# Questions Asked onMarch 23, 2010

1. ## Implicit Differentation-Cal

if sin(xy)=x, then dy/dx=

2. ## College Chemistry

Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 215 mg/L. I calculated the molarity as 1.58*10^-3 and the Ka as 1.58*10^-10. I did ICE and i got the pH as 6.3, but it was

3. ## College Chemistry

Calculate the ratio of NaF to HF required to create a buffer with pH=3.95. Also, can you please explain in a nutshell the whole concept of buffers? Thanks!

4. ## physics

In a physics lab experiment, a spring clamped to the table shoots a 22 g ball horizontally. When the spring is compressed 22 cm, the ball travels horizontally 5.2 m and lands on the floor 1.3 m below the point at which it left the spring. What is the

5. ## Chemistry

Which of the following represents a pair of isotopes? Atomic Number Mass Number a. I 7 16 II 8 16 b. I 17 34 II 18 36 c. I 17 35 II 17 37 d. I 7 14 II 8 16 e. I 17 37 II 18 37

write 3 different improper fractions that equal 4 2/3

7. ## calculus

let f be the function f(x) = x^3 + 3x^2 - x + 2 a. the tangent to the graph of f at the point P = (-2,8) intersects the graph of f again at the point Q. Find the coordinates of point Q. b. Find the coordinates of point R, the inflection point of the graph

8. ## Physics

(c22p46) A light ray of wavelength 589 nm is incident at an angle θ on the top surface of a block of polystyrene surrounded by air. PART 3: Find the maximum value of θ for which the refracted ray will undergo total internal reflection at the left

9. ## chemistry

Which of the following formulas -- NO, N2O, NO2, N2O, N2O4, AND N205 -- represent the empirical and molecular formulas of the same compound?

10. ## Chemistry

Determine the [OH^-] of a solution that is 0.145 M in CO3^2-.

11. ## statistics

A multiple choice test has 20 questions with each having 4 possible answers with one correct. Assume a student randomly guesses the answer to every question. 1) What is the probability of getting exactly 9 correct answers? 2)What is the probability of

12. ## college physics

A(n) 13,300 lb railroad car traveling at 7.4 ft/s couples with a stationary car of 6790 lb. The acceleration of gravity is 32 ft/s^2. What is their velocity after the collision (ft/s)? And what impulse did the first car receive? Answer in units of lbs. Any

13. ## Chemistry

Identify the spectator ion(s) in the following reaction: Cu(OH)2(s) + 2H+(aq) + 2Cl–(aq) Cu2+(aq) + 2Cl–(aq) + 2H2O(l) a. Cu2+ and Cl- b. H+ and Cl– c. Cu(OH)2 d. Cl– e. Cu2+

14. ## chemistry

a 1.009g mixture of the solid salts Na2SO4 and forms an aqueous solution with the precipitation of PbSO4. The precipitate was filtered and dried and its mass was determined to be .471 g. the limiting reactant was determined to be Na2SO4. Write the

15. ## Chemistry

Which of the following species would NOT function as an oxidizing agent? a. MnO4- b. Mn+2 c. H+ d. S e. Br-

16. ## math

An arch is in the form of a semi-ellipse, with its major axis as the span. If the span is 80 feet and the height is 30 feet write the standard equation.

17. ## organic chemistry

urgent, please help me...this is about the separation and purification scheme... there is 4 group of mixture: a)benzoic acid, benzoin and 1,4-dibromobenzene b)fluorene, o-toluic acid and 1,4-dibromobenzene c)phenanthrene, methyl 4-aminobenzoate and

18. ## Chemistry

What is the reduction half-reaction for the reaction between iron(II) sulfate and potassium permanganate in a sulfuric acid solution? 5Fe2+(aq) + MnO4–(aq) + 8H+(aq) --> 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) a. MnO4– + 3e– -->Mn2+(aq) + 4H2O b. MnO4–(aq)

19. ## chemistry

Which of the following is a weak electrolyte in aqueous solution? a. H2SO3 b. HNO3 c. HBr d. HClO4 e. NaOH

20. ## Chemistry

What is the reduction half-reaction for the reaction between iron(II) sulfate and potassium permanganate in a sulfuric acid solution? 5Fe2+(aq) + MnO4–(aq) + 8H+(aq) --> 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) a. MnO4– + 3e– --> Mn2+(aq) + 4H2O b. MnO4–(aq)

21. ## physics

An electron is accelerated horizontally from rest in a television picture tube by a potential difference of 5400V . It then passes between two horizontal plates 6.1cm long and 1.2cm apart that have a potential difference of 250V At what angle will the

22. ## PHYSICS

RESPONDING TO AN ALARM, A 102 KG FIREMAN GETS UP FROM DINNER AND SLIDES DOWN A POLE TO THE GROUND FLOOR OF THE BUILDING, 3.3 M BELOW. THE FIREMEN STARTS AT REST AND LANDS ON THE GROUND FLOOR WITH A SPEED OF 4.2 M/S. A.FIND THE FORCE EXERTED ON THE FIREMEN

23. ## calculus

Let A be the area if the region in the first quadrant under the graph of y = cos(x) and above the line y = k for 0 < k < 1. a. Determine A in terms of k. b. Determine the value of A when k = 1/2 c. If the line y = k is moving upward at a rate of 1/pi units

24. ## physics

A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact?

25. ## Physics

A non-rotating spherical planet with no atmosphere has a mass M and radius R. A particle is fired off from the surface with a speed equal to 3/4 the escape speed. Calculate the farthest distance it reaches (measured from the center of the planet) if it is

26. ## Chemistry

Identify the spectator ion(s) in the following reaction: Cu(OH)2(s) + 2H+(aq) + 2Cl–(aq) ---> Cu2+(aq) + 2Cl–(aq) + 2H2O(l) a. Cu2+ and Cl- b. H+ and Cl– c. Cu(OH)2 d. Cl– e. Cu2+

27. ## PHYSICS-repost

A small glass bead has been charged to +19 nC. A metal ball bearing 1.0 cm above the bead feels a 0.030 N downward electric force. What is the charge on the ball bearing?

Unscramble cioponam

29. ## physics

What is the frequency of the microwaves in a microwave oven? The wavelength is 12 cm. I have to give the answer in GHz

30. ## Chemistry

A .972g sample of a Cacl2 2H2O/K2C2O4 H2O solid salt mixture is dissolved in 150 ml of deionized water, previously adjusted to a pH that is basic . The precipitate after having been filtered and air dried has a mass of .375g. what is the percent by mass of

31. ## physics

A small glass bead has been charged to +19 nC. A metal ball bearing 1.0 cm above the bead feels a 0.030 N downward electric force. What is the charge on the ball bearing?

32. ## Physics

A skateboard rider starts from rest and maintains a constant acceleration of +0.50 m/s squared for 8.4 s. What is the rider's displacement during this time?

33. ## physics

A pigeon in flight experiences a force of air resistance given approximately by F=bv2, where V is the flight speed and B is a constant. A) In terms of SI units, what are the units for the constant "b"? B) What is the largest possible speed of the pigeon if

34. ## math

could someone please help.... a cottage under construction is to be 35.6m wide. the two sides of the roof are to be supported by equal rafters that meet at a 52 degree angle. determine the length of the rafters to the nearest cm using the cosine law and

35. ## Student supervision

1. Which of the following infectious diseases accounts for 60 to 80 percent of all school absenteeism? A. Upper-respiratory infections B. Pinkeye C. Tuberculosis D. Hepatitis A and B 2. Which of the following statements about playground monitors is

Find the angle of elevation of the of the sun when a 12.5 meter tall telephone pole cast a 18 meter shadow.

37. ## spanish

una familia grande tiene muchas y una familia pequena tiene pocas

38. ## Math 101

Find the equation for each of the following items below: a. A line that passes through (6,26) and has a slope of 3. b. A line that passes though the points (5,5) and (10,20) c. A line that passes through (9,25) and has a slope of -3. d. A line that passes

asked by SEMA , Need Help
39. ## Physics for life science

1. A car starts from rest and accelerates at a constant rate to 80km/h in 6s in positive direction. What is the acceleration? 2. After how long will the car speed be 120km/h if it keep accelerating at the same rate as in 1.? 3.After the car reached speed

40. ## Chemistry

What volume of 0.025 M sodium bromide, NaBr, contains 2.0 ´ 10-4 mole of Br-? a. 0.040 L b. 0.080 L c. 4.0 mL d. 8.0 mL e. 16 mL

41. ## English

1. First, let me introduce my friend to you. His name is Seho. He is my classmate. He is also my neighbor. He got the first prize in the English speech contest. 2. First, I'd like to introduce my classmate, who is my neighbor and got the first prize in the

42. ## statistics

slot machines are now video games, with outcomes determined by random number generations. in the old days, slot machines were like this: you pull the lever to spin 3 wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops

43. ## Math

3/8 of the 40 little engines could climb the hill. How many engines were in each part? How many parts could climb the hill? How many engines could climb the hill? How many parts could not climb the hill? How many engines could not climb the hill?

44. ## Biology

Respond to this question: "If a plant doesn't have enough water to openits guard cells, how would this affect its rate of transpiration?" In your answer, discuss the following: - the guard cell's role in transpiration - what effect this would have on the

45. ## chemistry

how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?

46. ## ALGEBRA

Find the distance between two points which have the coordinates of (5,1) and (8, 5).

47. ## physics

I;m sorry, but I was stuck on the second part of this problem. Can you please help me? An automobile engine slows down from 4500 rpm to 1500 rpm in 2.5 seconds. a) calculate angular accceleration b)calculate total number of revolutions done in this time.

Ms. Ross's class has 24 students.2/3 of her students have brown hair.The rest have blonde hair.How many students have blonde hair?

49. ## Biostatistics

if we select a birth at random, what is the probability the mother is 19 years of age or younger

50. ## Chemistry

2Li(s) + 2H+(aq) + SO42–(aq) ---> 2Li+(aq) + SO42–(aq) + H2(g) The reaction shown above between lithium and sulfuric acid is best described as 1 acid-base. 2 oxidation-reduction. 3 precipitation. a. 1 only b. 2 only c. 3 only d. 1 and 2 only e. 1, 2,

51. ## Physics

1. A pair of narrow, parallel slits separated by a distance of 0.408 mm are illuminated by green laser light with wavelength of λ = 537.5 nm. The interference pattern is observed on a screen 1.56 m from the plane of the parallel slits. Calculate the

52. ## chemistry

Urgent. The melting point of pure acetylsalicylic acid is 135 degrees celsius. Comment on the purity of your product based on its melting point range. My melting point range was 105-115. I do not even know where to start for this question. Could you please

53. ## Poetry

What is one metaphor and one simile in the poem "Leaning Into The Afternoons" by Pablo Neruda? What do they mean and how do they aid what Neruda is trying to state in the poem? I NEED HELP PLAEASE!!!!!

54. ## physics

I;m sorry, but I was stuck on the second part of this problem. Can you please help me? An automobile engine slows down from 4500 rpm to 1500 rpm in 2.5 seconds. a) calculate angular accceleration b)calculate total number of revolutions done in this time.

55. ## physics

What is the wavelength of the radio waves broadcast by an FM radio station with a frequency of 90.5 MHz?

56. ## chemistry

Does the basicity decreases as going down the column and right across the periodic table? How does the size of an element or electronegativity apply to strength of basicity and acidicity?

57. ## chemistry

Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 4 state to the n = 3 state.

58. ## calculus

Consider the graphs of y = 3x + c and y^2 = 6x, where c is a real constant. a. Determine all values of c for which the graphs intersect in two distinct points. b. suppose c = -3/2. Find the area of the region enclosed by the two curves. c. suppose c = 0.

59. ## english

using rhetorical devices write a passage(300 words) on a person, idea or ideology.

60. ## physics

A beam of electrons moves at right angles to a magnetic field of 7.2 multiplied by 10-2 T. The electrons have a velocity of 2.5 multiplied by 106 m/s. What is the magnitude of the force on each electron?

61. ## Chemistry

Which of the following ions has the smallest radius: Ca2+, K+, F-, or Cl-? Would it be K+, because it is a cation, making it have a smaller radius?

62. ## Chemistry

What does the study of the periodic table have to do with classification and prediction?

63. ## chemistry

what is the energy needed to melt 5.62 moes of ice in 0'C

64. ## Personal Finance

Mary just deposited \$33,000 in an account paying 7% interest. She plans to leave the money in this account for eight years. How much will she have in the account at the end of the seventh year? Mary and Joe would like to save up \$10,000 by the end of three

65. ## phy

A marble slides without friction in a vertical plane around the inside of a smooth, 21 cm-diameter horizontal pipe. The marble's speed at the bottom is 4.5 m/s this is fast enough so that the marble makes a complete loop, never losing contact with the

66. ## PHY 131

three forces act on a moving force object. one cforce has a magnitude of 80.O N and is directed due north. another has a magnitude of 60.0N and is due west. What must the magnitude and direction of the 3rd force, such that the object continues to move at a

67. ## statistics

Find the indicated binomial probabilities. Round to the nearest 3 decimal places. In a local college, 20% of the math majors are women. Ten math majors are chosen at random. 1) What is the probability that exactly 2 are women? 2) What is the probability

68. ## physics

A plane progressive wave on a water surface is given by the equation y=2sin2pi(100t-x/30) where x-is the distance covered in a time t, x, y and t are cm and second respectively. Find (i) the wavelength and frequency of the wave motion. (ii) the phase

69. ## chemistry

1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the E of the overall cell? ClO3-(aq) + H2O(l) + 2e- ==> ClO2-(aq) + 2OH-(aq) Eo= 0.35 V I2(S) + 2e-==> 2I-(aq) Eo = 0.54 V A)dE will increase B)dE will

70. ## algebra

As a restaurant owner there are many decisions that you need to make on a daily basis, such as inventory levels. You wish to replenish your stock of dishes by purchasing 250 sets for your restaurant. You have available two different dish designs. One

71. ## stats

you have torn a tendon and are facing surgery to repair it. the surgeon explains the risk to you: infection occurs 3% of such operations, the repair fails in 14%, and both infection and failure occur together in 1%. what percent of these operations succeed

72. ## Physics for life scince

II.You are standing on the edge of a 50m high cliff and throw a ball vertically up with initial speed of 20m/s: 1.After how long will the ball hit the ground below? 2.Draw the v vs.t graph

given that a(-1,8) ,b(2,4) and if the line y=4 is the axis of symmetry of triangle abc find c.show that triangle abc is an isosceles triangle,calculate the area of triangle abc,calculate the perpendicular distance from a to bc

74. ## Math(Correction)

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan = 2sqrt6 a) cos Q b) cotQ c)

75. ## accounting

Hutton Company uses a sales journal, a purchases journal, a cash receipts journal, a cash disbursement journal, and a general journal. The following transactions occur in the month of March: 1) Mar 2 Sold merchandise costing \$300 to B !@#\$%^&er for \$450

76. ## Math

What must be true for a pentagon so that it will tessellate a plane?

77. ## Math(Correction)

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan Q = 2sqrt6 a) cos Q b) cotQ c)

78. ## Chemistry

Rank the elements Ca, As, K, Br from highest to lowest first ionization energy. (Type your answer using the format W>X>Y>Z.) Would the answer be: K>Ca>As>B

79. ## Math

I'm trying to perform the indicated operations, and reduce to lowest terms, but I'm not sure if I got the correct answer. The question is y-5/(x^2+5x)+(xy+5y) + 1/x+y - 2/x+5....I got y-6, but am not sure if that is correct.

80. ## math

Which conic section is represented by the equation? x^2 - y^2 + 24x + 4y + 28 = 0.

81. ## Math Probability

In a bag of 10 marbles, there are 5 blue marbles, 3 red marbles, and 2 white marbles. Complete the probability distribution table for drawing 1 marble out of the bag Probability Blue marble Red marble White marble Total:

82. ## psychology paper

Hello I have to write a paper and part of the paper is asking for information I am not sure which way to go if some one can please help me with this I would appreciate it the section I am having a problem with is Explain the criticism of artificiality in

84. ## ALGEBRA

Solve the equation SQRT(x+3) + 1 = 8; find the value of x.

85. ## Math(Correction)

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. Sorry for the mistake. They are two separate

86. ## language mechanics

your term paper in my opinion,is very good. A); B), C). D)none is it (D)

87. ## physics

A car approaches the top of a hill that is shaped like a vertical circle with a radius of 58.2 m. What is the fastest speed that the car can go over the hill without losing contact with the ground?

88. ## Poetry

How can I explain the first five lines in the poem "Leaning Into The Afternoons" by Pablo Neruda? Leaning into the afternoons, I cast my sad nets towards your oceanic eyes. There, in the highest blaze my solitude lengthens and flames; Its arms turning like

89. ## physics

Magnet A has twice the magnetic field strength of magnet B and at a certain distance pulls on magnet B with a force of 75 N. With how much force, then, does magnet B pull on magnet A?

90. ## chemistry

how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?

91. ## science

What would be the final temperature of a mixture of 50 g of 20 0C water and 50 g of 40 0C water. I'm really not sure how to do this do I need to convert 20 Celsius to Fahrenheit to start? what are the steps for this?

92. ## Teacher Aide

Where would you most likely find a token economy as a form of classroom management? A} RRP B} Contract approach C} Contingency management approach D} RIP approach

93. ## Math

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan = 2sqrt6 a) cos Q b) cotQ c)

94. ## statistics

Find the indicated binomial probabilities. Round to the nearest 3 decimal places. In a local college, 20% of the math majors are women. Ten math majors are chosen at random. 1) What is the probability that exactly 2 are women? 2) What is the probability

95. ## english

write a passage (300 words)using rhetorical devices on a person,idea or ideology.

96. ## physic12-dymanics

A block is launched up the incline(coefficient of friction is 0.3) with an initial speed of 12m/s. What is the maxximum displacement of the block up the incline?

97. ## Math

How much does Jane pay for 1 pound 12 ounces of apples at \$1.96 per pound?

98. ## language mechanics

"this homemade ice cream tastes great"she exclaimed A); B)! C)? D)none is it (B)

99. ## physics

A vibrator attached and resting on the surface of water generates plane water waves and its propagation is found to take 50 seconds to reach a floating cork 65 cm away. If the cork subsequently vibrates with SHM of a period 3.8 seconds, determine the

100. ## College Physics

A 5.0 gram coin is placed 5.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 36 RPM is reached and the coin slides off. A.) What is

101. ## Poetry

What would be a good thesis statement for "Mid-Term Break" by Seamus Heaney I've read it about 100 times and I've analyzed it a bunch of times and need help with at least two of the three prong thesis statement.

102. ## English

What does the phrase "Youth will be served" in Jack London's short story "A Piece of Steak mean?

103. ## Environmental Science

For my research paper on Coral Reefs, can someone please help me write an intro paragraph? I think I should first start by writing a thesis statement, although I'm not sure if thesis statements are required in research papers. If so, please help me. This

104. ## nutrition

What is the difference between simple and complex carbohydrates? How are sugars are broken down and used in the body? What are the benefits that carbohydrates provide to the body? I need help finding where I would find this infomation....I have found sites

105. ## Physics

A car is driven 135 km west and then 40 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?

106. ## physics

A wire 28 cm long is parallel to a 0.36 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire? What equation do you use? I tried F= ILBsin(90) and that didn't work!

Find all real zeros of the function y= 3x+8

108. ## math

simplify the expression (4+7)x3 write the steps used to simplify.

109. ## University Physics II

A 13.9 nC charge is located at position (x,y) = (1cm,2cm). A. At what (x,y) position is the electrical field -225,000i_hat N/C? B. At what (x,y) position is the electrical field (-161,000i_hat + 80,500j_hat) N/C? C. At what (x,y) position is the electrical

110. ## biology

How could a substance that stops the sythesis of mRNA cause the liver to stop functioning(the death of liver cells)?

111. ## Physics for life scince

The population of Singapore is 4987600 people. The territory of Singapore is 710.2 km^2. the population of South Africa is 2171000people, while its territtory is 824292. Estimate the population densities of Singapore and South Africa.

112. ## chemistry

what is an example of autocatalysis? what will the graph of the rate of an autocatalytic reaction versus time look like?

113. ## Biology

What are 3 ways that guppy fish interect (symbiosis,mutualism etc.) please provide a website:) thanks:)

114. ## Chemistry

When you look up the atomic masses of Si and Sn and then find the average and then look up the atomic mass of Ge, what is discovered? does it lend supporting evidence to the periodicity of elements?

115. ## English

Can you please tell me if the following statements regarding school rules are correct? Thanks a lot. 1) You must: do your homework regularly, always bring your books to class, put up your hand if you want to ask your teacher a question or answer your

116. ## Illegal Drugs

2. CheckPoint: Introduction and Conclusion · Resource: Drafting Your Research Paper · Consider the components of an effective introduction and an effective conclusion outlined in Drafting Your Research Paper. · Write an introduction for your research

117. ## spanish

what does "si no sabes la hora de un programa, ¿què haces?" mean and how would you answer that question?

118. ## Chemistry

Is Al(OH)3 soluble in KOH or K2C2O4•3H2O?

119. ## ALGEBRA

Solve the equation SQRT(x+3) + 1 = 8; find the value of x.

120. ## math b

the function for the perimeter of a rectangle is given as P=4x+6 a) Give an expression for the length of the rectangle in terms of the width. b) If the width is half the length, state a function for both the width and length describing the domain for which

121. ## college chem

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5

122. ## Math

What is the measure of the dent angle for a star-shaped polygon with 8 points and a point angle of 20 degrees?

123. ## Chemistry

why do elements within a group have similar chemical properties?

124. ## Science-Repost

I just want to make sure if I'm correct; does this look correct to you? When all of the hydrogen of the Sun is used up, it will turn into a red giant. Is red giant correct?

125. ## government

Which is not a long-term trend marking the expansion of suffrage in the US?

126. ## Poetry

What is one metaphor and one simile in the poem "Leaning Into The Afternoons" by Pablo Neruda? What do they mean and how do they aid what Neruda is trying to state in the poem?

127. ## social studies

what are 5 ways the federal government helps United States citizens? (specifically, teenagers in this case)

128. ## Physics

A car is driven 135 km west and then 40 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?

A wire 28 cm long is parallel to a 0.36 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire? What equation do you use?

130. ## Chemistry

Calculate the quantity of heat released when 0.520 mol of sulfur is burned in air. uising the enthalpy detalH= -296

131. ## Statistics

In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1,143 were positive. (a) Construct a 95 percent confidence interval for the population proportion of

132. ## geometry

the perimeter of a rhombus is 36 inches. if the longer diagonal is 14 inches what is the length of the shorter diagonal of the rhombus?

133. ## Math

Nick has done 35% of his homework. He had been working for 28 minutes. How long will it take him to finish his homework?

134. ## Physics for life scince

6.At the end of the 7th second the brakes are applied and the car slows down at a constant rate till it comes to rest in 5s. What is the acceleration? 7.Draw the v vs.t graph 8.find the final displacement: a)by using the graph b)by algebraic calculations

135. ## chemistry

Which of the following is a weak electrolyte in aqueous solution? a. acetic acid b. lithium acetate c. ammonium carbonate d. sulfuric acid e. calcium hydroxide

136. ## Math

Prove Trig. Identities 1. sec è (sec è - cos è)= tan^2 è 2. tan^2 è (1 + cot^2 è) = sec^2 è

137. ## social studies

What country did General Douglas MacArthur fight Japanese troops for?

138. ## algebra

Find the equation for the line parallel to 2x+y=6 and passing through (2, 6). Justify your response.

139. ## ?Cal/Trig??

Suppose the circumference of a circle is increasing at a rate of 3 cm/s. Find the rate at which the area of the circle is changing when the area is 64pi square centimeters. nEEd ALot of HELP on this one. !! PLZ. Jayden--CUHS

140. ## Science

We did a experiment in class to recognize chemical change. I don't really get this question: Identify the combinations of chemicals in which chemical changes occurred. If the chemical changes occured in all of the combinations, then what would be a good

The ultimate task of all the explorations launched by the Europeans from the fourteenth century onward was? A. finding a sea link between Europe and the wealthy civilizations of Asia. B. establishing European political dominion over all of Asia. C.

soil dwelling insects are examples of invertabrates. explain why this statement is true and use examples of two soil dwelling insects

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

144. ## math

4a -a = A)4 B)3-a C)5a D)4a to the 2 power E) none

145. ## chemistry

a gas is collected over water at 18 degrees celsius at a pressure 755mm. what is the partial pressure of the gas?

146. ## Physics

1a. Two converging lenses, each of focal length 14.4 cm, are placed 60.6 cm apart, and an object is placed 26.9 cm in front of the first. Where is the final image relative to the second lens formed? b. What is the magnification of the system?

147. ## DERIVITIVES!!HELP

if y=1/2ln(x^2+5), then dy/dx=

148. ## To CC

Here is the question you initially posted @ 10:22 last night (Sunday) with my responses. Here are the corrections I made. Check my arithmetic. http://www.jiskha.com/display.cgi?id=1269310966

149. ## Chemistry

1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the E of the overall cell? ClO3-(aq) + H2O(l) + 2e- ==> ClO2-(aq) + 2OH-(aq) Eo= 0.35 V I2(S) + 2e-==> 2I-(aq) Eo = 0.54 V A)dE will increase B)dE will

150. ## chemistry

how will the potentail of the hydrogen/oxygen fuel cell change if the pressure of the gasses was increased from 1 atm to 3 atm

151. ## Physics for life scince

III) The municipality of New York supplies 2 million cubic metres of water per month to the city of New York. If a household consumes about 30killo-littres of water per month, estimate the number of residents in New York ,assuming that a household has five

152. ## Math-Calculus

i have to questions that just need to be checked on to see if i got them right. Lim x-->infinity for both problems 10/x+10 is number one i got 0 for this one. or is it does not exist. lim x-->infinity 6x/6x+5 for this one I got One. (1) is that correct.??

153. ## Chemistry

If 20.00mL of a solution that contains oxalate ion requires 10.00mL of 0.020M MnO4- solution in a titration, what was the molarity of the oxalate solution? 5C2O42- + 2MnO4- + 12H+ --> 2Mn2+ + 10CO2 + 8 H2O

154. ## math

A storage area measures 12 feet 6 inches in width by 16 feet in length by 8 feet 3 inches in height. If it is 4/5 full, how many cubic feet of storage space remains (rounded to the nearest cubic foot)?

156. ## math

The speed of a boat in still water is 8 km/h. It travels 60 km upstream and 60 km downstream in a total time of 16 hours. What is the speed of the stream?

157. ## ALGEBRA

1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where

158. ## ALGEBRA

2. The equation D=2.2√ h gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a. Solve this equation for h. b. If Long’s Peak in Rocky Mountain National Park, is 14,275 feet in elevation, how far can you see

159. ## AP US History

how did j.p. morgan contributed to the industrialization of america and how they led to the rise of the united states as a world power?

160. ## physic12-dymanics

A 5kg block slides down an incline of 25 degrees to the horizontal at a constant speed. a) what is the net force on the block? b) what is the magnitude of the friction force acting on the block? c) If friction was negligible and the block was accelerating

161. ## Chemistry

A solution of copper(II) hydroxide is heated. Which of the following best represents the balanced, net ionic equation?

162. ## chemistry

a gas is collected over water at 18 degrees celsius at a pressure 755mm. what is the partial pressure of the gas?

163. ## physics 12- dynamics

A 5kg block slides down an incline of 25

164. ## algebra

how do you convert these 2 problems to slope intercept form? -2x=-1y-6 3x+3y=-18

165. ## U.S. History

Is there a good online source of information to compare and contrast the initial formation of two states—Virginia and Pennsylvania—by evaluating and listing the similarities and differences of the first state constitution for each state.

(-4x+2)(x+5)

167. ## us history

Is there a good online source of information to compare and contrast the initial formation of two states—Virginia and Pennsylvania—by evaluating and listing the similarities and differences of the first state constitution for each state.

168. ## geometry

Determine whether the triple of numbers can be the sides of a right triangle.

169. ## chemistry

nitrogen+hydrogen=ammonia

170. ## math

what percent of 80 is 32 F)25% G)2.5% H)0.4% J)40% K)none i got 25.6% what is it then

171. ## chemistry

Sam had 3 grams of aluminum to react with 16 grams of CuSO4 How many moles of pure copper could she recover

172. ## Calculus

Lim x-->infinity 10/x+10 find the limit

173. ## Math

Having trouble knowing where to start with this one: A maker of tools claims the average amount of time it takes to assemble a table saw is 50 mins with a standard deviation of 40 mins. What is the probability that the sample mean will be less than 44 mins

174. ## trig/PreCalc

Find all real zeros of the function y = -7 + 4

175. ## Chemistry

Beside the usual method of titrating with KMNO4, what is/are the alternative method/s to test for the presence/amount of oxalate in a compound?

176. ## social studies

How did quebec act of 1774 influences the canadian society today? (i need to write an essay for this help ASAP)

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

178. ## help me

I'm brown, I have two eyes and no ears. I'm brown on the outside and white on the inside.. What am I?

179. ## FINANCE

Life for Kids Company, a small producer of plastic swimming toys, wants to determine the most it should pay to purchase a particular ordinary annuity. The annuity consists of cash flows of \$700 at the end of each year for 5 years. The firm requires the

180. ## calculus

find the length of the curve;x^2=a^2(1-e^(y/a))measured from(0,0) to(x,y) is a log(a+x/a-x)-x.

181. ## Math

Use FTC to evaluate a definite integral with basic integrand-- (integral) bottom number 0, top #2 (4x^3+1)dx=

182. ## science

How does the rainshadow effect happen?

183. ## spanish

How do you say when you want just call me in spanish?,, is cuando tu quierez riqht?

184. ## math

a motorboat traveling with the curent went 68 miles in 3hrs and 24mins. against the current, it took 4hrs and 15 mins to travel the same distance. find the rate of the motorboat in calm water and the rate of the current.

How will you apply the knowledge you have gained about effective business communication in you current jobs and college courses

186. ## chem

How/ why are insoluble subtances soluble?

187. ## bis/219

discuss how amazon book stores address ethical, legal, and security issues?

Find two functions f and g such that (f X g)(x) = h(x). ( There are many correct answers. My answers were f(x) = 4/5x and g(x) = 5x + 2 but this was wrong.

189. ## Pre-Cal

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

190. ## hca/210

what is one strength in the u.s. health care system?

191. ## Physics

Two infinitely long wires are separated by a distance of d = 1.4 meters. Both have current running in the positive y direction. A charge of q = +2.7 micro-Coulombs is moving in the positive y direction at v = 3.1 E 6 m/s a distance of r = 0.22 meters from

192. ## calculus

find an antiderivitive for integral(f looking sing)3/3x+4 dx

193. ## CAL--

what is FTC? use ftc to evaluate a definite integral with basic integrand. f looking sign, integral bottom number 0 top number 2 (4x^3+1) dx=

194. ## Chemistry

What are some periodic trends among the following elements- carbon, silicon,germanium,tin, and lead?

196. ## ALGEBRA

Find a set of values for a and b that will result into a rectangular computer monitor with a diagonal (c) of 20".

197. ## pPhysics for life scince

4.The brakes are applied at the end of the 100s and the car comes to a stop within 20m, slowing down at a constant rate. What is acceleration? 5.Now the car turns back and its speed increases at 5m/s^2 for 7s. What is its speed at the end of 7th second?

198. ## math

the function for the perimeter of a rectangle is given as P=4x+6 a) Give an expression for the length of the rectangle in terms of the width. b) If the width is half the length, state a function for both the width and length describing the domain for which

199. ## vowel

which vowel is most often used to connect two Latin bases in a word? a. a b. e c. i d. o p.s. what do you think?...i choose a..?

200. ## Mathematics

I have the polynomial x^2+2x-8 and when I tried to factor it, I just ended up confusing myself. Can anyone please help make sense of this?

201. ## strom thurmond

x + y = 15 4x + 3y = 38

202. ## Chemistry

I need help describing some periodic trends in the periodic table

203. ## English

What are good sentences using the words: frivolous, coy and conceive Frivolous- of little weight or importance; having no sound bases Coy- shrinking from contact or familiarity Conceive- to take into ones mind Using these definitions, can you come up with

204. ## English

Are these two sentences good: The hall of mirrors gave me a confound feeling. Confound- to throw into confusion or perplexity I told my mom that i was going to the movies but, she gave me one circumstance and that was to call her when i get there.

205. ## college

explain how mccarthyism affected the lives and political thinking of people in the u.s

206. ## Economics

i need a topic for changes in supply, changes in demand and government policy and how can i apply ecomomic concepts to them?

NEED TO DO A POSTER ON DRUG FREE THATS ME, PLEASE GIVE ME A IDEA TO HELP ME OUT

208. ## physics

An alpha particle approaches a uranium nucleus as 1e6 m/s what is the closest this particle will get to the nucleus how do you set this problem up? thanks!

209. ## math

How do I get a fraction to it's simplest form?

210. ## English

I am working on a descriptive paragraph about a time when I was sick. It's not a whole story. Just a paragraph on how you felt at the starting. I remember getting sick somwhere at the end of Feb. I remember catching the stomach flu~ vomiting; Friday night.

211. ## Poetry

How can I explain the first five lines in the poem "Leaning Into The Afternoons" by Pablo Neruda? Leaning into the afternoons, I cast my sad nets towards your oceanic eyes. There, in the highest blaze my solitude lengthens and flames; Its arms turning like

212. ## algebra

Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets,

213. ## chem

In order for a precipitation reaction to occur the product must be insoluble. However in an experiment we formed precipitates of two compounds, KNO3 and NaCl which are soluble? How did this occur? What was the forcing condition in each case?

214. ## science

the brakes are applied at the end of the 100s and the car comes to a stop within 20m ,slowing down at a constant rate .what is the acceleration?

215. ## map

How do you draw a net duagram for a group of cubes???!!!

y=2x squared -8x+7 what is this equation in vertex form?

217. ## Math

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

218. ## MATH!! Calculus inverses

if g(x) is the inverse of f(X), g(x)=f^-1(x) such that g(3)=5 and f'(5)=4 what is the value of g'(3)??? HELP i just need this one.

219. ## CALCULUS!!! tangent lines

If f(2)=4 and f'(2)=3, use the line tangent to the graph of f at x=2 to find a linear approximation for f(1.992) HELP! The only one I need, I need a Genius!!!!

221. ## Calculus, only two problems.

If g(x) is the inverse of f(x), g(x)=f^-1(x), such that g(3)=5 and f'(5)=4 what is the value of g'(3)????? :O 2. If g(x)is the inverse of f(x), g(x)=f^-1(x), such that f(3)=15,f(6)=3,f'(3)=-8,and f'(6)=-2. What is the value of g'(3)???????? Calculus--

222. ## stats

slot machines are now video games, with outcomes determined by random number generations. in the old days, slot machines were like this: you pull the lever to spin 3 wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops

I have to find the width of a river which is represented by a right trianle. The opposite side is labeled w and the adjacent side is 1oo ft. Theta is 54 degrees. Would my equation be opp = adjacent/cos(54)?

224. ## science with planets

What was the planet last to be discovered out of these? 1.Mars 2.Mercury 3.Neptune 4.Pluto 5.Saturn 6.Uranus 7.Venus

225. ## Physics

Under what conditions will a 0.0300 kg marble and a 3.00 kg rock have the same gravitational potential energy other than zero

226. ## Trig

If I have a triangle with the hypotenuse side as 7, and the opposite side as 3, how would I find the angle? (This is a right triangle.) ......III .....IIII .7..IIIII ...IIIIII..3 ..IIIIIII _IIIIIIII

227. ## math

five names for -73

228. ## easy cal Q

lim x--->a x^2+a^2/x+a I know this equals (a) but I don't know how to explain my answer.

229. ## scince

how much heat does the sun give yiu

230. ## English

I really hope you can check the following questions and statements. 1) Of which classes did the 14th century see the rise? 2) Which role did the church play in medieval times? 3) What was the planetary system like according to Ptolemy? 4) Who is Beowulf

231. ## math

The yearly production of a 5 foot tree is 25 oranges. A 16 foot tree produces 58 oranges. Firstly, I had to list the ordered pairs, which are (5,25) and (16,58)then used slope-point equation to find the number of fruits from 18 and 20 foot trees. The last

232. ## English

I am working on my paragraph right now, and I need another better word instead of got out. I want to say, I got out of my dream, but I want it to be more sophisticated. Thanks

233. ## math

what percent of 12 is 3? i got 0.36% is that the same as 36%

234. ## spanish

i do my homework in class.

235. ## human services

How does a human services worker integrate the use of mediation, or third party neutrality, when he or she also serves as an advocate for the client and is an employee of the agency?

236. ## algebra

Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets,

237. ## college

HOW DOES A PERSON AUTONOMY AFFECTS THEIR SENSE OF FREEDOM

238. ## science

the municipality of Windhoek supplies 2 million cubic meters of water per month to the city of Windhoek .if a household consumes about 30kilo-litres of water per month ,estimate the number of residents in Windhoek ,assuming that a household has five

239. ## math

Can some one help me with these two problems multiply and simplify by factoring ∜10000*∜100000 type exact answer, using radicals as needed 2) Rewrite with rational exponents (ã3mn)^3 the (mn) are included under the square root as well.

240. ## sentences

What's a sentences for culture?

241. ## Algebra

1/4(7+3g)=-g/8

242. ## Math

Find two functions f and g such that (f X g)(x) = h(x). ( There are many correct answers. My answers were f(x) = 4/5x and g(x) = 5x + 2 but this was wrong. I do not know how to do this.

243. ## Trig

I'm really having a hard time determining an equation for a pendulum problem. It has to be in the form H(t)=asin[b(t-c)]=d. I've already determined a=25, d=30 and b=pi/14 but I can't figure out how to get c (the phase shift). How do I figure out the phase

244. ## physics

What vibrates in the following types of wave motions (i) light waves. (ii) sound waves. (iii) x-rays.

245. ## science with planets

What is the planet that has faint rings and is SOMETIMES the farthest planet from the sun?

246. ## vocabulary

glue:stick::thorns:

247. ## Chem

I have a question on this question would I forgo the sqaure root on this on because there is no sqaure except on the products side which is 2HI? I am lost because I set up ICE then got to: 54=(4X-0.09)^2/x*x Kc=[HI]^2/[x][x] At a particular temperature, Kc

248. ## English

1. You can take the marker to the starting point. 2. You can put the marker on the staring point. 3. You can move the marker to the starting point. 4. You can put the marker on the word, Start. (At a dice game.... Are all the expressions grammatical?)

249. ## Science

Do guppies live in a herd, grove, alone, pairs, or colonies? Of what size? I have been trying to find this answer but its so broad and i need a little help. If you could also post the website where you found the information the would be great! thanks:)

250. ## microeconomics

Suppose that two people, Mary and John each live alone in an isolated region. They each have the same resources available, and they grow corn and raise pigs. If Mary devotes all her resources to growing corn, she can raise 200 pounds of corn per year. If

251. ## math

I really don't understand this question and I can't seem to be able to solve it. Can anyone help me? Write a composite number between 7 and 20.

what is heat

253. ## English

I forgot to include a few more sentences I'm not sure of. Thank you. 1) You mustn't modify or change (?) the marks on your school report 2) You mustn't fake (Or counterfeit) your parent's or teacher's signature on your school report or (how do you call a

2 8\2 ____ 2

255. ## 12

Can a ball have a volume and surface area that have the same numeric value (ignoring units)?

256. ## math

70% of 70 is A)1 B)10 C)1000 D)100 E)none i got 100

257. ## Phlosophy

I have a 3 page paper due...well, yesterday, for my philosophy class. I don't understand any of it though. The question for my essay is: What is the Principle of Alternate Possibilities (PAP)? Explain the crucial role the Principle has played in

258. ## Chemistry

How do I find the emperical formula of 16.9% Fe3+ 39.7% C2O42- 43.4% H2O

259. ## algebra

2. The equation D=1.2 square h gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a. Solve this equation for h. b. Long’s Peak in Rocky Mountain National Park, is 14,255 feet in elevation. How far can you see

260. ## math

Evaluate r+s/8 for r=20 and s = 20 20+20/8 40/8 answer is 5 is this correct?

262. ## math

(1/10 \ 1/2) * 3 + 1/5 for 1/10 \ 1/2 i got 1/5 but i don't know what to do with the rest 1/5 * 3 + 1/2= F)4/5 G)4/15 H)16/25 J)3 2/5 K)none of these

263. ## algebra

Find the equation for the line parallel to 2x+y=6 and passing through (2, 6). Justify your response.

g(x) = (3/2)^x+2 I need to find the intercepts. My teacher told me to press trace on my graphing calculator to find them. I got x = 0 and y=3 everything else is decimals so is my answer just (0,3)?

265. ## math

(1/10 \ 1/2) * 3 + 1/5 for 1/10 \ 1/2 i got 1/5 but i don't know what to do with the rest 1/5 * 3 + 1/2= F)4/5 G)4/15 H)16/25 J)3 2/5 K)none of these what do i do

266. ## math

what percent of 300 is 60 F)20% G)50% H)2% J)5% i think I'm just doing it wrong because i got (180) and then the 2 time i got (500) so do you mind telling me what Am doing wrong

267. ## To Ms. Sue

Ms. Sue, I have to ask for your opinion on this. Which introduction sounds better. I awakened from my dream, and found myself to be sweating. I awakened from my dream sweating. I awoke from my dream with sweaty skin. I awoke from my dream with a thudding

268. ## transformations

Hi I just got my correspondence back and the following question is wrong. Explain how the graph of f(x)=x^2-4x can be used to obtain the graph of y=g(x). Could you explain so I can see where I went so wrong. Thanks for your time.

269. ## Calculus Theorem! !!!????

i don't understand this, Show that if G(x) is an antiderivitive for f(X) and G(2)=-2 then G(4)=-7+((integral))top number 4 lower number 2 f(X)dx its so confusing.? HELP. Thanks!!

270. ## math

what is the perimeter of an rectangle if it's length is 40 units and it's width is half it's length?

271. ## math

What is the divisibility rule of 11

3x-6=6

273. ## world issues

which countries give money or military support to Syria?

274. ## Math

Does (3x+4)/(v-2) reduce to 3v-2?

what is the formula to find the area of a garden lot.

276. ## english

what is a communication climate?

277. ## Math

Find two functions f and g such that (f X g)(x) = h(x). ( There are many correct answers. My answers were f(x) = 4/5x and g(x) = 5x + 2 but this was wrong.

278. ## Math

What rate would it take to double an object valued currently at \$100 in 6 years? I would like to know the answer and the equation/steps taken to solve the problem.

281. ## Personal Finance

After a protracted legal case, Joe won a settlement that will pay him \$11,000 each year at the end of the year for the next ten years. If the market interest rates are currently 5%, exactly how much should the court invest today, assuming end of year

282. ## grant preposals

Distinguish between a project-wide evaluation plan and an objective-oriented evaluation plan.

-8

284. ## limits

use f'(x)=lim h-->0 f(x+h)-f(x)/h to find the limit: h-->0 sin^3,4(x+h)-sin^3,4x/h

285. ## sentences

what's a sentence for whistle?

286. ## algebra

help with week 8 word problems in mat116

Population: Patients at Toronto Hospitals(Population size-- 100,000) Topic: Quality of Service You are to conduct a survey on the above population to gather information upon the indicated topic. For this assignment, you must: 1.Describe a muti-stage

288. ## math

\how do you write 33/75 in a decimal form

289. ## math

13+[22-(7+3)] i got 16 A)25 B)21 C)31 D)47 E)none of these

290. ## math

5 4 2 - + - + - 9 9 9 F) 11 -- 27 G) 2 1 - 9 H) 1 1 - 9 j) 2 - 9 K)none of these i got 11 3 -- or 1 - 9 9

291. ## math

5 over 9 + 4 over 9 + 2 over 9 = i got 1 and 3 over 9

292. ## math

3 times a number is

293. ## calculus

d/dx of ln(t)/t i believe the answer is 1-ln(t)/(t)^2 but i just want to make sure.

294. ## us history

sequencing the louisiana purchase in order from a-j

295. ## us history

how many troops were in the regular army at the start of war of1812

296. ## math

how many seconds are there in 1 day?