Questions Asked on
August 9, 2012

  1. physics 102

    The output voltage of an AC generator is given by Δv = (180 V) sin (70πt). The generator is connected across a 13.0-Ω resistor. (a) By inspection, what is the maximum voltage? V (b) By inspection, what is the frequency? Hz (c) Find the rms voltage

    asked by Matt Will
  2. biology

    1.What is the % concentration of oil in the first, second, and third trophic levels in our food chain? 2.How did the concentration of oil change from one trophic level to the next? 3.How does the change in concentration represent biomagnification? 4.How

    asked by kiesha
  3. math

    The stiffness S of a rectangular beam is proportional to its width (w) times the cube of its depth/height (h). find the dimensions (i.e.: w and h) of stiffest beam that can be cut from a log which has a circular cross-section with diameter of 12-in.

    asked by deel
  4. physics

    Find the Magnitude of the force exerted by each cable to support the 625 N punching bag. One cable is connected to the ceiling with an angle of 37 degrees and the other cable is connected perpendicular to the side wall (Horizontal). HELPP

    asked by kacey
  5. Chemistry

    500ml of 0.250M Na2SO4 solution is added to an aqueous solution of 15.00 g of BaCl2 resulting in the formation of white precipitate of BaSO4. How many moles and how many grams of BaSO4 are formed?

    asked by Natasha
  6. physics

    A copper block is removed from a 310 C oven and dropped into 1.10 kg of water at 20.2 C. The water quickly reaches 25.4 C and then remains at that temperature.what is the mass of the block?

    asked by Anonymous
  7. physics

    two objects are thrown from the top edge of a cliff with a speed of 10 m/s. one object is thrown straight down and the other straight up. if the first object hits the ground in 4.0 second, the second hits the ground in ________ seconds after the first

    asked by bob
  8. physics

    A 150 N block is at rest on a table, a cable is connected from this block to another hanging off of the table. This block is 75 N. What is the magnitude of the minimum force of static friction on the 150 N block required to hold both blocks at rest? What

    asked by kacey
  9. physics

    A plane leaves Seattle, flies 84.0{\rm mi} at 21.0^\circ north of east, and then changes direction to 52.0^\circ south of east. After flying at 120{\rm mi} in this new direction, the pilot must make an emergency landing on a field. The Seattle airport

    asked by Julio
  10. chemistry

    Lime, CaO, is produced by the decomposition reaction CaCO3(s) ® CaO(s) + CO2(g). What weight of CO2 is obtained by the decomposition of 38.7 g of CaCO3?

    asked by Anonymous
  11. Maths

    A container in the shape of a right circular cone with vertex angle a right angle is partially filled with water. a) Suppose water is added at the rate of 3 cu.cm./sec. How fast is the water level rising when the height h = 2cm.? b) Suppose instead no

    asked by leone
  12. Chemistry

    After 4.00 mol of C2H4(g) and 2.50 mol of Br2 (g) are placed in a sealed 1.0L container, the reaction reaches equilibrium and is written following: C2H4(g) + Br2(g) -> C2H4Br2(g) ... Calculate the equilibrium concentrations of all three substances.

    asked by Sarah
  13. physics

    On a drive from your home to town, you wish to average 52 mph. The distance from your home to town is 106 miles. However, at 53 miles (half way), you find you have averaged only 39 mph. What average speed must you maintain in the remaining distance in

    asked by amanda and leah
  14. Pre-Calculus

    Which sets of ordered pairs represent functions from A to B? Explain. A = {a, b, c} and B = {0, 1, 2, 3} A. {(a, 1), (c, 2), (c, 3), (b, 3)} B. {(a, 1), (b, 2), (c, 3)} C. {(1, a), (0, a), (2, c), (3, b)} D. {(c, 0), (b, 0), (a, 3)} I narrowed it down to

    asked by Peter
  15. chemistry

    Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCL(aq)=>ZnCl2(aq)+H2(g). How many mm of 1.50M HCL(aq) are required to react with 9.05 g of ZN?

    asked by Mimi
  16. math

    Two trains heading toward each other are 400 miles apart. One train travels 15 miles per hour faster than the other train. If they arrive at the same station in 5 hours, how fast is each train traveling?

    asked by stephanie
  17. trig

    (sec 8 x - 1)/(sec 4x -1) = tan 8x/tan 4x Prove it!

    asked by vidhu
  18. algebra

    A tugboat goes 180 miles upstream in 15 hours. The return trip downstream takes 10 hours. find the speed of the tugboat without a current and the speed of the current

    asked by maggie
  19. physics 102

    three lamps connected to a 120-V AC (rms) household supply voltage. Lamps 1 and 2 have 75.0-W bulbs; lamp 3 has a 40.0-W bulb. (a) For each bulb, find the rms current. Irms, lamp 1 = A Irms, lamp 2 = A Irms, lamp 3 = A (b) For each bulb, find the

    asked by Matt Will
  20. physics

    Find the Magnitude of the force exerted by each cable to support the 625 N punching bag. One cable is connected to the ceiling with an angle of 37 degrees and the other cable is connected perpendicular to the side wall (Horizontal). HELPP

    asked by kacey
  21. chemistry

    Concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 hcl solution? My calculation 500ml x 1:200 =2.5 1:200 means

    asked by Fai
  22. chemistry

    A stock solution containing Mn2+ ions was prepared by dissolving 1.168 g pure manganese metal in nitric acid and diluting to a final volume of 1.000 L. Calculate the concentration of the stock solution.

    asked by rachel
  23. Public Health

    All of the following are true of lead as an environmental hazard except? a. Paint in toys is an important potential source of lead exposure. b. The higher the blood lead levels the more severe the biological effects due to lead poisoning. c. Paint in homes

    asked by Antuan
  24. Chemistry

    Assume that the ionic compound CaCl2, separates completely into Ca and Cl ions when it dissolves in water. How many moles of each ion are present in the solution???

    asked by Serena
  25. Physics

    A block of mass m has a spring –spring constant k and length L –connected, vertically, to the bottom. The block is dropped from height h, towards the floor. Assuming the spring is stiff enough that it does not compress fully at the floor, what is the

    asked by Chad
  26. chemistry

    Concentrated hydrochloric acid has specific gravity of 1.18 and 36% hcl weight. What volume of concentrated hcl must be diluted to give 50 gm of 10 percent. My calculation 50gm x 0.1 = 5gm 5gm x 36.5 = 182.5 182.5 / 0.36 = 506.9 506.9 / 1.18 = 430 ml This

    asked by Fai
  27. physics

    You can keep a 3 kg book from dropping by pushing it horizontally against a wall. What force must you apply to the book to keep it from falling? What is the coefficient of static friction?

    asked by kacey
  28. biology

    Trophic Level Cylinder Volume of H2O Volume of Oil Total Volume % Oil 1st 1000 ml 1000 ml 2nd 100 ml 100 ml 3rd 10 ml 10 ml

    asked by kiesha
  29. Art Appreciation

    Discuss how art was used as a vehicle for propaganda, and whether such use is present in the works of Höch, Grosz, and Picasso. Use one example from Gardner's Art through the Ages and one from the Internet.

    asked by Robert
  30. statistics (math)

    The following equation can be used to predict the average height of boys anywhere between birth and 15 years old: y = 2.79x +25.64 where x is the age (in years) and y is the height (in inches). a. What does the slope represent in this problem? Interpret it

    asked by karen
  31. Physics

    A body of mass 10kg moving with velocity 30m/s collide with another body of mass 15kg.If the velocity of both the body are same after collision.Then find their common velocity.

    asked by Aarushi
  32. Child Development

    Written observations of children as their behaviors occur in their context are termed:

    asked by Sandra
  33. Math

    Given the following system is consistent x+y=1 tx+y=t (1+t)x+2y=3 Find the exact value of t.

    asked by Anonymous
  34. reading

    In order to get an idea of significant subject areas in a chapter, it is best to read the: A. subheads. B. graphics. C. captions. D. table of contents.

    asked by chris
  35. consumer math

    The Mannings file a tax return showing $125000 in earned income, $3288 from interest income, and they have a tax credit of 1% of their earned income. They claim 5 exemptions of $2500 each, one head of household exemption of $10500, pre-tax medical

    asked by Megan
  36. physics 102

    What are the wavelengths of electromagnetic wave in free space that have the following frequencies? (a) 3.00 10^19 Hz pm (b) 7.50 10^9 Hz cm

    asked by Matt Will
  37. College Algebra

    1. Use the Intermediate Value Theorem to show that the polynomial function has a zero in the given interval. f(x) = 13x^4 - 5x^2 +7x -1; [3,0] Enter the value of (-3). 2. Use the Intermediate Value Theorem to show that the polynomial function has a zero in

    asked by Kameesha
  38. Politics/Debate

    what does this sentence mean in regular english "The United States Federal Government should substantially increase development of domestic infrastructure." and what is the basic meaning of domestic infrastructure? Tahnk you soo much in advance!!

    asked by Samantha
  39. Physics

    Box, mass m 1 , at rest against a compressed spring, spring constant k and compression of Δx, at the top of a ramp, height h, is released. It slides down the ramp, angle θ, with friction, coefficient μ. Half way down the ramp, it bumps into and sticks

    asked by Chad
  40. math investment

    8. (TCO A)  You can tax shelter only one-half of your retirement savings. You want to invest one-half of your savings in bonds and one-half in stocks. How much of the bonds and how much of the stocks should you allocate to the tax sheltered investment?

    asked by Steven
  41. math

    if the speed of a comet at perihelion (the closest orbital point to the sun) is 98000 mi/h. How far will the comet travel in 30 sec?

    asked by angel
  42. aig math (please answer Ms.Sue)

    Albert bought 28 compact discs for $805.give a quick estimate of the cost of each compact disc.

    asked by lidia
  43. Math

    Mr. R has some money to buy oranges, if he will buy 15 oranges he will need $90 more, if he will buy 10 oranges he will have $60 left. how much money has mr. R? Please kindly solve this using George Polya method.. guess and check...

    asked by Kaloy
  44. trig

    Please help to find the value of: Sin 17 degree.

    asked by Anonymous
  45. science

    what is the kinetic energy of a ball with a mass of 5 kg rolling at 10 m/s

    asked by kaliyjah
  46. Math

    Point E is on side AB of rectangle ABCD. If the area of ABCD is 48, what is the area of triangle CDE?

    asked by Sarah
  47. math

    4 boards (1 inch X 8inchs X 6feet} and 3 boards (1 inch X 6 inches x 4feet}= how many board feet? 1 board foot =1 inch by 12 inches x 12inches

    asked by Sam
  48. Calculus

    This is another textbook number that doesn't have the solution and I can't figure it out. Any tips would be greatly appreciated. For each of the plane surfaces, calculate the exact surface area. (Answer in fractions) (a)The surface composed of all surfaces

    asked by Paul
  49. math

    what is 4.97x10^6 in standard form

    asked by Anonymous
  50. ss

    Describe three social or economic reforms between 1917 and the 1930s that were a result of the mexican revolution? is this good enough.. Obregón, Álvaro, 1880-1928, president of MEXICO (1920-24). A successful general in the Mexican revolution (1910-17),

    asked by melissa
  51. math

    john has a loan but doesn't begin to repay his loan for 11 months, at a rate of $500 every month of four month. the interest rate is 8% compounded monthly determin the size of the loan using the following 2 steps 1. calculate the present value, pv1 of

    asked by jule
  52. Physics

    Some object moves 220.0 m at an angle of 42° north of west. During this motion, a 68.0 N force acts on the same object, doing +5460.0 J of work on the object. Assuming the force is applied horizontal to ground, what is this force’s orientation? Is there

    asked by Chad
  53. algebra

    I need help with doing this problem... 5x-7(2-4x). Any idea how to do it?

    asked by Luke
  54. English

    Is this sentence right? I have never had a pet before.

    asked by Kelly
  55. Math

    $15,000 in the bank at 3% interest, how much would you have in the bank after one year if the interest were compounded quarterly

    asked by Trina
  56. s.t mary's school

    what amout of zinc will be required to generate sufficient hydrogen to completely combined with oxygen obtained by complete decomposition of 30 g of potassium clorate?

    asked by lucy
  57. chemistry

    what amout of zinc will be required to generate sufficient hydrogen to completely combined with oxygen obtained by complete decomposition of 30 g of potassium clorate?

    asked by lucy
  58. Math

    Mr. R has some money to buy oranges, if he will buy 15 oranges he will need $90 more, if he will buy 10 oranges he will have $60 left. how much money has mr. R?

    asked by Kaloy
  59. Maths

    explain subtraction steps

    asked by Athrva
  60. Math

    If a=3^2, b=1/a and c=b^4 then a) a>b>c b) a

    asked by Bob
  61. chemistry

    please could you identify at least 2 limitations each for the coordinate bonding and metallic bonding theories?

    asked by nadia
  62. aig math

    estimate the value. 1705*31

    asked by lidia
  63. Algebra

    Why is the correct answer a^2-a+1 to this problem: a^3+1/a+1

    asked by Taurus
  64. math

    an ordinary anuuity starting in three years with 20 quarterly payment of $400

    asked by jule
  65. Chemistry

    COmbination of nahco3andhcl what is before,after,mixture, and change?

    asked by Sasha
  66. Svience

    I'm just courious what "ragweed mix" is/are. Is it one type of plant or a bunch?

    asked by Kelly
  67. algebra

    A college bookstore ordered six boxes of red pens. The store sold 37 red pens last week and 67 red pens this week. 4 pens were left on the shelf. How many pens were in each box?

    asked by Anonymous
  68. Am i right

    Am i right? The question is how Paul Cezanne contributed to art. Is it, because he made his own style with how he used natural forms into shapes and such, and it influenced Picasso and Braque to create Cubism which later influenced others aswell?

    asked by Bella
  69. Physics

    The wind blows a 0.50 kg Styrofoam box, initially at rest, across level ground and then up an incline where it comes to a rest. The box slides 6.0 m on level ground before sliding up the 20.0 Ovincline. If the effective coefficient of friction between the

    asked by Chad
  70. science

    what is the kinetic energy of a ball with a mass of 5 kg rolling at 10 m/s

    asked by kaliyjah
  71. math

    how do i change 0.26(2/3) to a fraction

    asked by Karen
  72. Pre-Calculus

    Determine whether the equation represents y as a function of x. |y| = 4 - x If I plug in 5, then I get -1, but it also means 1. Does that mean y has 2 values which means that it is not a function?

    asked by Peter
  73. human services

    how does a child's perspective change in middle childhood?

    asked by Susan
  74. human services

    what sex differences in mental abilities become evident in adolescence?

    asked by Susan
  75. Chemistry

    How many grams of CaSO4 are present in 320ml of a 0.00810 M solution of this compound?

    asked by Jim
  76. statistics

    Q) 75% of the population in Guinea, Africa is infected with malaria. Suppose a physician sees 6 patients in a given hour. Assuming these conditions are met, find the mean and standard deviation of the distribution. Help please!

    asked by nick
  77. microbiolab

    what is the importance of using the McFarland standard?

    asked by bing
  78. ENGLISH

    In the following sentence, what is the subject complement? My neighbor is a newspaper reporter.

    asked by Anonymous
  79. math

    If it takes 6 minutes to travel from Point A to Point B at a constant speed of 60 miles per hour, how many minutes does it take to travel the same route from point A to point B a constant speed of 50 miles per hour? I need an equation and a thorough/ clear

    asked by anony
  80. math

    4000*136-5000 explain substraction

    asked by Athrva
  81. history

    When postwar expansion slowed in the 1950s, an economic stimulus was provided by A. increased consumer goods manufacturing. B. Cold War spending. C. the construction of Levitt Towns. D. the baby boom.

    asked by Help please =)
  82. English

    What synonym of crumble can replace it in this sentence: "The town slowly crumbled"?

    asked by Barbie
  83. environmental science

    describe three common challenges with managing non renewable energy sources.

    asked by TIA
  84. Math

    waht are lapse

    asked by Einstein
  85. Law

    What is Jones Act (maritime area)?

    asked by dave
  86. Math

    dear Ms.Sue what do they mean when they say find the tiime lapse.

    asked by Einstein
  87. Psychology

    Describe in detail, the two methods of language acquisition?

    asked by Shahara
  88. Math

    here is the problem Ms.Sue 6:32,9:29.

    asked by Einstein
  89. Child Development

    Which perspective believe growth and development are primarily controlled by nature?

    asked by Sandra
  90. writing

    when you write a sentence, how do you know what a verb, adj.or conjuction is?

    asked by Dee
  91. hwwt

    why do paras have to document everything a child does?

    asked by Dee
  92. Chemistry

    How many grams of a 12.5% (w/w) aqueous solution of HCl do you have to measure out if yo need 32g Of HCl?

    asked by Jim