jazz

Most popular questions and responses by jazz
  1. Chemistry URGENT

    A student heated a hydrated salt sample with an initial mass of 4.8702 g, After the first heating, the mass had decreased to 3.0662 g (two part question) 1. if the sample was heated to constant weight after reheating, what is the minimum mass that the

    asked on April 26, 2014
  2. chemistry URGENT

    I need someone to check my answers to make sure that I have the correct answers. (3 Part Question) Two students each measure the density of a quartz sample three times: Student A Student B 3.20 g/mL 2.82 g/mL 2.58 g/mL 2.48 g/mL 2.10 g/mL 2.59 g/mL mean

    asked on April 26, 2014
  3. Chemistry URGENT

    can someone please tell me what formula's to use for the 2 following chemistry problems. 1. Calculate the solubility of potassium bromide at 23 degrees Celsius. hint. Assume that the solubility increases by an equal amount for each degrees between 20

    asked on April 28, 2014
  4. math

    the paralle side of trapezium are 20m and 30m and its non-paralle sides are 6m and 8m .find the area of trapezium

    asked on November 22, 2012
  5. poisson distribution math

    Mr Lee is planning to go fishing this weekend. Assuming that the number of fish caught per hour follows a Poisson distribution with mean 0.6, find the number of complete hours that Mr Lee needs to fish so that the probability of catching more than two fish

    asked on June 8, 2010
  6. physics

    The electric field at the point x = 5.00cm and y = 0 points in the positive x direction with a magnitude of 10.0 N/C. At the point x = 10.0cm and y = 0 the electric field points in the positive x direction with a magnitude of 16.0 N/C. Assume this electric

    asked on January 27, 2012
  7. Chemistry URGENT/DR BOB

    Can someone may sure that I balanced the following groups of equations correctly. Write an equation to show how acetic acid reacts with water to produce ions in solution. C2H4O2 + H2O >>>>>>> H3O + C2H3O Write an equation for the neutralization of HCl and

    asked on April 23, 2014
  8. physics

    An object with a charge of -4.5 micro C and a mass of 1.1×10−2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. A) Find the magnitude of the electric field. B)Find the direction of the electric

    asked on January 27, 2012
  9. Math 0098

    Last year, Deon had $20,000 to invest. He invested some of it in an account that paid 6% simple interest per year, and he invested the rest in an account that paid 10% simple interest per year. After one year, he received a total of $1880 in interest. How

    asked on February 22, 2013
  10. physics

    In a pig-calling contest, a caller produces a sound with an intensity level of 110 dB. How many such callers would be required to reach the pain level of 120 dB?

    asked on November 26, 2011
  11. physics

    A 4.00-kg object is attached to a vertical rod by two strings. The object rotates in a horizontal circle at constant speed 6.00 m/s. What is the tension in the upper string and the lower string. Well your missing information here, in order to compute the

    asked on October 9, 2006
  12. Chemistry URGENT/DR BOB

    Hello Dr. Bob I have been sick and missed some of my classes and my classmates want to act stupid. So if its not too much trouble could you just make sure that I am on the right track and let me know what is wrong and how I can fix them. I have a lot of

    asked on April 23, 2014
  13. math gr8

    calculate o.76& of 150% of 6000. i did 0.0076 x 150 = 1.14 6000 x 0.0114 = 68.4 but im not really sure how to do it. plz help!

    asked on November 1, 2008
  14. chemistry

    true or false Entropy always tend to favor mixing Mixing result in positive change in entropy Entropy allows endothermic processes to be spontaneous Pure liquids don't have entropy Addition of salt to water increases entropy Entropy is the measure of

    asked on May 6, 2015
  15. Physics

    A girl delivering newspapers travels 3 blocks west, 8 blocks north, then 5 blocks east. 1) What is the magnitude of her resultant displacement? Answer in units of blocks. 2) Find the direction (measured from due east, with counterclockwise positive) of her

    asked on October 31, 2016
  16. physics

    Mars Rover When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12 min to travel from Earth to the rover.How far was Mars from Earth at that time?

    asked on March 4, 2012
  17. physics

    Water flows through a horizontal tube of diameter 2.9cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa. A)Find the speed of flow in the first tube.

    asked on December 4, 2011
  18. math

    the sale price of a computer at 15% off is $746.30. What is the regular price?

    asked on November 1, 2008
  19. geo

    natural environment, history, and level of economic development are factors that influence population patterns. Looking at the case study on Australia, can you think of any other factors that may influence population patterns? Explain. umm.. translation

    asked on November 2, 2008
  20. math math math!

    A cruise ship travelled 84 km in 3.5 h. At this rate, how long will it take to travel 1050 km?

    asked on November 1, 2008
  21. Calculus: Optimization

    I have no idea how to approach this problem, if someone knows just how to relate h, r with H,R, that would be extremely helpful and I can workout the rest! Thank you in advance. Given a right circular cone, you put an upside-down cone inside it so that its

    asked on February 17, 2015
  22. math

    In 1805, the population of a small town was 2120. By 1905, the population increased to 115% of the 1895 figure. a) what was the population in 1905? b) find the increas in population from 1895 to 1905.

    asked on November 1, 2008
  23. physics

    The mass of the Earth is 5.98 × 1024 kg. A 6.83 kg bowling ball initially at rest is dropped from a height of 2.12 m. The acceleration of gravity is 9.8 m/s^2. What is the speed of the Earth coming up to meet the ball just before the ball hits the ground?

    asked on January 16, 2017
  24. Chemistry URGENT

    Could someone let me know if I answered these questions? 1. How do you classify the liquid pair mineral oil -- H2O, miscible or immiscible? I believe the answer is immiscible because oil and water do not mix. 2. what would be the Molarity of a solution

    asked on April 29, 2014
  25. Modern world studies

    Write a short paragraph that traces the rise of japan from an isolated society to major industrial and imperial power.

    asked on October 23, 2012
  26. Chemistry URGENT

    I am not good with math problems. I need help with these two problems. I'm not sure what equations to use. please help. A student heated a hydrated salt sample with an initial mass of 4.9702 g. After the first heating, the mass had decreased to 3.0662g. 1.

    asked on April 24, 2014
  27. Repost(Physics)

    A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?

    asked on October 22, 2016
  28. Math

    From a sample set of 10 colored balls--5 green, 3 red and 2 yellow-- 5 are chosen at random WITH replacement. What is the probability that the result will be: green, red, yellow, red, green? Write your answer as a four place decimal number. p(G,R,Y,R,G)

    asked on March 13, 2016
  29. physics

    1.The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2. 2.An airplane taking off from a landing field has a run of 500 m. It starts from rest, moves with constant acceleration, and

    asked on October 9, 2010
  30. chemistry

    I want to know if someone could let me know if I have written my balanced equations correct for the following questions. Write a balanced equation for the reaction of zinc with sulfuric acid. Zn + H2SO4 >>> Zn(S04) +H2 Write a balanced equation for the

    asked on April 21, 2014
  31. physics

    The electron in a hydrogen atom with an energy of -0.544 eV is in a subshell with 18 states. What is the principal quantum number, n, for this atom? What is the maximum possible orbital angular momentum this atom can have? Is the number of states in the

    asked on April 12, 2012
  32. physics

    What is the rms value of the electric field in a sinusoidal electromagnetic wave that has a maximum electric field of 64 V/m?

    asked on March 4, 2012
  33. physics

    An electron drops from the L shell to the K shell and gives off an X-ray with a wavelength of 0.0205 nm. What is the atomic number of this atom?

    asked on April 12, 2012
  34. Physics

    A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?

    asked on October 22, 2016
  35. chemistry

    I am unsure about balancing equation I would like for someone to let me know if I am working this out correctly? I have to write a balanced equation for the reaction when solid magnesium is added to a solution of lead(ii)nitrate, solid lead forms and the

    asked on April 14, 2014
  36. algerbra1

    translate to an algebraic expression 49 less than b

    asked on October 26, 2010
  37. math

    awhh man:( i just had one left. A store owner buys coats for 56$ each. she adds 30% to the cost and sells the coat s at 15% off. find the selling price of each coat. would i do 56 x 0.30 = 16.80 56.00 + 16.80 = 72.80 56.00 x 0.15 = 8.40 56.00 - 8.40 =

    asked on November 1, 2008
  38. math

    janine is paid commission of 3% on all sales up to and including $10 000, and 5% on all sales over 10 000. how much commission will she earn on sales of 48 000?

    asked on November 1, 2008
  39. abnormal psychology

    Is this true or false Abnormal psychology examines the concept of “differentness.” The spectrum of “differentness” is narrow in scope when compared to other areas of psychology.

    asked on November 3, 2013
  40. Math 0098

    Last year, Joe had to invest. He invested some of it in an account that paid simple interest per year, and he invested the rest in an account that paid simple interest per year. After one year, he received a total of in interest. How much did he invest in

    asked on February 22, 2013
  41. physics

    Water flows through a horizontal tube of diameter 2.9 cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa. Find the speed of flow in the first tube.

    asked on December 4, 2011
  42. Physics

    a car travels at 20km/h for 1.5h, at 30km/h for 2.0h, and at 40kmh for 0.75 h. What is the car average velocity

    asked on August 1, 2011
  43. chemistry

    A typical air sample in the lings contains oxygen at 100 mm Hg, nitrogen at 573 mm Hg, carbon dioxide at 40mm Hg and water at 47 mm Hg. What is the total pressure on the sample in mm Hg?

    asked on November 19, 2010
  44. Chemistry

    Calculate the molarity of 1.77 mol of LiCl in 30.6 L of solution. This is for hw that's submitted online. the answer i got is 0.06 M. but it says its wrong, whyyyyy?

    asked on October 29, 2010
  45. health

    Which organization would you call if you were involved in a natural disaster?

    asked on October 6, 2010
  46. Physics

    A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 591 N. As the elevator later stops, the scale reading is 391 N. Assume the magnitude of the acceleration is the same during starting and stopping, and

    asked on October 9, 2006
  47. math

    A Singaporean has assets of $5 billion.If he spends $10 every second,how long will it take for him to spend all his money

    asked on November 22, 2015
  48. abnormal psychology

    Is this true or false With regard to life transitions, adolescence appears to be a time of particular stress because of the many changes that occur.

    asked on November 3, 2013
  49. physics

    A uniform electric field of magnitude 2.80×10 ^4 N/C makes an angle of 37 degrees with a plane surface of area 1.40×10−2 m^2. A)What is the electric flux through this surface? N * m^2/C

    asked on January 27, 2012
  50. Math

    Need help understanding 2010-2011 Transitional Unit: 06 Lesson 01- Unit: 05 TESCCC source It is called Maintain Your Balance Can someone please help?

    asked on January 18, 2012
  51. chemistry

    a sample of unknown gas is found to have a volume of 479 mL at 27.0 degrees C and 1.30 atm. How may moles of gas are int eh sample?

    asked on November 19, 2010
  52. Chemistry

    A single mole of AgNo3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNo3 would need to be dissolved in 5oomL?

    asked on November 2, 2010
  53. chemistry

    I have to write a balanced equation for the reaction of a solid lead being added to a solution of silver nitrate. Solid silver forms and the lead disappears as it goes into the solution as lead (ii) nitrate. I think it should be Pb + AgNO3 >>>> Ag +

    asked on April 14, 2014
  54. chemistry

    I have to write a balanced equation for the decompostion of solid copper (ii) sulfate to form the gaseous sulfur trioxide and solid coper (ii) oxide. I would appreciate it if you could tell me if I have written it correctly. CuSO4 >>> SO3 + CuO If I did

    asked on April 14, 2014
  55. physics

    A 5.2 m wire with a mass of 86 g is attached to the mast of a sailboat. If the wire is given a "thunk" at one end, it takes 0.085 s for the resulting wave to reach the other end. Part A What is the tension in the wire? Would the tension found in part A be

    asked on November 26, 2011
  56. science

    How would i write an hypothesis for this? What grass seed grows the fastest?

    asked on November 2, 2008
  57. Chemistry URGENT

    I need someone to check to make sure that I balanced my equations correctly. I have to add a (g) or (s) to indicate gases and precipitates. I am having a hard time figuring out the ions and how to add them, if any of these reactions need a ion could you

    asked on April 24, 2014
  58. physics

    A circuit consists of a 12.0 V battery connected to three resistors 44 ohms, 15 ohms and 120 ohms in series. A)Find the current that flows through the battery. B)Find the potential difference across the 44 Ohms resistor. C)Find the potential difference

    asked on February 12, 2012
  59. chemistry

    Find the mass of urea needed to prepare 51.7 g of a solution in water in which the mole fraction of urea is 7.59×10−2. anyone have the same values?

    asked on January 31, 2012
  60. physics

    The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2.

    asked on October 9, 2010
  61. l2l

    If I had 10 trees and i had to plant them in 5 rows of 4 how would it work i need to do this

    asked on June 17, 2010
  62. Chemistry

    I have troubles with a titration of NaOH and HCl. The volume of the HCl is 30 ml and its concentration is 0.1 mol per liter The volume of the NaOH is 25 ml and the concentration is to be worked out. I understand that the reaction ratio for HCl to

    asked on May 17, 2010
  63. geo

    name three population characteristics that tell us whether a country's population is changing(growing, stable, or shrinking)

    asked on November 2, 2008
  64. Math

    I cannot remember how to find the slope of a line when you are given two points. Here is the problem. The slope of a line through (2,1) and (5,n) is 3. n=___ I ended up with -2. But I don't think that is the right answer. I put the points in

    asked on January 17, 2008
  65. Chemistry URGENT

    I am having a hard time understanding how to calculate pH. my textbook states that that pH =-log[H^+]. I have two questions that asks: What is the H^+ concentration in an acid with of pH 4.6? Express your answer as a power of 10. What is the H^+

    asked on April 24, 2014
  66. physics

    A 9.2V battery is connected in series with a 33mH inductor, a 190 Ohms resistor, and an open switch. A)What is the current in the circuit 0.140 ms after the switch is closed? in milli amps b)How much energy is stored in the inductor at this time? in micro

    asked on February 28, 2012
  67. geomatry

    the measure of one angle of a linear pair is 3 thimes the measure of the other angle. find the measures of the two angles

    asked on October 18, 2011
  68. Math

    Mrs tan baked some muffins and packed them i big and small boxes for sale.Each big bbox contained 4 muffins and each small box contained 2 muffins.At first,there were 4 times as many small boxes as big boxes.After she had sold half of the small boxes and

    asked on January 8, 2011
  69. 9th grade

    In, 1914 how many European nations controlled territory in Africa?

    asked on December 21, 2009
  70. math.. again!

    write each increase or decrease as a percent. the price of gasoline rose from 97.5/L to 101.4/L. Percent increase= i did: 101.4 - 97.5 101.4 x 0.0390 = 3.9% is this right?? im not really sure how to do this.sorry for all these questions.

    asked on November 1, 2008
  71. science

    advanteges and disadvanteges of fossil fuels Check this site. http://home.clara.net/darvill/altenerg/fossil.htm advantages easy to get energy from not expensive to get energy from disadvantages pollutes the atmosphere with carbondioxide which leads to

    asked on October 12, 2006
  72. Physics

    A knight sits on a castle wall during a siege. To while away the time, he notes that boulders catapulted from below land on the top of his wall with a vertical velocity of 7.5 m/s. If he is 34 m above the catapult, what is the initial velocity of the

    asked on October 25, 2016
  73. Physics

    Judy, by chance, spots a potted plant falling outside the window at 1.6 m/s. Further down the same building, Judy’s boyfriend clocks the pot at 80 m/s. How far apart are the friends? The acceleration of gravity is 9.8 m/s^2. Answer in units of m. Plz

    asked on October 25, 2016
  74. Physics

    Imagine a vessel containing 2.000 kg of liquid whose specific heat equals 1.50 kcal/kg/°c. Suposse that all of the liquid exists at its vaporization temperature of 450 k. We transfer 150 cal of heat energy to the liquid. What is the temperature of the

    asked on April 11, 2016
  75. genetics

    If a green eyes girl whose father is green eyeid marries a brown eye boy then what genotype the nxt generTION has

    asked on April 21, 2015
  76. genetics

    If a green eyes girl whose father is green eyeid marries a brown eye boy then what genotype the nxt generTION has

    asked on April 21, 2015
  77. chemistry urgent

    I think I balanced these equation right please check and let me know. i am suppose to complete and balance the equations representing the reactions. NaHCO3 (s) + HCL (aq) >>>> NaCl + 2CO+H2O CaCo3 (s) + HCL (aq)>>> CaCl + CO3H Thanks

    asked on April 23, 2014
  78. Math

    Does (-18) balance with (-6)+ 3(-4)? Show work to answer please

    asked on January 18, 2012
  79. math

    the perimeter of an isosceles triangle is 30 inches. the legs are 1/3 as long as the base. set up an equation to find each side length of the triangle.

    asked on November 17, 2008
  80. math

    Find the amount in each case. a) 8% is 56 kg. can u set up cross multiplication for this? 8/100=x/56

    asked on November 1, 2008
  81. math helpp! :|

    in a bag of coloured cubes, the ratio of red cubes to total number of cubes is 5:7. If there are 105 cubes in the bag, how many cubes are red? i don't get this :|

    asked on November 1, 2008
  82. physics

    A 1,5000kg car starting from rest is accelerated by a force of 2,oooN during the first 15seconds of its motion. Find the speed at the end of that's time

    asked on January 3, 2008
  83. Chemistry URGENT/DR BOB

    Hello Dr.Bob, the saturate at 60 degrees Celsius is 85.5g i hope this helps with the problem I posted at 12:49am thanking you in advance

    asked on April 28, 2014
  84. Chemistry URGENT

    Help. what is the formula to figure out the total mass of a solution?

    asked on April 28, 2014
  85. Chemistry URGENT

    I need help to evaluate if I completed my experiment calculation. determination of water in a hydrate. 1. Mass of crucible, and cover = 18451.3 2. Mass of crucible, cover and sample = 23410.2 3. Mass of crucible, cover and sample after 1st heating =

    asked on April 26, 2014
  86. Chemistry URGENT/DR BOB

    Hello DR. BOB, the correct value in the problem posted at 1:17pm regarding Student A and Student B accuracy and random error is the: MEAN of 2.63 g/mL. Could you take a look back at that post and let me know if i answered 2 and 3 correctly.

    asked on April 26, 2014
  87. Chemistry URGENT

    I need help figuring out the calculations of my experiment. I'm sure I did something wrong cause I can not figure how to calculate the mass of sodium chloride. My measurements follow. 1. 250 mL beaker = 8.4 2. Mass of container = 0.4013 3. mass of

    asked on April 26, 2014
  88. abnormal psychology

    Is this true or false Behavioral medicine and health psychology are concerned with reducing the stress of illness but not necessarily preventing the stress.

    asked on November 2, 2013
  89. Math :(

    2b=b+2+b 2b= 2b+2 -2b=-2b+2 __________ B=2????

    asked on September 16, 2013
  90. Math-Data Management

    In a random Sample of Canadians 30% have Beeburr CD's (B) 35% have Fergie CD's (F) 55% have Motorhead CD's (M) 5% have B and F 10% have B and M 10% have F and M 95% have at least one artist place in Venn Diagram Find Number and Describe: a) _____ n(BuFuM)

    asked on February 27, 2013
  91. check geo

    the us is a leading exporter of a.oil natural gases b.rice products c.beef and grain. d.cranberries and rasberries

    asked on July 26, 2012
  92. physics

    Two point charges, the first with a charge of +3.04×10−6 C and the second with a charge of -4.63×10−6 C , are separated by 22.5 cm. Find the magnitude of the electrostatic force experienced by the positive charge. Is the magnitude of the force

    asked on January 27, 2012
  93. Physics

    3. The mortar shell was short and you cannot change the explosive charge. You determine that a horizontal velocity of 1,592 feet per second will put the mortar shell. What angle should the mortar be elevated to?

    asked on June 25, 2011
  94. music

    was schubert a romantic or classic composer?

    asked on June 13, 2011
  95. algebra 1

    heip me I tried everything 4(x -1) > 16

    asked on November 4, 2010
  96. algebra 1

    help me please What is the smallest solution to the inequality 4 (x -1) > 16?

    asked on November 4, 2010
  97. algebra 1

    can someone help me solve this equation 5x - 12 < 20

    asked on November 3, 2010
  98. psychology

    what are the basic concepts of human interaction from a psychology perspective. In your examination, describe at least two examples of how human behavior changes based on social situations

    asked on March 28, 2011
  99. algebra 1

    help please this question is driving my crazy. Suppose there is a 2-degree drop in a temperature for every thousand feet that an airplanes climbs into sky. If the temperature on the ground is 65 degrees, what would be the temperature when the plane reaches

    asked on October 26, 2010
  100. chemistry

    what would be the mass of an Au sample whose volume is 2.85mL?( the density of gold is 19.3g/mL)

    asked on October 3, 2010

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