Questions Asked on
July 31, 2013

  1. chemistry

    concentrated aqueous sulphuric acid is 98% sulphuric acid by mass and has a density of 1.80 g/l. Volume of acid required to make one litre of 0.1M sulphuric acid solution is

    asked by Pooja
  2. physics

    a boy tosses a coin upward with a velocity of 14.7 m/s. a. find the maximum height reached by the coin. b. time of flight c. velocity when the coin returns to the hand d. suppose the boy failed to catch the coin and the coin goes to the ground, with what

    asked by jenalyn calimag
  3. Math

    Heather has divided $8000 between two investments, one paying 8% and the other paying 6%. If the return on her investment is $550 how much does she have in the larger investment?

    asked by Scott
  4. chemistry

    find the mass of sucrose(molecular mass=342)required to be dissolved per 600cm3 solution to prepare a semi molar solution

    asked by anonymous
  5. physics

    A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be 0.800 s. (a) How far away(m) is the explosion if air temperature is 22.0°C, neglecting the time taken for light to reach the physicist?

    asked by Justin
  6. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

    asked by Justin
  7. physics

    A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be 0.800 s. (a) How far (m)away is the explosion if air temperature is 22.0°C, neglecting the time taken for light to reach the physicist?

    asked by Justin
  8. solid mechanics

    Find the Euler's crippling load for a hollow cylindrical steel column of 3.8 mm external diameter and 2.5 mm thick. Take length of the column as 2.3 m and hinged at its both ends crippling load by Rankine's formula. Using constants as 335 Km/mm² and

    asked by ripon
  9. physics

    The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 38.0 dB?

    asked by Justin
  10. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

    asked by Justin
  11. Harvard Justice

    According to the Professor Sandel, if judgments about the good are unavoidable in debates about justice and rights, is it possible to reason about the good (these judgments about the good)? a) If reasoning about the good means that you must have a single

    asked by Kate
  12. math

    From a standard 52 card deck, how many 5 card hands will have 2 clubs and 3 hearts?

    asked by joe
  13. Using windows

    Which folder is the default choice for saving bitmap or JPEG files created by a user?

    asked by Sofiya
  14. physics

    (a) By what factor is one sound more intense than another if the sound has a level 17.0 dB higher than the other? (b) If one sound has a level 32.0 dB less than another, what is the ratio of their intensities?

    asked by Justin
  15. physics

    19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected?

    asked by Justin
  16. trig

    the base of a trapezoid are 22 and 12 respectively. the angle at the extremities of one base are 65 degree and 45 degree respectively. find two legs?

    asked by kathy
  17. physics

    19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected?

    asked by Justin
  18. Physics

    The figure below shows two springs connected in parallel. This combination can be thought of as being equivalent to a single spring having an effective force constant keff. Obviously, the effective force constant must be related to the force constants k1

    asked by aadsa
  19. Math (Triangles - (Angle of Elevation)

    A television antenna is situated atop a hill. From a point 200 m from the base of the hill, the angle of elevation of the top of the antenna is 80°. The angle of elevation of the antenna from the same point is 75°. How tall is the antenna?

    asked by Drake
  20. physics

    The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 38.0 dB?

    asked by Justin
  21. math

    To win the jackpot in a lottery in Iowa, participants have to select 6 unique winning numbers out of the numbers 1 through 49 in which the order does not matter. What is the probability of winning the jackpot? State your answer as both a fraction and

    asked by emma
  22. Chemistry

    how many moles of Mg2+ and NO3(there is a negative sign on top of the 3 in NO3)form for each mole of Mg(NO3)2 that dissolves?

    asked by mariana
  23. Physics

    The figure below shows two springs connected in parallel. This combination can be thought of as being equivalent to a single spring having an effective force constant keff. Obviously, the effective force constant must be related to the force constants k1

    asked by aadsa
  24. Chemistry

    Indicate which of the metallation reactions given below would be thermodynamically favourable on the basis of the pKa data in non-aqueous media provided. What is the underlying principle that determines whether the reaction occurs? (a) C6H5Li + C6H5CH3 →

    asked by Anonymous
  25. math

    Yani wants to make a scale diagram of the floor plan of his school. He wants his diagram to fit on an 8.5in. by 11in. sheet of paper. The school is 650ft long and 300 ft wide at its widest point. a) what would be a reasonable scale for Yani to use so that

    asked by Anonymous
  26. Math

    A computer chip on a circuit board has a rectangular shape, with a width of 6mm and a length of 9mm. Plans for the circuit board must be drawn using a scale factor of 15. Draw a scale diagram of the computer chip as it would appear on the plans. Please

    asked by Anonymous
  27. physics

    (a) By what factor is one sound more intense than another if the sound has a level 17.0 dB higher than the other? (b) If one sound has a level 32.0 dB less than another, what is the ratio of their intensities?

    asked by Justin
  28. Geometry

    Point Y lies on line segment XZ, between X and Z. The (x,y) coordinates for X and Z are (7,2) and (-3,-3), respectively. If the ratio of line segment XY to line segment YZ is 2 to 3, what are the (x,y) coordinates of Y?

    asked by Anonymous
  29. Physics

    An iorn rod (a=11.8 x 10^-6C^-1) has a length of 1000 meters(or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?

    asked by Jason
  30. physics-optics

    The index of refraction of Ruby is less than the index of refraction of diamond. Why?

    asked by silent_klr
  31. child psychology in general

    most traditional childrens nursery rhymes? a.were written by children b.were written by educators c.make fun of physical distinctions d.encouage tolerance of others my answer is b

    asked by susue
  32. Math (Triangles)

    The vertex angle of an isosceles triangle is 40°20'. Each of the leg measures 320 mm. Find the length of the base.

    asked by Drake
  33. Chem

    A student was performing an extraction procedure of o-Xylene from water into octanol. The total mass of o-Xylene was 0.10 gram (molecular weight 106.2 g/mole). The volume of water was 990mL and volume of octanol 10 mL. There is a head space of 200 mL above

    asked by Sahara
  34. math

    As you follow your favorite NBA basketball team’s statistics, you notice the point guard is successfully shooting 85% from the free-throw line for this season. Assuming he is fouled near the end of a game and shoots with that same success rate, what is

    asked by emma
  35. Chemistry- Please Help!!

    Acetic acid has a Ka = 1.75 x 10-5 and formic acid has a Ka = 1.8 x 10-4. Which is the stronger acid?

    asked by Kelly
  36. Chemistry

    What is the pH of a solution that results from adding 0.075 mol Ca(OH)2 (s) to 1.71 L of a buffer comprised of 0.37 M CH3COOH and 0.37 M CH3COONa? Any help is appreciated!

    asked by Anonymous
  37. Math

    The chief financial officer of a home health agency needs to determine the present value of a $10,000 investment received at the end of year 10. What is the present value if the discount rate is: a. 6 percent? b. 9 percent? c. 12 percent? d. 15 percent?

    asked by April
  38. Math

    Write the ratio 2.7kg to 1.8kg as a fraction to the simplest form, with whole numbers in the numerator and denominator.

    asked by Brenda
  39. tax

    Business Investigation Expenditures. During January and February of the current year, Big Bang LLC incurs $3,000 in travel, feasibility studies, and legal expenses to investigate the feasibility of opening a new entertainment gallery in one of the new

    asked by jose
  40. math!

    Imagine that you are doing research for a term paper in your English class and you have chosen the topic of “expected winnings of a lottery.” You find the following information for your state’s lottery: Prize Probability Jackpot 1 in 60,000,000

    asked by emma
  41. chem

    Suppose that a fully charged lead-acidbattery contains 1.50 of 5.00 . What will be the concentration of in the battery after 3.90 of current is drawn from the battery for9.00 ? \

    asked by paco
  42. Chemistry/Env Sci

    a)the E0 for the reactions 2HOCl + 2H+ + 2e- → Cl2 + 2H20 and Cl2 + 2e- → Cl- are 1.63 and 1.396 volts respectively. Write the half reaction of HOCl being reduced to Cl- and develop the full pE/pH equation for this reaction. b)What is the pE of a

    asked by Dave
  43. Math

    After completing her residency, an obstetrician plans to invest $12,000 per year at the end of each year in a low-risk retirement account. She expects to earn an average of 6% for 35 years. What will her retirement account be worth at the end of these 35

    asked by Tammy smith
  44. statistics

    Suppose a large-scale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The p-value turned out to be .004, and a 99% confidence interval for the

    asked by Alexander
  45. Math

    I need help my homework and when I post I don't get an response what do I have to do for someone look at my homework question. Lincoln Memorial hospital has just been informed that private donor is willing to contribute $5 million per year at the beginning

    asked by April
  46. math

    how many ways can a 3 person subcommittee be selected from a committee of 7 people

    asked by Scott
  47. math

    from a standard 52 card deck, how many 7 card hands have exactly 5 spades and 2 hearts?

    asked by joe
  48. math

    Phil has 20 coins, nickels,dimes, and quarters, totaling $2.30. If he has twice as many nickels as quarters, how many quarters does Phil have?

    asked by vincent
  49. Writing

    Please grade my ACT writing test on a scale of 1-Please make corrections and give me feedback. By the way, I wrote this essay in 30 minutes. ACT Test Prompt: Schools in some states have changed their school calendars so that they are now year-round

    asked by Anonymous
  50. college algebra

    If 4 melons for $0.60, how much would 6 melons cost?

    asked by b1313s
  51. Biomechanics

    What will be the vertical velocity at take off for a high jumper in order for them to clear a height of 2m?

    asked by Natalie
  52. English

    Need help please. For the following exercise, choose a topic, and then determine which method of organization is best suited for its development. Next, write a topic sentence that applies to your treatment of the subject. Finally, list at least four

    asked by Carlos
  53. Math

    If business manager deposits $30,000 in a savings account at the end of each year for twenty years what will be the value of her investment: at a compound rate of 12 percent? at a compounded rate of 18 percent? What would the outcome be in both cases if

    asked by April
  54. ics

    basically speaking,a contingancy plan is

    asked by wesam
  55. Chem

    Ka1 = 4.5E-7 and Ka2 = 4.7E-11 for the carbonate system. Ksp is 5.0E-9 and Kw =1.0E-14. A town’s groundwater has [Ca2+] = 37 mg/L, alkalinity of 1.36E-3eq/L and pH of 8. This is to be mixed with surface water with [Ca2+] = 4mg/L, alkalinity of 8.0E-4

    asked by Michele
  56. MATH 11

    Yani wants to make a scale diagram of the floor plan of his school. He wants his diagram to fit on an 8.5in. by 11in. sheet of paper. The school is 650ft long and 300 ft wide at its widest point. a) what would be a reasonable scale for Yani to use so that

    asked by Please Help!!!
  57. math

    The supplement of an angle measures 11 times its complement. Then the measure of the angle is: (A) 9 degree (B) 99 degree (C) 81 degree (D) 90 degree (E) none of these not just answer, please tell me how to do it

    asked by vincent
  58. differential calculus

    a bed is in a form of a circular sector. find its radius if the area of the sector is 1000 centimeter square and its perimeter is a minimum

    asked by len
  59. Creative Writing

    [Much like the wind that swirled around with a few fallen leaves, his mind whirled and buzzed with thoughts that would continue to move around, but never leave.] I can't think of a good way to describe thoughts like the 'wind.' Can anyone help, or does

    asked by Millie
  60. math

    a box filled with identically shaped balls contains 5 balls with the number 1 on them, 8 balls with the numbers 10 on them, 15 balls with the number 12, and 2 balls with the number 20 on them. If the balls cannot be seen from outside the box, and if one

    asked by tg
  61. Futher maths

    Given the vector p=i+2j-2k and q=2i-j+2k. Find two vectors m and n satisfyin all the followin conditions:m is pendicular to p , n is pendicular to p,m+n=q.

    asked by Gideon
  62. grade 3 math

    write a word problem that uses multiplication and the product is 18

    asked by loli
  63. math

    9 coins that equal 83 cents

    asked by loli
  64. Trigonometry

    Find all solutions of 4(sin(x)**2)-8cos (x) -8 = 0 in the interval (2pi, 4pi). (Leave your answers in exact form and enter them as a comma-separated list.)

    asked by Holly
  65. physics

    if you continue to lower the water level after recording length at the first sound resonance at fixed tuning fork frequency, you will hear the sound again but the sound gets louder(seond resonance). at this point, by what factor has length increased? why?

    asked by fakhrul
  66. Math

    A rectangular field has a length that us 2 meters less than 3 times the width. The perimeter is 188 meters. Find the dimensions of the field

    asked by Jim
  67. Trigonometry

    Find all solutions of 4(cos(x))**2-4 sin(x)-5=0 in the interval (6pi, 8pi) I tried to work it out and got: 4(cos**2x)-4cosx -9 = 0, but I can't figure out what cosx = from there to finish the problem.

    asked by Holly
  68. Biology

    Which of the following best predicts the response of a trait to artificial selection? VA VG standard deviation h2 H2

    asked by ChingChong
  69. Writing

    Please grade this and make corrections. ACT writing prompt: The Children's Internet Protection ACT (CIPA) requires all school libraries receiving certain federal funds to install and use blocking software to prevent students from viewing material

    asked by Anonymous
  70. solid mechanics

    A piece of material 15 cm long by 2.5 cm square is in compression under a load 100kN. If the modulus of elasticity of the material is 105 GPa and Possion's ratio is 0.25, find the alternation in length if all lateral strain is prevented by the application

    asked by ripon
  71. Animal Physiology HELP!!!!!!!!!!

    Please help me!!! What are the answers to these Animal Physiology questions? Urgent..... A decrease in the partial pressure of carbon dioxide in the lungs is referred to as a) Respiratory acidosis b) Hypercarbonia c) Hyperoxia d) Hypercapnia

    asked by Sally
  72. Math

    After completing her residency, an obstetrician plans to invest $12,000 per year at the end of each year in a low-risk retirement account. She expects to earn an average of 6% for 35 years. What will her retirement account be worth at the end of these 35

    asked by April
  73. Trigonometry

    Find all solutions of 4 (cos (x)**2)-1=0 in the interval (6pi, 8pi). (Leave your answers in exact form and enter them as a comma-separated list.)

    asked by Holly
  74. World History

    Under what circumstances does it appear that paleolithic humans first used boats?

    asked by Alex
  75. math!

    Suppose that to land on Free Parking in the game of Monopoly, you will need to roll a 3, and to land on Chance you will need to roll a 7. What is the probability that on your roll of two fair, six-sided dice that you will land on either Free Parking or

    asked by emma
  76. Statistics

    Of the 5,352 requests for medical records, 4,257 were located within the 20-minute time frame established by the supervisor as a qulaity improvement indicator. What is the rate of compliance in answering requests for records?

    asked by Karolina
  77. physics-magnetism

    The direction of magnetic lines of force change if an iron piece is placed in its field. Why?

    asked by silent_klr
  78. Algebra

    If y is a positive integer, for how many values of y is 3/2y greater than 1/4 and less than 1/2?

    asked by Anonymous
  79. math

    list all numbers from the given set {-9,-4/5,0,0.25,/3,9.2,/100} that are a) whole numbers b) natural numbers c) intergers d) rational numbers e) irrational numbers.

    asked by TINDO
  80. statistic

    A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? The null hypothesis is: he null hypothesis is The die is biased towards the face with six spots. The chance that

    asked by Bob
  81. math

    Determine how many 1000 digit numbers A have the following property: When any digit of A, aside from the first, is deleted to form a 999 digit number B, then B divides A.

    asked by Steven
  82. math

    Define the function f(x)=2x/(1−x^2). Find the number of distinct real solutions of the equation f^(5)(x)=x.

    asked by Steven
  83. Stats

    There are 21,000 students in a MOOC. Each student tests the fairness of a coin (yes, the same coin; the instructor somehow gets Tyche¢s help in getting the coin to each student in turn). Specifically, each student tests: Null: p is equal to 0.5

    asked by I need help..
  84. child psychology in general

    which one of the following words or phrases is most closely related to piagets theory? a.psychoanalytical b.oedipal c.programmed learning d. stage by stage my answer is d

    asked by susue
  85. math

    there were 400 tickets for a play. 258 adult tickets at 255 each. 57 senior citizen tickets were sold at 125 each. some were sold at 150 each and the remaining were given free to the performers, friends and relatives. if 758 were collected from the sale of

    asked by kitty:)
  86. Hypothesis-Test

    A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question. The alternative hypothesis is: a) The die is biased b) The chance that the face with six spots

    asked by Correct?
  87. biology

    Why all enzyme work well in their own optimum temperature and optimum pH ? i need more explanation about why different enzyme have different optimum temperature and different optimum pH to react. i hope to get a long explanation for my essay that contain 5

    asked by kate
  88. english

    Need Help getting started.. For the following exercise, you will need to write a short paragraph of your own. Remember to use the grammar guidelines and sentence consolidation strategies of the previous lessons. This might also be a good opportunity to

    asked by Josh
  89. math

    A rectangle has a perimeter of 42 cm. One of its sides is 11 cm long. What are the demensions of the rectangle??

    asked by Amber
  90. Physics

    A boiler furnace releases 10000.000kJ of heat for each kg of fuel burned and produces dry saturated steam at 10000.000kPa from feed water at 190.000 degrees Celsius. How many kg of steam will be produced for each kg of fuel burned if the boiler had an

    asked by Danny
  91. trig

    Find all solutions of cos (x) + 1/2 sec (x) = -3/2 in the interval (2pi, 4pi) (Leave your answers in exact form and enter them as a comma-separated list.)

    asked by Holly
  92. Algebra

    Solve by factoring a^2-6a+9=0

    asked by Dottie
  93. math

    using simple interest on a loan at 8.4% for one year making monthly payments. Find the APR on a $5000 loan.

    asked by Scott
  94. Physiology

    Do you think the use of advanced technology like functional MRI will eventually make animal testing obsolete?

    asked by Tise
  95. English

    A singing group that began as a way to help military moms cope with wartime anxiety is now bringing cheer to civilians and veterans. The Swingin' Blue Stars formed just after 9/11. Almost 12 years later, the group is still taking its show on the road.

    asked by rfvv
  96. child psychology in general

    the main problem with informal theories is they are based on? a.others experiences b.bias c.emotion d.tradition rather than study my answer is b

    asked by susue
  97. child psychology in children

    the compensator personaliy type expects his or her child to be > a.endangered b.unruly c.an achiever d.self sacrificing my answer is c the text says your getting a chance I never did,dont let me down,your always got to be first,winning is all that mattters

    asked by susue
  98. child psychology in general

    psychological theories sees childrens behaviour as primarily? a.goal oriented b.instinctive c.emotion triggered d. constant my answer is a

    asked by susue
  99. child psychology in general

    in conducting experiments the test scientific theories exceptions? a.can be ignored if they are few in number b.tend to disprove or substantially weaken the theory and must be reported c.are included in order to increase the power theory d.suggest that the

    asked by susue
  100. business class

    I'll be handling a business class. I don't know how to start and what strategies am I going to use.. Please help... Thank you...

    asked by klarmaesen
  101. math

    The area of a triangle is 80 square meters and the base measures 20 meters. Find the number of meters in the measure of the altitude.

    asked by vincent
  102. Grammar

    Is this sentence correct? Wife's first time making pumpkin bread.

    asked by Anonymous
  103. Maths

    A polynomial ax^3+bx^2+cx+d leaves a remainder 10x+11 upon division by x^2-1 and also leaves a remainder -6 upon division by x^2+x+1. What are the values of a,b,c,d?

    asked by KK
  104. Grammar

    Wife's first time making pumpkin bread. Can I correct like this? His wife made pumpkin bread for the first time. Or This is the first time my wife made pumpkin bread.

    asked by Anonymous
  105. Chemistry- Please Help!!

    If a 0.10 M solution of an acid has a pH of 4.5, what would be the predicted pH of a .10 M solution of the conjugate, and why?

    asked by Kelly
  106. Pre-Algebra

    The sum of 5x^2 + x and -2x^2 - 3x - 1 ?

    asked by Celest
  107. math

    Two numbers A and B are graphed on a number line. Is it always,sometimes, or never true that A-B < A+B?

    asked by Teyonya