# RAJ

Most popular questions and responses by RAJ
1. ## Chemistry

What is the ionic strength of 0.2 M Na2HPO4 in a solution?

2. ## Chemistry

PartA: What volume of 10.0M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? TrisHCl is a weak base and the molecular weight is 157.67 g/mol. I found the solution, it is 6.67 milliliters. The main question is:Part B: "The

3. ## rd. math

Pl find out hcf using division method 180,252,576

4. ## Chemistry

In a thermochemistry experiment the reaction of 0.0857 g of an unknown metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the volume of an ice/water mixture. Calculate the enthalpy of this reaction per 1 g of metal reacted. Needed data:

5. ## chemistry

You have to prepare a pH 5.00 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN. Which solutions would you use? HCOOH HCOONa CH3COOH CH3COONa HCN NaCN

6. ## chemistry

When excess solid Mg(OH)2 is shaken with 1.00 L of 1.2 M NH4Cl solution, the resulting saturated solution has pH = 9.30. Calculate the Ksp of Mg(OH)2 I am not sure where to even begin on this problem.

7. ## Chemistry

Draw the Lewis structures for BrO3- and ClO4- and indicate their correct number of additional resonance structures. I'm a little confused about this. For example, I've got the correct original form of BrO3- down. Where all 3 O atoms are single bonded to

8. ## Statistics

The percentage of adults who have been told at some point that they have hyptertension is 23.53%. If 10 adults are randomly selected, what is the probability that at least 8 have been told that they have hypertension?

9. ## math

Find two positive real numbers x and y such that they add to 120 and x^(2)y is as large as possible

10. ## Chemistry

0.658 g of potassium bromate and 0.562 g of silver nitrate are added to 388 mL water. Solid silver bromate is formed, dried, and weighed. What is the mass, in g, of the precipitated silver bromate? Assume silver bromate is completely insoluble. I've

11. ## algebra

The fifth term of an A.P exceeds twice the second term by 1.The tenth term exceeds twice the fourth term by 3. Find:1.the first term. 2.the common difference. 3.the sum of first twenty five terms.

12. ## Math

A body of 6 kg rest in limiting equilibrium onan inclined plane whose slope is 30° the plane is raised to a slope of 60 degree the forcw in kg weight around the plane required to support it is

13. ## science(physics)

A bullet of mass 100g moving with20m/sec .Strikes a wooden plank and peretrates up to 20cm.Calculate the resistance offered by the wooden plank.

14. ## statistics

2. At a local university, a sample of 49 evening students was selected in order to determine whether the average age of the evening students is significantly different from 21. The average age of the students in the sample was 23 years. The population

15. ## Chemistry

What is the chemical equation for the combustion reaction between methanol and air? CH4 + O2 ==> CO2 + H2O. All hydrocarbons produce CO2 and H2O when they are combusted in air. The above equation isn't balanced. I assume you can do that? If not, ask OR

Aunt Sally’s “New Orleans Most Famous Pralines” sells pralines costing \$1.10 each to make. If Aunt Sally’s wants a 35% markup based on selling price and produces 45 pralines with an anticipated 15% spoilage, what should each praline be sold for?

17. ## calculus

A cable runs along the wall from C to P at a cost of \$3 per meter, and straight from P to M at a cost of \$5 per meter. If M is 16 meters from the nearest point A on the wall where P lies, and A is 50 mters from C, find the distance from C to P such that

18. ## Math, Series

Given that 1/(y-x), 1/2y, and 1/y-z are consecutive terms of an arithmetic progression, prove that x,y, and z are consecutive terms of a geometric progression.

19. ## Maths

How many different selections of four letters from the 12 letters of the word REFRIGERATOR contain no Rs and two Es?

20. ## Maths

find two positive real numbers x and y such that their product is 800 and x+2y is as small as possible

21. ## Chemistry

If 1.000 kcal of heat is added to 1.700 L of oxygen in a cylinder at constant pressure of 1.00 atm, the volume increases to 2.100 L. Calculate the total energy change for this process.

22. ## Chemistry

For each of the pairs of bases below, choose the stronger base: (i) NH2- or NH3 (ii) ClO3- or ClO2- (iii) Cl3CCOO- or Cl2HCCOO- For i) I think it is NH2-, because it has a stronger ability to attract an H+ atom to become de-ionized. For ii) I don't know

23. ## Physics

A skier is pulled up a slope at constant speed. The tension in the wire pulls the skier with a force of 400N that acts at 40 degree to the slope. 1. Explain with reference to the forces acting on he skier why he travels at constant speed. 2.Describe two

24. ## fianance

can you check my answers if they are correct thank you 1.) A convertible bond is currently selling for \$945. It is convertible into 15 shares of common which presently sell for \$57 per share. What is the conversion premium? A. \$90 B. \$45 C. 57 shares D. 13

25. ## Physics

Define non-zero intercept?

26. ## Chemistry

Copper dissolves in nitric acid, producing copper (ll) nitrate. After reaction with sodium hydroxide and heating, copper nitrate changes to copper (ll) oxide. Calculate the percent yield of this process if 1.235 g of copper produced 1.452 g of copper

27. ## Chemistry

Calculate the end point pH, when 25 mL of 0.01 mol/L HCl solution reacts exactly with 25 mL of 0.1 mol/L NH4OH solution. NH3 Kb = 1.8 x 10^-5 This will be the pH of NH4Cl solution. NH4+ + HOH ==> NH3 + H3O^+ Ka = Kw/Kb = (NH3)(H3O^+)/(NH4^+). Solve for

28. ## Maths

find the number of ways of choosing a school team of 5 pupils from 6 boys and 8 girls if 3 of the boys are cousins are either on the team or all not in the team.

29. ## Chemistry 12

The original 10 ml (KIO3) solution is 0.020M is mixed with 10 mL of 0.0020M NaHSO3 which give a total volume of 20 mL. Calculate the concentration of KIO3 in the final mixture of the dilution.

30. ## Chemistry

What is [H3O+] in a solution obtained by dissolving 215 mL HCl(g), measured at 23 degrees C and 757 mmHg, in 4.30 L of aqueous solution?

31. ## Maths

A choir consists of 13 sapranos,12 altos,6 tenors, and 7 basses.A group consisting of 10 sapranos, 9 altos, 4 tenors and 7 basses is to be chosen from the choir. Q.The 4 tenors and 4 basses stand in a single line with all the tenors next to each other and

32. ## Maths

The point P is reflection of (-2,10) on the line 4x-3y=12. Find the coordinates of P.

33. ## Math

A small aeroplane has 14 seats for passengers. The seats are arranged in 4 rows of 3 seats and a back row of 2 seats . 12 passengers board the aeroplane. (i) How many possible seating arrangements are there for the 12 passengers? Give your answer correct

34. ## math

Find the height of a cuboid whose volume is 168 cubic metre and the area of the base is 28 square metre. The length of a reservoir is 2.5m. It's width is 2 m and its height is 4 m. If it is half-filled with water, find the volume of the water in the

35. ## Physics

A hockey puck travelling at 26 m/s [E 22* S] rebounds off the board at 21 m/s [E 22* N]. The puck is in contact with the board for 0.0025 seconds. Determine the average acceleration of the puck over the interval. average acceleration= change in

36. ## Chemistry

Calculate ∆H˚ for the following reaction using the given bond dissociation energies. CH4 (g) + 2O2 (g) --> CO2 (g) + 2H2O (g) Bond.......∆H˚ (kJ/mol) O-O........142 H-O.........459 C-H.........411 C=O........799 O=O........498 C-O.........358 ∆H˚

37. ## Physics

A 150m long train is moving with uniform velocity of 45km/hr.The time taken by the train to cross a bridge of length 850 meters is

38. ## Calc

let theta (in radians) be an acute angle in a right triangle, and let x and y, respectively, be the lenghts of the sides adjacent and opposite ?. suppose also that both x and y vary with time

39. ## Physics

Answer A skier is pulled up a slope at constant speed. The tension in the wire pulls the skier with a force of 400N that acts at 40 degree to the slope. 1. Explain with reference to the forces acting on he skier why he travels at constant speed. 2.Describe

40. ## Maths - Calculus

x^y=y^x ; then find dy/dx

41. ## Chemistry

Classify the following as: Weak or strong acid, weak or strong base, salt (from weak/strong acid and base). If appropriate, split the formula into its component ions. HNO3 So far, all I have is: HNO3 + H2O -> NO3^- + H3O^+ And I know HNO3 is a strong acid.

42. ## Chemistry

Use the Bronsted-Lowry definitions to identify the two conjugate acid-base pairs in the following acid-base reaction: H20 + H20 H30^+ + OH^- Let's see what you think on this after the previous post. Just remember, the acid is the one that HAS the H and the

43. ## physics

The figure below shows a plot of potential energy U versus position x of a 1.30 kg particle that can travel only along an x axis. (Nonconservative forces are not involved.) In the graphs, the potential energies are U1 = 10 J, U2 = 35 J, and U3 = 50 J.

44. ## Maths

Find the area of quadrilateral ABCD having vertices A(-1,5) , B(-2,6) , C(4,10) and D(3,5)

45. ## Maths

Nine cards, each of a different colour, are to be arranged in a line. The 9 cards include a pink card and a green card. Consider all possible choices of 3 cards from the 9 cards with the 3 cards being arranged in a line. Q.How many of the arrangements of 3

46. ## Maths

Permutation and combination A diagonal of a polygon is defined to be a line joining any two non-adjacent vertices. 1.Show that the number of diagonals in a 5 sided polygon is(5 2) -5. 2.how many diagonals are their in 6 sided polygon? 3.Show that the

47. ## Physics (Springs)

A spring-loaded toy uses a compressed spring to fire a marble out of a tube. A force of 220 N compresses the spring by 0.14 m. Calculate the elastic potential energy of the toy.

48. ## maths

a man gives 40% of his money to his children and 20% of the remaining to a trust. if he is still left with rs.9600.what did he originally have?

49. ## Maths

Pegs are to be placed in the four holes shown, one in each hole. The pegs come in different colours and pegs of the same colour are identical. Calculate how many different arrangements of coloured pegs in the four holes can be made using (i) 6 pegs, all of

50. ## English

Hi, If anyone has read Hamlet...I have to write an essay showing how Hamlet is a hypocrite or similar. I need 3 main points of proof. I only have one, which is that Hamlet says he loves Ophelia but hes the cause of her death and he shunned her. I need two

51. ## Maths

In a sector COD of a circle, centre O , in which angle COD =4/3 radians. The points A and B lie on the OD and OC respectively, and AB is an arc of a circle, centre O, of radius 7cm. Given that the area of the shaded region ABCD is 48cm^2. Find the

52. ## Maths

This question is about the motion of a firework rocket. A firework rocket is fired vertically upwards from the ground. It accelerates uniformly from rest with an acceleration of 8.0 for 5.0 s after which time the fuel of the rocket has all been used. 2

53. ## Maths

a/A class test consists of 4 Algebra questions,W ,X,Y and Z, and 3 Geometry questions,A,B,C and D.The teacher decides that the questions should be arranged in two sections.Algebra followed by Geometry,with questions in each section arranged in a random

54. ## Maths - A.P.

In an A.P. having 100 terms. Its first term is 3, M=5n and Sm/Sn does not depend on n then find second term.

55. ## english 101

1. Study the words Rowan uses in describing Miss Bessie. Which words have the most impact?

56. ## English

How is Hamlet a hypocrite towards Ophelia? I have one example, which is that he says he loves her but is the cause of her death because he rejects her and kills her father, which causes her madness and subsequent death. I need one more example, but I can't

57. ## Maths

9 cards each of different colors include a pink card and a green card. 1.How many different arrangements do not have the pink card next to the green card?

58. ## Maths

The graph of y=ax^2+bx+c is translated by the vector (4 5).The resulting graph is y=2x^2-13x+21.Find the values of a,b and c.

59. ## Physics

Please answer i am confused what to plot in y axis and in x axis. I am getting the gradient for this question in negative value.I have done the question many times. Time is taken for 10 oscillations. d/cm T1/SEC T2/SEC T3/SEC T D/T 1 25.0 14.68 14.57 14.81

60. ## Pre-Algebra

Solving it would give u x = -4...but I am not sure how you would graph that. You see, a linear inequality is an inequality that has one of the following four forms: Ax + By < C Ax + By > C Ax + By < C Ax + By > C PLZ!Somebody tell me the answer! PLZZZ!

61. ## Maths

1.Issam has 11 different CDs of which 6 are pop music , 3 are jazz and 2 are classical. Issam makes a selection of 2 pop music CDs, 2 jazz CDs and 1 classical CD. How many different selections can be made.Here the answer is 90 finalized by multiplying all.

62. ## Maths

Point A having coordinates (3,-7) lies on the curve y=f(X). State the coordinates of A when y=f(X) is transformed to y=f(2x-7)+1. The answer is (5,-6).But I didn't get 5.

63. ## Chemistry

Use the Bronsted-Lowry definitions to identify the two conjugate acid-base pairs in the following acid-base reaction: HCO3^- + S^2- HS^- + CO3^2- I got it. HCO3^- is the base in the pair with CO3^2-. S^2- is the acid in the pair with HS^-. Would you

64. ## Maths

the graph of curve y=f(x) has point P(2,1) lies on the curve. On the graph y=2f(x+3) label the image of the point P, giving its coordinates.

65. ## Maths

How to sketch the graph of y=f^-1(x)

66. ## CHemistry

45.00 mL of 1.55×10^−2 M HI(aq) is mixed with 85.00 mL of 1.08×10^−2 M KOH(aq). What is the pH of the solution?

67. ## Physics

What is tensile strength?

68. ## Maths

The graph of y=x^2-2x+1 is translated by the vector (2 3).The graph so obtained is reflected in the x-axis and finally it is stretched by a factor 2 parallel to y-axis.Find the equation of the final graph is the form y=ax^2+bx+c, where a,b and c are

69. ## Science

Please answer I have solved the numrical part. A skier is pulled up a slope at constant speed. The tension in the wire pulls the skier with a force of 400N that acts at 40 degree to the slope. 1. Explain with reference to the forces acting on he skier why

70. ## Physics

Time is taken for 10 oscillations. d/cm T1/SEC T2/SEC T3/SEC T D/T 1 25.0 14.68 14.57 14.81 2 30.0 13.90 14.32 14.41 3 35.0 13.28 13.50 13.82 4 40.0 14.00 14.22 14.15 5 45.0 13.37 13.22 13.32 6 50.0 12.97 12.97 12.94 Plot T against y axis and d/T against X

71. ## physics

to find the depth of the water surface in a well, a person drops a stone from the top of the well and simultaneously starts a stopwatch. The watch is stopped when the splash is heard, giving a reading of 3.65 s. The speed of sound is 340 m/s. Find the

72. ## Chemistry

If I2 reacted with hexane, how would we know, which carbons the Is go on? Would only one of the iodine go to the hexane and the other form HI, or would they both join and H2 is a by-product?

73. ## Physics

If the distance between two objects is tripled, by what factor will the gravitational force between them change?

74. ## Maths

How many 5 digits numbers less than 60000 and even can be formed using the digits 1,2,4,5,7 and 9

75. ## Chemistry

I posted before about designing a procedure to determine two unknowns (1 solid, 1 solution). The possible solutions were: NaCl, CaCl2, CuSO4, NaOH,Ba(OH)2, HCl, HNO3, or H2O. The reagents given are: NaOH, HCl, AgNO3, Zn metal, Na2SO4, and H2O. The

76. ## Maths

There is a curve with equation y=3/x, xis not equal 0. Sketch the curve with equation y=3/(x+2), xis not equal to -2, showing the coordinates of any point at which the curve crosses a coordinate axis.

77. ## Chemistry

Find percentage composition of K2SO4 in alum.

78. ## Chemistry - DrBob222

Alright, I've made a list of reactions that would produce precipatations. NaCl + Zn CaCl2 + NaOH CaCl2 + Zn CaCl2 + Na2SO4 CuSO4 + NaOH CuSO4 + Zn NaOH + AgNO3 NaOH + Zn BaOH2 + AgNO3 BaOH2 + Zn BaOH2 + Na2SO4 So this way I can figure if it is NaCl, CaCl2,

79. ## Physucs

A clerk pushes a filing cabinet of mass 22.0 kg accross the floor by exerting a horizontal force of magnitude 98 N. The magnitude of the force of kinetic friction acting on the cabinet is 87 N. The cabinet starts from rest. Use the law of conservation of

80. ## Maths

A squad of 20 boys, which includes 2 sets of twins , is available for selection for a cricket team of 11 players. Calculate the number of different teams that can be selected if one set of twins is selected but neither twin from the other set is selected.

81. ## Maths

There are twenty numbered balls in a bag.Two of the balls are numbered 0,six are numbered 1, five are numbered 2 and seven are numbered 3. Four of these balls are chosen at random,without replacement.Calculate the different number of ways this can be done

82. ## calculus

A sample poll of 100 voters revealed the following information concerning three candidates A, B, and C who were running for three offices. 10 voted in favor of both A and B, 35 voted in favor of A or B but not C, 25 voted in favor of B but not A or C, 65

83. ## Maths

Point A having coordintes (3,-7) lies on the curve y=f(x). State the coordinates of the image of A when the graph of y=f(x) is transformed to the graph of y=f(2x-7)+1 The answer is (5,-6).I tried but this one is different

84. ## Physics

4. a metal cylinder of height 4.5 cm and base area 24 cm2. metal cylinder 4.5 cm The density of the metal is 7900 kg m–3. (a) Show that the mass of the cylinder is 0.85 kg. (b) The cylinder is placed on a plank The plank is at an angle of 40° to the

85. ## Maths

f(x)=2x+1 Sketch in a single diagram the graphs of y=f(x) and y=f^-1(x), making clear relationship between the graphs.

86. ## Maths

Find the area of triangle having vertices A(-1,5) , B(-2,6) and C(3,5)

87. ## physics

An elevator cable can withstand a maximum tension of 1.83×104 N before breaking. The elevator has a mass of 420 kg and a maximum acceleration of 2.27 m/s2 . Engineering safety standards require that the cable tension never exceed two-thirds of the

88. ## calculus

Find the point on the surface z = 2x2+xy+3y2 where the tangent plane is parallel to the plane 8x-8y-z=5.

89. ## biology

In chickens, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). The mechanism for inheritance of the sex chromosomes is exactly the same as for X and Y sex chromosomes in other species. In chickens the character of

90. ## Maths

A squad of 20 boys, which includes 2 sets of twins , is available for selection for a cricket team of 11 players. Calculate the number of different teams that can be selected if one set of twins is selected but neither twin from the other set is selected.

91. ## Maths

There is a graph with maximum point (-2,5) and an asymptote y=1.Sketch the curve with equation y=f(x)+2? Does the asymptote change?

92. ## Maths

f(x)-x^2-4x+k for domain x>=p State the smallest value of p for which f is one-one.

93. ## calculus

Use Lagrange multipliers to find the maximum and minimum values of f(x,y)=x^2y+3y^2-y subject to the constraintx^2+y^2less than or equal to 10

94. ## Calculus

Assume that x>0 and y>0. If y=5sqrt{x+9} and dx/dt = 2, find dy/dt when x=7.

95. ## Calculus

A spherical balloon with a radius "r" inches has volume V(r)=(4/3)(pi)(r^3). Find the function that represents the amount of air required to inflate the balloon from a radius of "r" inches to a radius of r+1 inches.

96. ## Calculus

Find the inverse of each relation: y = (0.5)^(x+2) and y = 3log base 2 (x-3) + 2 For the first one I got y=log base 0.5 (x+2)...but the answer in the back of the textbook says that it is not x+2, but x-2. Can someone tell me why it would end up being x-2

97. ## Maths

Point A having coordintes (3,-7) lies on the curve y=f(x). State the coordinates of the image of A when the graph of y=f(x) is transformed to the graph of y=f(2x-7)+1

98. ## Maths

There is a graph with maximum point (-2,5) and an asymptote y=1.Sketch the curve with equation y=f(x)+2?

99. ## Series

Given that 1/(y-x), 1/2y, and 1/y-z are consecutive terms of an arithmetic progression, prove that x,y, and z are consecutive terms of a geometric progression.

100. ## science

Write an equation to show reaction of pop with water

1. 1
2. 2
3. 3
4. 4