1. Math- URGENT PLEASE

    Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures?
  2. Physics

    Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures?
  3. Math

    Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures? Thank You!
  4. Significant Figures

    Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures?
  5. Physics

    A capacitor has a charge of 5 µC when charged by a potential difference of 1.5 V. What is the capacitance of the capacitor? 3.3x10^-6 F 3.3x10^6 F 7.5x10^-6 F 0.3x10^6 F I would think the answer is 3.3X10^F, or choice B
  6. science

    Suppose a rocket ship in deep space moves with constant acceleration equal to 9.8m/s^2., which gives the illusion of normal gravity duing flight. a)If it starts from rest, how long will it take to acquire a speed one-tenth that of light, which travels at
  7. chemistry

    Calculate the molar solubility of MX2, if the Ksp=3.3x10^-8 i already asked this but im confused about one of the steps. Ksp = (x)(2x)^2 = 4x^3 = 3.3X10^-8 x = solubility = 0.00202M. but i don't understand do i substitute the x in 4x^3 3.3X10^-8 and then
  8. Chemistry

    If the solubility of Ag2CO3 is 1.3x10^-4 mol/L, what is its Ksp? (the answer is said to be 8.8x10^-12) Ag2CO3(s) -----> 2 Ag+ (ag) + CO3 2- Ksp= [Ag+]^2 [CO3^2-] = [1.3x10^-4]^2[1.3x10^-4] =2.197x10^-12 thats what I did, but I found that if you first
  9. Math

    Name the property that justifies each step. [(2x100)+(3x10)]+[(1x100)+(5x10)] = (2x100)=[(3x10)+(1x100)]+(5x10) I think this is Commutative = (2x100)+[(1x100)+(3x10)]+(5x10) I think this is Distributive property =[(2x100)+(1x100)]+[(3x10)+(5x10)] I think
  10. Chemistry

    Find the frequency if given energy 6.3x10^-19 Do I use the formula E=hf? 6.3x10^-19=6.626x10^-34(f) Then do I divide E and H?
  11. Physics

    Find the speed of light in flint glass if the index of refraction is n=1.66. How much slower in percent of speed of light in a vacuum c does the light move in each of this medium? v=c/n v=3x10^8m/s/1.66 =1.8x10^8m/s For the percent of speed of light in a
  12. math

    Find x 1) 6log(down)10 x=1.6 2) e^-4x=1.943 3) 1.3x10^-4 x=4.7/x -6.3x10^-3 4) 6lnx=1.6 5) x^2¡Ñ23y^2 = 1.78x10^32¡Ñz please help I really can't solve this problem.
  13. maths

    Q:if x= 2x10^5 and y=3x10^-3 correct to one significant figure,find the greatest and least possible value of: i)x/y
  14. maths

    Q:if x= 2x10^5 and y=3x10^-3 correct to one significant figure,find the greatest and least possible value of: i)x/y
  15. Physics

    A motorcycle with an initial velocity of 7.99x10^0 m/s accelerates for a total of 3.3x10^0 seconds at a rate of 1.51x10^0 m/s2. What is it's velocity, to two significant figures? can anyone show the calculations for this
  16. physics

    when lightning strikes you can see it at a speed of 3x10^8m/s. But you hear thunder at about 340m/s in 70 degrees air temperature. a) If you are a mile away from lightning, how long of a delay is there? b) if the delay between the lightning and thunder
  17. chem

    The Ksp of PbI2 is 8.7x10^-9. Find the solubility of lead(II) iodide on mol/L. a. 1.3x10^-3 b. 9.3x10^-9 c. 6.6x10^-5 d. 1.6x10^-3
  18. CHEMISTRY!!!=0

    Determine pH of each solution: 0.20 M KI i don't know how you know if you use.. K+H2O->KOH + H or... I- +H2O--> HIO +H Im thinking this one... I- + H2O --> HIO + H 0.20M--------------------0-----------0 0.20-x------------------x-------------x
  19. HELPP !!

    Copper(I) ions in aqueous solution react with NH3 according to Cu^+ + 2NH3 --> Cu(NH3)2^+ Kf=6.3x10^10 Calculate the solubility (in g/L) of CuBr (Ksp=6.3x10^-9) in 0.81 M NH3.
  20. Chemistry

    The speed of light is = 3x10^8 m/s. How long w ill it take to reach Pluto, 278,000,000,000 km away? This is how I solved it: 3x10^8m/s x 1km/1000m x 1/2.78x10^11 km I keep getting the wrong answer. I am not sure if this is how you set this conversion??
  21. physics

    four particles with charges +5x10^-6C, +3x10^-6, +3x10^-6C, and +5x10^-6C are placed at the corners of a 2m x 2m square. (a)determine the electric potential at the center of the square, assuming zero potential at infinity. (answer:3.83x10^4V)(b) If one of
  22. Physics

    An object with a mass of (2.844x10^1) kg is subjected to a force of (3.964x10^3) N directed at an angle of (6.374x10^1) degrees from the x axis. A second force of (1.3x10^2) N acting in the negative X directions is also applied to the object. To two
  23. Chemistry

    find the ph of 0.100M NaC2H3O2 solution. do i just write an equation and solve for x NaC2H3O2 +H2O= Na2O + HC2H3O2- 0.100 0 0 so x^2/0.100-x =1.8 X10^-5 x=1.3X10^-3 then do ph=-log(1.3X10-3) ph=2.9 is this right?
  24. Chemistry

    find the ph of 0.100M NaC2H3O2 solution. do i just write an equation and solve for x NaC2H3O2 +H2O= Na2O + HC2H3O2- 0.100 0 0 so x^2/0.100-x =1.8 X10^-5 x=1.3X10^-3 then do ph=-log(1.3X10-3) ph=2.9 is this right?
  25. Science

    "a drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of 40cm2. Assume that the oil film has a uniform thickness equal to the diameter of an oil molecule. Calculate the
  26. Math

    1. Is it more appropriate to use scientific notation for approximates or exact numbers? why? 2. In one plantation, there are 2700 young trees correct to 2 significant figures. In the other there are 830 full grown trees, correct to 2 significant figures.
  27. Significant Figures

    I'm having a hard time with significant figures. Any help would be appreciated. The first one is 0.0000000502. I put that it has three significant figures. Is this correct? The other numbers I haven't a clue about are: 5.52 299,792,458 206,265 I get the
  28. Math

    [Note: I did the first half of this question by myself and got it correct. But I got the second half wrong] Question: How much work does the electric field do in moving a proton from a point with a potential of +160 V to a point where it is -45 V ? Express
  29. algebra

    Check my answer? What is the order of the numbers from least to greatest? A= 6.2x10^5, B= 1.1x10^-3, C= 4.3x10^-3, D= 5.2x10^-5 I think it's D,B,C,A (5.2x10^-5, 1.1x10^-3, 4.3x10^-3, 6.2x10^5)
  30. chem 12

    a) Calculate [H3O^+] in a 0.15M solution of benzonic acid, HC7H5O2(aq) having K of 6.4x10^-5. b) Calculate the per cent ionization of the HC7H5O2. I got.. Kb = [HC7H5O3][OH]/HC7H5O2 6.3x10^-5 x Kb =1.0x10^-14 Kb = 1.0x10^-14/6.3x10^-4 = 1.5x10^-10
  31. Science (Chemistry!)

    I just do not understand ANYTHING about multiplying/dividing/adding/subtracting significant figures! For example, the problem is: Solve the following to the correct number of significant figures: (5.039)(0.0074) What am I supposed to do? Just multiply the
  32. Algebra I - Answer check

    2. a) 7^12/7^4 = 7^8 b)x^11/x^5 = x^6 c)12x^5/3x^2 = 4x^3 d)7x^6y^3/14x^3y = .5x^3y^2 5. a) (2x)^3(3x^2)^4 = 648x^11 b)(5x)^7/(5x)^4 = 25x^2 c)(2x)^5/-8x^3 = -4x^2 d)(4x^2y^5)(-3xy^3)^3 = -12xy^4 6. How long does it take light to travel from the Sun to
  33. Pre-Algebra

    Ragweed pollen has a diameter of about 2.3x10(exponent -5)meters. Under a microscope the pollen appears to have a diameter of 2.3x10(exponent -2) meters. how many TIMES larger is the magnified image under the microscope?
  34. Math

    Ragweed pollen has a diameter of about 2.3x10(exponent -5)meters. Under a microscope the pollen appears to have a diameter of 2.3x10(exponent -2) meters. how many TIMES larger is the magnified image under the microscope? I don't get it! What do u have to
  35. chemistry

    (3.0 x 10^4 ) ÷ (6.2 x 10^1) = 18.6x10^3 (4.7 x 10^-3 ) ÷ (9 x 10^-4) = 42.3x10^-7 (3.0 x 10^4 ) x (6.2 x 10^1) = 18.6x10^3 (5.1 x 10^2 ) x (3 x 10^4) = 15.3x10^-2
  36. SCIENCE - PLEASE HELP PLESE

    1) Round 578.683 m, 47.3333 kg, and 789.5 cm to four significant figures. 2) Find the weight of a 12.25 kg dog. Round your answer to the correct number of significant figures. Use weight=massxfree-fall acceleration. 3) Round 3155.24m, 8.777 73 cm, and
  37. Math; PLEASE CHECK MY ANSWERS

    1.Which of the following is greater than 4.3x10^9 A)2.1x10^9 B)3.2x10^9 C)5.3x10^9 D)7.4x10^8*** 2.Which of the following are less than 6.5x10^-5? A)1.4x10^-3 B)2.5x10^-4 C)7.8x10^-5 D)4.6x10^-6*** 3.Which number is greater than 5.5x10^-7 A)1.8x10^-12
  38. Science help

    A drop of oil volume 0.05cm^3 is released from a medicine dropper on to a calm surface of a pond where it spreads out to cover an area of 40cm^2. Assume that the oil film has a uniform thickness equal to the diameter of an oil molecule. I see there is an
  39. Chemistry

    Hi guys! I just learned about significant figures today, and I have a question about them. My teacher gave us a problem where all values have what I think is four significant figures (like 44.56) except the value for temperature (which is 25.5C). Are
  40. Math

    Any help would be appreciated! What is 38.896/5.1 + 509.15 to the correct number of significant figures? 516.78 What is (154+8446.1)/54 to the correct number of significant figures? 159.261 Thanks!
  41. Chemistry

    answear in standard exponential form with correct number of significant figures 0.57 cm X 0.86 cm X 17.1 cm= what don't you understand? Please be specific. You may have two significant figures in the answer.
  42. math

    I solved (3x10^6)(2x10^5). My teacher said we were supposed to add the exponents. Do we still foil when we use exponents? Thanks, Kerry.
  43. Algebra

    What is the order of the numbers from least to greatest? A=4.6x10^-4 B=2.4x10^-3 C= 3.5x10^5 D=6.3x10^-4 A.C<A<B<D B.D<A<C<B C.B<C<A<D D.A<D<B<C**** Correct me if I'm wrong please
  44. Algebra

    What is the order of the numbers from least to greatest? A=4.6x10^-4 B=2.4x10^-3 C= 3.5x10^5 D=6.3x10^-4 A.C<A<B<D B.D<A<C<B C.B<C<A<D D.A<D<B<C**** Correct me if I'm wrong please
  45. Science- significant figures

    Find the answer with its correct number of significant figures. 4.311 x 0.07 =?
  46. Physics please help

    The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four
  47. Chemistry - Significant Figures

    Suppose it takes 35 min for 2.4 g of sugar to completely react with another reagent we added to the flask. What would the reaction rate be? Calculate to the correct number of significant figures.
  48. Physics please help

    The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four
  49. Physics

    The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four
  50. Physics please help

    The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four
  51. chemistry

    For the reaction 2A(g) + B(aq) + 3C(l)<------> D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr i got an answer of 1.83x10^-13 is this correct??
  52. Significant figures

    How would I go and express these numbers with 3 significant figures in normal notation? a)15.08 b)1444 c)83,909 d)0.524 e)0.0254 for d and e aren't they already with 3 significant figures and also in normal notation? for a, b, and c I can't figure out what
  53. Science

    I'm a little confused when it comes to significant figures. Where it doesn't make sense to me is when zeros come before and after a number. For example: My book states that zeros that come before a digit are NEVER significant. Now this makes sense if you
  54. Chemistry

    I have a Chemistry question which should be very simple but I do not know what significant figures are. Assuming the following numbers are measurements and using the rules for significant figures, determine the answer for the following calculation.
  55. Chemistry

    How you do this? can you do the first one, i'll try the second one if you can explain Perform the following operations and give the answear in standard exponential form with the correct number of significant figures 1) 37.2mL + 18.0mL + 380mL= 2) 0.57cm x
  56. chemistry

    Which weak acid would be best to use when preparing a buffer solution with a pH of 8.50? 1) an acid with Ka=3.3x10^-9 2) an acid with Ka=5.0x10^-4 3) an acid with KA=6.3x10^-6 4) an acid with Ka=5.0x10^-7 5) an acid with Ka=4.0x10^-5 6) an acid with
  57. math

    write 480 in a) 1 significant figure b) 2 significant figures c) 3 significant figures d) 4 significant figures
  58. math

    perform this operation to the correct significant figure. 2.0cm × 0.01m in the correct significant figure. should the answer be in two or one significant figures
  59. Physics help please

    A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron mp=mass of proton=1.673x10^-27
  60. physics

    round of the following digits- 3.65*105(upto are place of decimal) 0.882026(upto three significant figures) 311.299(upto four significant figures) 4.783(upto two significant figures)
  61. physics online

    Assuming that Albertine's mass is 60.0 , what is , the coefficient of kinetic friction between the chair and the waxed floor? Use = 9.80 for the magnitude of the acceleration due to gravity. Assume that the value of found in Part A has three significant
  62. chemistry

    are these right? How many atoms are there in 1.3x10^22 molecules NO2? atoms=(1.3x10^22 molecules NO2) x (2atoms/1molecule) = 2.6x10^22 atoms NO2 A 5.0g sample of O2 is in a container at STP. How many atoms of oxygen are in the container? atoms = (5.0g O2)
  63. Chemistry

    4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A + B --> 3C I 2.8x10-5 M 2.5x10-4 0 C -2x -x +3x E 2.8x10-5-2x 2.5x10-4-x 3x10-5 B = 2.5x10-4-x = 2.4x10-4 x = 1x10-5 A =
  64. Analytical Chemistry

    You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.086 M NaOH. Next, you add 1.00 mL of 8.87 × 10-4 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine
  65. math

    26.3 x 10^3 + 4x10^3 = 26.3+4= =30.3x10^3
  66. Math

    ( 7.5x10^11 ) - ( 4.3x10^8 )
  67. physics

    I also need help with 9.67nm=???km and 2.3X10 to the -4g=????ng
  68. math

    (2x10^5)(3x10^6)
  69. math

    how to solve 3m-6=3x10-6
  70. maths

    (5x10^7)+(2.3x10^7) 73^6
  71. phsics

    Assuming that Albertine's mass is 60.0kg , what is μk, the coefficient of kinetic friction between the chair and the waxed floor? Use g = 9.80m/s2 for the magnitude of the acceleration due to gravity. Assume that the value of k found in Part A has
  72. MATH

    2+3x10 DIVIDED BY 5x3-9= ????
  73. MATH

    SIMPLIFY: 2+3x10/5x3-9=???
  74. multiplying and significant figs

    Multipy and keep only the correct number of significant figures. 101.6 * 3
  75. Physics

    During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s. How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long
  76. Scientific nottion

    3x10`6 square meters
  77. maths

    what is half of speed of light? (3x10^8m/s)
  78. GVCS

    how do u find the standard numeral for 9.3x10^-4
  79. Math

    what is the answer to 3x10=(2x10)+(1x__)
  80. Analytical Chemistry

    A solution is prepared by dissolving 0.2222 (¡¾0.0002) g of KIO3 in 50.00 (¡¾0.05) mL. (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of significant figures. (ii) Find the molarity and its uncertainty with an
  81. physics

    how do you convert 3x10^-3 rad to 10 min of arce
  82. math

    when simipliified (2x10^3)(3x10^4)is equivalent 6x10^7
  83. chemistry

    A solution is prepared by dissolving 0.2222 (¡¾0.0002) g of KIO3 in 50.00 (¡¾0.05) mL. (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of significant figures. (ii) Find the molarity and its uncertainty with an
  84. PHYSICS

    PLEASE HELP WITH PART E AND F THANKS!! Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = THE ANSWER IS-34 Part B Express your answer in meters using
  85. Significant Figures

    Report the following to two significant figures a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995 - 0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946
  86. Science- Significant Figures

    You calculate the area of a 150m x 100.0 m room. How many significant figures should your answer include? a. 1 b. 2 c. 3 d. 4 2?
  87. Math

    1.2 (1+ 23.0 x 10-6/°C*50) Could someone solve this problem for me and tell me how did you get the answer? I've tried to solve this problem in so many ways, but can't get the right answer. My multiple choices are A.0.001386 meters, B.0.00180 meters,
  88. Math

    What is the property type of (2x100)+[(1x100)+(3x10)]+(5x10)
  89. Math

    5x10^2=5x100=500. 3x10^3=3x100=300.
  90. math

    multiply and write the answers without exponents. (3x10^2)x(2x10^4)
  91. chemistry

    what is Kc for 2NOBr-->2NO+Br2 when the temperature is 1000K and the Kc is 1.3x10^-2
  92. math

    which is the best estimate for (6.3x10-2) (9.9x10-3) written in scientific natation
  93. Significant Figures

    Report the following to two significant figures a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995 - 0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946 Can someone please check my answers a. 3.1 b. 6.0 c. 42 d. 6.0 x 10^23 e. 18 f. 10. g. 4.5 x
  94. significant figures

    82.453 in 3 significant figures with scientific notation. ~hm..I don't know how to do this...it sounds simple but I'm confused. Help please =)
  95. physics

    Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = Part B Express your answer in meters using two significant figures. |A⃗ | = m Part C B⃗ =( 2.5
  96. Chemistry

    The question asks me to find the absolute error using the true value=.1025M, and the mean=.1077 The answer I got was .0052...how would I convert this to 4 significant figures? (since the values have 4 significant figures)
  97. Significant figures in chemistry

    can someone please explain significant figures to me?I don't understand how to round them to the right number.
  98. chemistry

    use exponential notation to express the number 480 in 3 significant figures and 4 significant figures
  99. chemistry

    Suppose you are asked to find the area of a rectangle that is 2.1-cm \rm cm wide by 5.6-cm \rm cm long. Your calculator answer would be 11.76 cm 2 \rm cm^2 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not
  100. Chemistry

    Hi I just need help with question (ii) and (iii), i know how to work out (i) A solution is prepared by dissolving 0.2222 (±0.0002) g of KIO3 in 50.00 (±0.05) mL (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of