGENT)

write the parabola in y squared=4ax or x squared =4ax form where x equals the distance between the foci and the centerpoint y= -(x+3)squared +4 i have no idea how to do this can you tell me how you got the solution

asked by Arielt -Help now fast due tommorow
263. ## Calculus

Find the derivative of (sin(^3)x)(tan x) Please explain to me in steps please , thank you

264. ## trig

evaluate the following without using a calculator and please explain how cos(arctan 3)

265. ## MATH

WHAT PERCENTAGE OF 186,000.00 IS 30,000.00?

266. ## Chemistry - Heat Calculations

Calculate the heat released when 4 L Cl2 with a density of 2.46 g/L at 25 degrees C reacts with an excess of sodium to form solid sodium chloride at 25 degrees C.

267. ## English

1. He was sick so he couldn't go to work. 2. He was sick, so he couldn't go to work. 3. He was sick so that he couldn't go to work. (What is the difference among them? Does #1 mean #2 or #3? What is the meaning of #1?)

268. ## chemistry

How to calculate enthalpy change of the following reaction? : S + 2h2o >>> so2 + 2h2 given: s+o2 >>> so2 - enthalpy change = -296.8 kJ h2 + 1/2o2 >> h20 enthalpy change= -285.8kj I was trying to solve it myself but i got confused.. i know i have to change

269. ## science

Between 1960 through 1980 which year produced the greatest percentage of fish?

270. ## statistics

When you add the values 3, 5, 8,12, and 20 and then divide by the number of values, the result is 9.6. Which term best describes this value: average, mean, median, mode, or standard deviation?

Mr. Kimball has a swimming pool that measures 20 feet long by 15 feet wide. He is adding a walkway around the pool that is 3 feet wide all around. What will be the perimeter of the walkway?

272. ## Science

A chemist weighed out 5.16 g of a mixture containing unknown amunts of BaO(s) and CaO(s) and placed the sample in a 1.50-L flask containing CO2(g) at 30.0°C and 750. torr. After the reaction to form BaCO3(s) and CaCO3(s) was completed, the pressure of