Most popular questions and responses by rohit
  1. math

    if x3+ax2-bx+10 is divisible by x2-3x+2 .find the value of a and b

    asked on April 15, 2012
  2. Chemistry

    If 152 grams of ethane (C2H6) are reacted with 231 grams of oxygen gas, what is the excess reactant? 2C2H6 + 7O2(g) → 4CO2(g) + 6H2O(g)

    asked on August 8, 2016
  3. physics

    4N force applied on a body mass 20kg then calculate work done in 3sec?

    asked on July 3, 2016
  4. maths

    Divide 54 into two parts such that one part is 2/7 find the other

    asked on May 15, 2016
  5. maths

    Find the sum of all 3-digit positive numbers N that satisfy the condition that the digit sum of N is 3 times the digit sum of N+3. Details and assumptions The digit sum of a number is the sum of all its digits. For example, 1123 has a digit sum of

    asked on March 21, 2013
  6. science

    Suggest an experiment to compare the conductivity of electricity by iron, copper, aluminium and zinc. Perform the experiment and prepare a short report on the resu

    asked on June 15, 2016
  7. math

    in a Quadrilateral ABCD, AB=AD and CB=CD. Prove that- (1) AC bisects angle BAD (2) AC is perpendicular bisector of BD

    asked on December 25, 2015
  8. Dynamics

    A car travels around a horizontal circular track of radius 45m.If the car increases its speed at a constant rate of 1.2m/s2 starting from rest, determine the time needed for it to reach an acceleration of 1.4m/s2. What is its speed at this instant?

    asked on August 6, 2012
  9. Math

    A cylinder of curved surface area 1250m² is formed from a rectangular metallic sheet .Find the dimensions of the rectangular sheet I its length is double its breadth?

    asked on June 9, 2016
  10. Chemistry

    A reference solution is to be prepared with 5 PPM parabenzopyrene (molecular weight = 252). The quantity of parabenzopyrene required for preparing one litre 5 PPM solution is (A) 252 mg (B) 25.2 mg (C) 5 mg (D) 252 g

    asked on June 25, 2013
  11. Maths

    In a parallelogram the base and height are in the ratio of 5:2 ,if the area of parallelogram is 360 find base and height

    asked on March 5, 2017
  12. math

    Two trains are on the same track a distance 100 km apart heading towards one another, each at a speed of 50 km/h. A fly starting out at the front of one train, flies towards the other at a speed of 75 km/h. Upon reaching the other train, the fly turns

    asked on December 7, 2014
  13. physics

    When the ray of light travels from air to glass slab and strikes the surface of separation at 90 degree , then it ..........

    asked on March 14, 2016
  14. maths

    ABC is an acute triangle with \angle BCA = 35 ^\circ. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of \angle ABC (in degrees)?

    asked on March 30, 2013
  15. geometry

    Two circles which are not congruent touch externally. the sum of their area is 130¦Ðcm.square and distance between their centers is 14 cm. find radii of circles.

    asked on September 28, 2014
  16. computers

    what computers can do?what computers cannot do?what are the advantages and disadvantages of computers?what are the roles of computer in the society?

    asked on October 24, 2008
  17. science

    find the number of moles in 48 gm or carbon

    asked on December 13, 2018
  18. physics

    You must have seen actors in Hindi films jumping over huge gaps on horse backs and motor cycles. In this problem consider a daredevil motor cycle rider trying to cross a gap at a velocity of 100 km h–1. (Fig. 4.13). Let the angle of incline on either

    asked on July 31, 2018
  19. Chemistry

    25ml of 0 3 3. M HNO are mixed with 75ml of 0 3 4. M HNO . If the volumes are additive, the molarity of the final mixture would b

    asked on May 21, 2019
  20. math

    The sum of interior angels and the sum of exterior angles of polygon are in the ratio 9:2.find the sides of regular polygon.

    asked on December 18, 2015
  21. Physics

    A turn of radius 20m is banked for the vehicle going at a speed of 36km/h. If the coefficient of static friction between the road and the tyres is 0.4, what are the possible speeds of a vehicke so that it neither slip down nor skids up?

    asked on August 13, 2015
  22. astronomy

    The parallax of the red giant Betelguese is just barely measurable and has a value of about 0.005 arc seconds. What is its distance? Suppose the measurement is in error by + or -0.003 arc seconds. What limits can you set on its distance?

    asked on April 27, 2007
  23. scince maths

    1- What volume of hydrogen gas at 273 K and 1 atm pressure will consumed in obtaining 2.16 gm of elemental born(atomic mass=10.8)from the reduction of born trichloride by hydrogen: A- 44.8 lit B-22.4 lit C- 89.6 lit D-67.2 lit

    asked on May 27, 2008
  24. Math

    Triangle ABC is a right angled at A. AD is perpendicular to BC,AB=5cm,BC=13cm andAC=12cm. Find the area of triangle ABC.also find the length of AD

    asked on March 5, 2017
  25. geography

    are alps bigger or mountains?or wat's the difference between them? Alps are mountains in one specific geographic region. It is a historic name, there is no difference between the geography of "alps" and "mountains". need a definition of tall grass in

    asked on October 29, 2006
  26. maths

    Suppose z=a+bi, where a and b are integers and i is the imaginary unit. We are given that |1+iz|=|1−iz| and |z−(13+15i)|

    asked on April 3, 2013
  27. astronomy

    Arcturus is about half as hot as the Sun but is about 100 times more luminous. What is its radius campared to the sun. If Arcturus is half as hot, it radiates (1/2)^4 = 1/16 as much as the sun PER UNIT AREA. But since it radiates 100 times more totally, it

    asked on April 30, 2007
  28. maths

    The probability that Katarina will correctly solve a given Brilliant math problem is 1/8. The probability that Layla will solve the same problem correctly is 1/12. The probability that they will give the same incorrect numerical result is 1/1001. Suppose

    asked on April 1, 2013
  29. astronomy

    Arcturus is about half as hot as the Sun but is about 100 times more luminous. What is its radius campared to the sun.

    asked on April 27, 2007
  30. chemistry

    what increasing order of dipole moment among nitrobenzene methylbenzene phenol and toluene

    asked on April 6, 2016
  31. science

    When the ray of light travels from air to glass slab and strikes the surface of separation at 90 degree , then it ..........

    asked on March 14, 2016
  32. maths

    there are 20 apples and 15 oranges in a bin.if some apples are removed from the bin so that the probability of randomly drawing an apple becomes 2/ many apples must be removed from the bin

    asked on November 16, 2015
  33. physics

    Earthquakes are motions of the earth's crust. Essentially, they are big sound waves that travel through the earth. There are two types of waves. The first type is called a longitudinal or P wave, where the earth compresses in the same direction as the wave

    asked on May 9, 2013
  34. dav

    determine the concentrated of mohrs salt solution with the help of supplied n/10 kmno4 solution preparred?

    asked on May 4, 2011
  35. math

    The ratio of boys and girls in a class is 5:3 if 20 % of the boys and 60 % of girls have passed in first class what percentage of the class is in first class?

    asked on February 16, 2016
  36. maths

    Find the number of positive integers

    asked on April 12, 2013
  37. Economics

    what it meant by equilibrium in economics?how equilibirum attained? The following site has an ok defintion. (I cannot post the site: instead google economics, equilibrium, definition) Market equilibrium occurs when buyers and sellers, each acting in their

    asked on April 26, 2007
  38. Math quiz

    Proof that half of 9 is 4..'s proove instead of proof need a clue?

    asked on September 27, 2006
  39. Chemistry

    Calculate the standard internal energy change for the formation of water at 298K. The standard enthalpy of formation of water at 298K is - 285.8 KJ/mol.

    asked on March 25, 2016
  40. maths

    Score of Janet in Maths is 25 more than two-third of her score in English. If she scores x marks in English, what is her score in Maths ?

    asked on November 29, 2015
  41. science

    Which of the following is a example of a irriversible change. a)Disssolve salt in water b)Freezing water C)Mixing water-colour Which do you think you can't separate? Can you separate salt after it is dissolved in water? I think I could evaporate the water

    asked on April 21, 2007
  42. maths

    As x,y,z ranges over all possible real numbers, what is the minimum value of 3x^2+12y^2+27z^2−4xy−12yz−6xz−8y−24z+100?

    asked on April 13, 2013
  43. physics

    Two parallel wires carry 1-A currents in unknown directions. The distance between the wires is 10-cm. What is the magnitude of the magnetic field B in Teslas at a point P located 6-cm away from the axis of one of the wires and 8-cm away from the axis of

    asked on March 30, 2013
  44. calculus

    A moving dot P departs from O at an initial speed of 6 m/s in the east direction and accelerates at 2 m/s^2 in the east direction. 2 seconds after P's departure, dot Q departs from O to chase down P at a constant speed of k m/s in the east direction. What

    asked on March 21, 2013
  45. Maths

    'a' and 'b'are integers and (a, b) = 2. Solve the following two equations: (a+b)^2 = 25a 18(a^4) + (b^4) = 41a(b^2) Can't get it, help please?

    asked on January 4, 2011
  46. geography

    whr do cattles and sheep live like in high altitudes or middle or low altitudes? Cattle need food, water, and a temperature range that does not cook, nor freeze them. So if you choose to examine an altitude, check to see if those are available. If so,

    asked on October 29, 2006
  47. math

    For what value of 'k' the points ( -k + 1, 2k), (k, 2 - 2k) and ( - 4 - k, 6 - 2k) are collinear.

    asked on April 15, 2018
  48. maths

    5 geometric mean betweem 16 and 1/4

    asked on March 26, 2017
  49. math

    a circular pizza is cut along four diameters into eight identical sectors. If the total perimeter if each sector is 10 inches what is area of the whole pizza? express answer as a decimal to nearest tenth

    asked on January 13, 2017
  50. maths

    write numeral for thirty seven crore thirteen thousand nine hundred forty eight

    asked on June 17, 2016
  51. math

    draw a square on the graph paper whose each side of the length 5 centimetre and then make partition of the square into 25 small squares as soon in figure 1.1 each square is small square have its height and length 1 centimetre

    asked on July 23, 2015
  52. maths

    Find the smallest number N such that: The number of divisors of N is A. The number of divisors of A is B. The number of divisors of B is C. The number of divisors of C is 3.

    asked on June 5, 2013
  53. maths

    On children's day, a teacher brought 63 erasers and 147 sweets to distribute out completely to her class. Each student receives the same number of erasers as each other, and the same number of sweets as each other. What is the most number of students in

    asked on April 18, 2013
  54. physics

    You and your friend, both of mass 70 kg, are playing catch with a frisbee on frictionless ice. Initially, you are both at rest. You throw a 0.175 kg frisbee at 10 m/s horizontally at your friend, who catches it. After they catch the frisbee, what is the

    asked on April 1, 2013
  55. maths

    Let f(x)=x^2−1. How many distinct real roots are there to f(f(f(x)))=0?

    asked on April 1, 2013
  56. maths

    What is the largest possible integer that can be chosen as one of five distinct positive integers whose average is 10? Details and assumptions The elements of a set are distinct, if no two of them are the same.

    asked on April 1, 2013
  57. physics

    A current I=1A flows along a thin-walled cylinder of radius R=4cm. What pressure in Pascals do the walls of the cylinder experience? Assume that the current is uniformly distributed. Bonus thing to think about: Is this pressure directed inwards or

    asked on March 30, 2013
  58. physics

    The sun goes around the center of our galaxy once every 250 million years. The sun is also 2.55×10^20 m from the center of our galaxy. What is the acceleration of our sun towards the center of the galaxy in m/s^2?

    asked on March 21, 2013
  59. calculus

    What is the slope of the line tangent to the quadratic f(x)=4x^2−3x+6 at x=7?

    asked on March 21, 2013
  60. astronomy

    The parallax of the red giant Betelguese is just barely measurable and has a value of about 0.005 arc seconds. What is its distance? Suppose the measurement is in error by + or -0.003 arc seconds. What limits can you set on its distance? 1/0.005 = 200

    asked on April 30, 2007
  61. uni of huddersfield

    An electron (m = 9 x 10-31 kg) leaves the cathode of a radio tube with zero initial velocity and travels in a straight line to the anode, which is 1 cm away. It reaches the anode with a velocity of 6 x 106 m s-1 i)calculate the acceleration and the force ?

    asked on April 29, 2017
  62. chauhan

    sinx/1 cosx sinx/1-cosx=4 ,x lies in 1st quadrant then value of x is

    asked on January 10, 2017
  63. Spga

    if the angle of elevation of the sun is change from 45° to 60° then the length of shadow of the pole is deceased by 10 cm then height of the pole is

    asked on December 2, 2015
  64. math


    asked on October 27, 2013
  65. maths

    Determine 208/207+208/207×206/205+208/207×206/205×204/203+…

    asked on June 5, 2013
  66. maths

    How many functions f from the reals to the reals are there, such that f(f(x))=x^2−2? Details and assumptions f need not be a polynomial. f need not even be continuous.

    asked on May 21, 2013
  67. maths

    How many positive integers n are there such that 10^n≤n^10?

    asked on May 16, 2013
  68. maths

    What is the smallest positive integer with exactly 12 (positive) divisors?

    asked on May 16, 2013
  69. math

    As θ ranges over all real values, what is the maximum value of (14sinθ+5cosθ)^2

    asked on May 3, 2013
  70. maths

    What is the sum of all integer values of n such that 3n+15/(n−1)(n−5) is also an integer

    asked on April 10, 2013
  71. maths

    Three coins are randomly placed into different positions on a 4×10 grid. The probability that no two coins are in the same row or column can be expressed as ab where a and b are coprime positive integers. What is the probability of a+b?

    asked on April 1, 2013
  72. maths

    x,y and z are positive reals. What is the maximum value of ((x+y+z)^3−x^3−y^3−z^3)^2/(x^2+y^2+z^2)^3−x^6−y^6−z^6

    asked on April 1, 2013
  73. maths

    How many integers appear in both of the following arithmetic progressions: A1:2,9,16,……,2+(1000−1)×7 A2:3,12,…,21,…,3+(1000−1)×9 Details and assumptions Since 2 appears in A1 but not in A2, it does not appear in both of the arithmetic

    asked on March 21, 2013
  74. Math

    integrate (sin^8 x - cos^8 x)/(1 - 2sin^2 x * cos^2 x) w.r.t. x

    asked on January 2, 2011
  75. Math

    Proove that half of 9 is 4...i know the answer i am just chking whether u all know the answer or not..;P if u cut IX in halves(horizontally)...u'll get IV n=56 if n=11

    asked on October 4, 2006
  76. maths

    What is the smallest positive common difference of a 6-term arithmetic progression consisting entirely of (positive) prime numbers?

    asked on March 21, 2013
  77. math

    underoot 2x square +3x + underoot 2 by alpha into beta method.

    asked on May 3, 2012
  1. math

    Actually you need to find series that means sum of the sequence.. That is formula of Sn=? By using Tn=Sn-S(n-1)

    posted on July 4, 2019
  2. Physics

    It is 100 percent correct answer

    posted on April 5, 2019
  3. math


    posted on February 11, 2018
  4. math


    posted on February 11, 2018
  5. math

    Answer is too hard

    posted on January 29, 2018
  6. maths


    posted on March 5, 2017
  7. Math

    2+3 =5

    posted on January 11, 2017
  8. physics

    the two charges of magnitude 1rc and 2rc are separated by 10cm from each other at what point on the line joining the two charges is the electric field strength zero?

    posted on November 3, 2016
  9. phsics


    posted on October 18, 2016
  10. maths

    Sorry I don't know

    posted on May 15, 2016
  11. math


    posted on January 16, 2016
  12. Citizens

    the rights and responsibilits of citizens

    posted on January 14, 2016
  13. general maths


    posted on January 6, 2016
  14. geometry

    triangle ABC have angle ABC 90 degree. therefore the triangle ABC is right angled triangle. Therefore, In triangle ABC, by phyathagoras theorem, AC ¡Á AC =AB¡ÁAB BC ¡ÁBC AC ¡Á AC = 5¡Á5 12¡Á12 = 25 144 =169 Therefore, AC =13

    posted on September 28, 2014

    hey have u got this@Anonymous

    posted on November 10, 2013
  16. Math

    evaluate r. if12Pr=1320

    posted on August 30, 2013
  17. Math

    evaluate r. 12Pr=1320

    posted on August 30, 2013

    hf=Hi + Vsin45*t - 4.9 t^2 (v sin 45)t = 1.05 + 4.905 t^2 ___ (1) (v cos 45)t = 10 ___ (2) (2)/(1): 10 tan 45 = 1.05 + 4.905 t^2 Solve for t, t = 1.35 s Substitute t in (2), (v cos 45)1.35 = 10 v = 10.47 m s^-1

    posted on July 16, 2013
  19. algebra!!!! please help me!!!!

    as we have to chose positive odd integers sp we cant choose maximum big numbers close to 1 its choose w=3 x=3 then y=5 z=7 then answer is minimum is 1/45 or 1+45=46

    posted on June 16, 2013
  20. math

    then wats the answer

    posted on June 15, 2013
  21. pls heeelp math

    answer is 6/11 or 11+6= 17

    posted on June 8, 2013
  22. maths

    419.....go and get points

    posted on June 6, 2013
  23. Geometry and combiantorics.

    yes randy morico is correct

    posted on June 5, 2013