# Raj

Most popular questions and responses by Raj-
## Chemistry

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

*asked on December 21, 2015* -
## 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

*asked on March 1, 2009* -
## rd. math

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

*asked on July 29, 2015* -
## 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:

*asked on December 1, 2007* -
## 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.

*asked on March 21, 2010* -
## 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

*asked on March 23, 2015* -
## 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?

*asked on October 9, 2008* -
## 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

*asked on September 28, 2008* -
## math

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

*asked on November 21, 2015* -
## 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

*asked on September 23, 2007* -
## 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.

*asked on July 5, 2017* -
## 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

*asked on July 19, 2017* -
## 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.

*asked on July 27, 2016* -
## 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

*asked on May 24, 2016* -
## 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

*asked on January 18, 2007* -
## 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

*asked on October 18, 2014* -
## Business Math

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?

*asked on February 8, 2019* -
## 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.

*asked on March 15, 2017* -
## Maths

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

*asked on August 18, 2019* -
## Maths

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

*asked on November 19, 2015* -
## 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.

*asked on October 8, 2007* -
## 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

*asked on November 20, 2007* -
## 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

*asked on August 31, 2019* -
## 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

*asked on January 5, 2013* -
## Physics

Define non-zero intercept?

*asked on August 26, 2019* -
## 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

*asked on October 28, 2007* -
## 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

*asked on May 31, 2007* -
## 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.

*asked on October 2, 2013* -
## 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.

*asked on August 20, 2019* -
## 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?

*asked on February 14, 2009* -
## 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

*asked on August 18, 2019* -
## 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

*asked on January 25, 2007* -
## 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

*asked on August 22, 2019* -
## 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

*asked on February 8, 2018* -
## 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

*asked on November 22, 2015* -
## Maths

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

*asked on August 29, 2019* -
## 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˚

*asked on November 9, 2011* -
## Maths - Calculus

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

*asked on April 13, 2019* -
## 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

*asked on October 19, 2011* -
## 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

*asked on May 26, 2007* -
## 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.

*asked on May 26, 2007* -
## 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

*asked on August 31, 2019* -
## 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

*asked on August 19, 2019* -
## 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

*asked on August 19, 2019* -
## 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?

*asked on November 18, 2016* -
## 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

*asked on March 3, 2007* -
## Maths

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

*asked on August 28, 2019* -
## 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.

*asked on November 1, 2018* -
## 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.

*asked on October 22, 2014* -
## 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

*asked on September 20, 2019* -
## 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

*asked on August 21, 2019* -
## 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

*asked on October 7, 2019* -
## 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.

*asked on April 16, 2019* -
## english 101

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

*asked on March 27, 2017* -
## 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

*asked on May 16, 2007* -
## 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

*asked on August 22, 2019* -
## 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.

*asked on October 5, 2019* -
## 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?

*asked on August 19, 2019* -
## 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

*asked on August 17, 2019* -
## 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!

*asked on November 28, 2006* -
## 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.

*asked on October 6, 2019* -
## 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.

*asked on October 6, 2019* -
## 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

*asked on May 26, 2007* -
## 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.

*asked on October 4, 2019* -
## Maths

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

*asked on September 9, 2019* -
## 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?

*asked on February 18, 2009* -
## Physics

What is tensile strength?

*asked on October 9, 2019* -
## 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

*asked on October 6, 2019* -
## 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

*asked on August 17, 2019* -
## 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

*asked on August 31, 2019* -
## 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

*asked on September 12, 2012* -
## 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?

*asked on February 11, 2008* -
## Physics

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

*asked on October 10, 2007* -
## Maths

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

*asked on October 6, 2019* -
## 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

*asked on November 11, 2007* -
## 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.

*asked on October 5, 2019* -
## Chemistry

Find percentage composition of K2SO4 in alum.

*asked on April 12, 2019* -
## 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,

*asked on November 11, 2007* -
## 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

*asked on November 30, 2006* -
## 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.

*asked on October 7, 2019* -
## 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

*asked on October 6, 2019* -
## 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

*asked on October 17, 2014* -
## 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

*asked on October 5, 2019* -
## 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.

*asked on September 9, 2019* -
## Maths

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

*asked on August 28, 2019* -
## calculus

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

*asked on October 17, 2014* -
## 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.

*asked on October 7, 2019* -
## 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?

*asked on October 5, 2019* -
## 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

*asked on September 29, 2019* -
## Maths

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

*asked on September 9, 2019* -
## 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

*asked on October 17, 2014* -
## 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

*asked on March 19, 2014* -
## Calculus

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

*asked on October 17, 2011* -
## 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.

*asked on September 22, 2007* -
## 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

*asked on October 5, 2019* -
## Maths

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

*asked on October 5, 2019* -
## 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.

*asked on March 15, 2017* -
## science

Write an equation to show reaction of pop with water

*asked on August 3, 2016* -
## 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

*asked on April 21, 2016* -
## physics

a ball is thrown at an angel of 40 degee above tghe horizontal.the ball clears the fence whis is 85 metre away.what is the inital velosity of the ball if we assume the ball is thrown at the same elevation of the fence

*asked on March 10, 2012*