Most popular questions and responses by mahesh
  1. friction

    A 40 kg slab rests on a friction less floor.a 10 kg block rests on top of the slab.the coefficient kinetic friction between the block and the slab is 0.40.a horizontal force of 100N is applied on the 10 kg block.find the resulting acceleration of the slab.

    asked on September 28, 2014
  2. maths

    a train of length 100m runs at a speed of 120km/hr from north to south. another train of length 150m travels with a speed of 80 km/hr from south to north. what is the time required to cross each other ?

    asked on May 29, 2017
  3. maths

    Prove that max & min values of asinx+bcosx are = +/- (a^2+b^2)^1/2

    asked on July 12, 2013
  4. math

    A man spend 1/3 of his income on food, of the rest 1/4 on bills and 1/5 on miscellaneous things. Finally he left with Rs.1760. Find his income? a)4200 b)4600 c)4800) d)5200

    asked on July 31, 2015
  5. maths

    A freight train leaves a station traveling at 32 km/h. Two hours later, a passenger train leaves the same station traveling in the same direction at 52 km/h. How long does it takes the passenger train to catch up to the freight train?

    asked on May 31, 2017
  6. math

    Find the orthogonal trajectories of family of the circle x2+y2=a2 where a is a parameter

    asked on July 12, 2016
  7. Chemistry

    Calculate the entropy change accompanying conversion of 1 mole of ice at 273 K and 1 atm pressure into steam at 373 K and 1 atm pressure, given that at 273 K, the molar heat of fusion of ice is 6 kJ/mol and at 373 K, the molar heat of vapourization of

    asked on February 26, 2016
  8. math

    . A boat is travelling on a bearing of 25° east of north at a speed of 5 knots (a knot is 1.852 km/h). After travelling for 3 hours, the boat heading is changed to 180° and it travels for a further 2 hours at 5 knots. What is the boat’s bearing from

    asked on October 18, 2011
  9. maths

    Find max and min values of y=sinx sin2x

    asked on July 11, 2013
  10. maths

    which of the following fraction is greater than 3/4 and less than 5/6. 1/2 , 2/3 ,4/5 , 9/10.

    asked on May 9, 2017
  11. maths

    the value of K+L/K-L , if K/L = 7 ?

    asked on May 9, 2017
  12. vskd

    Maths If one third of the bucket can be filled in 3 min,how many min it take to fill whole bucket

    asked on October 22, 2015
  1. maths

    sum of the four angles =(4-2) sum of the two angle =360-130=230 so, second angle = 180/2=65 degree second angle = 210/2=115 degree

    posted on July 27, 2018
  2. math

    1. B. 3/7 = 3*6/7*6 = 18/42. 2. D.18/30 = 6/10 = 6*10/10*10 =60/100

    posted on May 31, 2017
  3. English


    posted on March 13, 2016
  4. English


    posted on March 13, 2016
  5. algebra

    Sorry. I wanted it to be (1-6x)^3-3x6x(1-6x)

    posted on July 17, 2013
  6. math

    1hr10min=1+10/60=1+1/6=7/6hr Distance=48x7/6=56miles

    posted on July 17, 2013
  7. math.

    Distance covered in 4 hrs=4y Return distance=2x4y=8y and speed=5y Hence time of return trip=8y/5y=1.6hr Halt=1hr Total time=4+1+1.6=6.6hrs

    posted on July 17, 2013
  8. math

    Relative velocity=45+55=100mph Time taken to cover the total distance=150/100=1.5 hr i.e. 1hr 30min Meeting time is 2:15+1:30=3:45pm

    posted on July 17, 2013
  9. math

    Total money=x. Spent in I store=(x/2)+20 Remaining amt=x-[(x/2)+20]=(x/2)-20 Spent in II store=1/2[(x/2)-20]+20 =(x/4)+10 Total expenditure is x x=(x/2)+20+(x/4)+10 Or x=(3x/4)+30 Or x-3x/4=30 x/4=30 or x=120. Check: Spent in I store =60+20=80.

    posted on July 17, 2013
  10. algebra

    Please read second expression as 3(8x^2+14x+5)

    posted on July 17, 2013
  11. algebra

    24x^2+42x+15=3(8x^2+14+5) =3(8x^2+10x+4x+5) 3[2x(4x+5)+1(4x+5)] =3(4x+5)(2x+1)

    posted on July 17, 2013
  12. algebra

    (300)^1/2 /6^1/2=(300/6)^1/2 =50^1/2=7.07

    posted on July 17, 2013
  13. math

    (-16)^-2/3=- 1/(16)^2/3=-1/(16^2)^1/3 =-1/256^1/3=-1/6.35=-0.157

    posted on July 17, 2013
  14. math

    In 1.75 hrs it fills 100% In 1 hr it will fill 100/1.75=57.14%

    posted on July 17, 2013
  15. math

    Time for going upwqards=7/2=3.5 hrs Time for coming back=7/3.5=2 hrs Total 3.5+2=5.5 i.e. 5 1/2 hrs

    posted on July 17, 2013
  16. algebra

    -216x^3+1=1^3-(6x)^3 =(1-x)^3-3x(1-x)

    posted on July 17, 2013
  17. Math Ratios

    Force is inversely proportional to square of distance between bodies, hence F/3.75x10^-5=18^2/52^2 F=(18^2x3.75x10^-5)/52^2 =0.46x10^-5 dynes

    posted on July 16, 2013
  18. Math

    PS: s=11.47 which has appeared as 121.47 at one place in 4th line.

    posted on July 16, 2013
  19. Math

    v=u-gt or 0=15-9.81t since final velocity is 0 and ball is going against gravity. Thus t=1.53 sec. s=ut-.5gt^2=15-.5x9.81x(1.53)^2 s=22.95-11.48=121.47 which is the height the ball will go. From there it falls freely for a height of 11.47+1=12.47 ft.

    posted on July 16, 2013
  20. algebra

    No. of $5=bills a, $10 bill=b and $20 bill=c Then a+b+c=35 5a+10b+20c=370, and b+c=a+7. Substituting value of b+c in first eq., a+(a+7)=35 or 2a=28 or a=14 and b+c=35-14=21. Substituting value of a in second eq., 14x5+10b+20c=370 or 10b+20c=370-70 Or

    posted on July 16, 2013
  21. math

    If house costs x and lot costs y then x+y=86000, and x=6y+2000 or x-6y=2000. Subtracting second eq. from first we get 6y+y=86000-2000 or 7y=84000 or y=12000. Thus lot costs $12000 House costs 86000-12000=$74000.

    posted on July 16, 2013
  22. MATH

    If cos^-1x=A then cosA=x and if (cosx)^-1=A then A=1/cosx

    posted on July 16, 2013
  23. math

    PS: There is slight typo. Please readt first line as 'Kath is' and third line as 2x+10.

    posted on July 16, 2013
  24. math

    If the number is x, then 3x-8 is=or greater than 2x. Agnus has x bones and Ignatz has x+5. Then x+x+5=27 or 2x=27-5=22 Or x=11. Ignatz has 11+5=16. Kathy mis x and John is x+10 Then x+x+10 is greater than 60 Or 2x+10is greater than 60 Or 2x 10 is greater

    posted on July 16, 2013
  25. algebra

    9.95x+11.5y=305.05 x+y=29 9.95x+9.95y=29*9.95 Or (11.50-9.95)y=305.05-288.55 1.55y=16.5 y=16.5/1.55=10.6, say 11 yellow shirts 29-11=18 white shirts 11*11.5+18*9.95=305.6 OK.

    posted on July 15, 2013
  26. algebra

    Lemon juice=x Oil=2x x+2x=3x=36

    posted on July 15, 2013
  27. maths

    If one train has a velocity of V km/h, the other one will have velocity V+5 km/h approaching the first train. Therefore Relative velocity will be V+V+5=2V+5 km/h. Distance travelled by them in 2 hrs is 340-30=310km which is =2(2V+5) Thus 4V+10=310 or

    posted on July 15, 2013
  28. physics

    v=u+ft or 30=10+2t t=(30-20)/2=10 secs.

    posted on July 15, 2013
  29. math

    Let it be x yrs ago, when Lisa was 15-x and her father was 40-x. Then- 40-x=6(15-x) or 40-x=90-6x Or 6x-x=90-40 or 5x=50 thus x=5. Let Bob be x yrs and Joel be 3x. Then (x+7)+(3x+7)=58 or 4x+14=85 Or 4x=44 hence x=11. Thus Bob is 11 and Joel is 33. After 7

    posted on July 15, 2013
  30. Algebra

    Yes please. 10 cubed is 1000 and cuberoot of q^36=q^(36/3)=q^12

    posted on July 15, 2013
  31. math

    Let present age of Kristen be x and of Daniel be y.Then after 1 year, x+1=4(y+1)or x-4y=3.....Eq.1 After 10 yrs from then, ages will be (x+1)+10=2[(y+1)+10] Or x+11=2y+22 Or x-2y=11 .....Eq.2. Subtract eq. 1 from eq.2 and solve. We get y=4 and x=19. Check:

    posted on July 15, 2013
  32. math

    Let the integers be x and x/4.Then x/4+12=x-3 or x+48=4x-12 by multiplying both sides by 4. Or -3x=-20-48 or x=20 which is the larger integer. Smaller one is then 20/4=5. Check:5+12=17=20-3 OK.

    posted on July 15, 2013
  33. physics

    v=u+at or 220/4=200/2+a*1 55=50+a or a=5m/s^2 Again, v=55+5*1=60m/sec at the start of 7th second.

    posted on July 15, 2013
  34. algebra

    Please see your third line: It should be 4y-3y=20-5 or y=15, by subtracting first equation from second. Now x+3*15=5 Or x=5-45=-40. Check:-40+4*15=20 by putting values in second equation. This -40=15-60=-40 OK.

    posted on July 15, 2013
  35. physics

    Components of a force P due North-West acting at an angle A from North will be PcosA and PsinA in North and West directions respectively and should be equal in magnitude to the force acting on the object. Thus PcosA=83.4 and PsinA=47.2. Therefore

    posted on July 12, 2013
  36. physics

    Heat released by 0.5 kg silver=heat gained by 1 kg water upto final temp T. Or 0.5(2.4x100)(150-T)=1(4.18x1000)(T-5) Or 1.2(150-T)=41.8(T-5) Or 180-1.2T=41.8T-209 Or 43T=389 Or T=9.05 deg Celsius

    posted on July 12, 2013
  37. Physics

    t^2=2x3.14x0.47/a Or, a=6.28x0.47/1.43^2=0.43 m/sec^2

    posted on July 12, 2013
  38. Geometry

    Square has all sides equal hence 2x-5=x+8 or 2x-x=8+5 (by subtracting x and adding 5 on both sides) Thus x=13 inches. Check: 2x13-5=8+13 or 26-5=21.

    posted on July 12, 2013
  39. physics

    Weight is mass m times acceleration due to gravity g, which is given by g=GMm/R^2 where M and R are mass & radius of Earth and G is Universal Gravitational Constant. For new planet, g`=G(0.1Mm/(R/2)^2 =0.1GMm/R^2/4 =GMm(0.1x4)/R^2=0.4GMm/R^2 Hence

    posted on July 12, 2013
  40. physics

    what happend 2 ur mobile? i was trying 2 call u but i got this msg: welcome 2 D jungle network,D monkey u r tring 2 call is on tree plz try later.

    posted on July 19, 2008