Questions Asked on
April 8, 2007

  1. Chemistry

    If 3.21 g of BeC2O4 * 3H2O is heated to 220 C calculate the volume of the H2O(g) released, measured at 220 C and 735 mm Hg? please help me Convert g BeC2O4*3H2O to mols BeC2O4*3H2O. Convert mols BeC2O4*3H2O to mols H2O. Use PV = nRT to calculate volume of

    asked by Karisa
  2. physics

    A glass bottle of soda is sealed with a screw cap. The absolute pressure of the carbon dioxide inside the bottle is 1.80 x10^5pa. Assuming that the top and bottom surfaces of the cap each have an area of .0004M^2, obtain the magnitude of the force that the

    asked by CJ
  3. biology

    I have been given a DNA nucleotide sequence and have established the equivalent mRNA sequence.I have then been given 2 mutations and I have worked out the new mRNA sequence but I have to suggest why it may change the function of the new protein. The new

    asked by Hol
  4. Art Question

    Which activity masquerades as creative art? 1. coloring photocopied sheets. 2. drawng and framing a picture for a holiday craft. 3. drawing flowers by observing them closely. 4. encouraging students to copy upside-down pictures. I'm pretty sure it's

    asked by Chrissie
  5. Economics

    5. (Ch. 17 # 5) Sparkle is one firm of many in the market for toothpaste, which is in long-run equilibrium. a. Draw a diagram showing Sparkle’s demand curve, marginal revenue curve, average cost curve, and marginal cost curve. Label Sparkle’s

    asked by Amanda
  6. Physics - angular acceleration

    An object rotates about a fixed axis, and th angular position of a reference line on the object is given by THETA(t)=0.4e^2t, where THETA is in radians, and t is in seconds. [a.] what is the object's angular acceleration at t = 2 s? ..this is my work so

    asked by COFFEE
  7. physics

    An asteroid, whose mass is 2.0 10-4 times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 2.9 times Earth's distance from the Sun. (a) Calculate the period of revolution of the asteroid in years. (b) What is the ratio

    asked by gobind
  8. physics

    An asteroid, whose mass is 2.0 10-4 times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 2.9 times Earth's distance from the Sun. (a) Calculate the period of revolution of the asteroid in years. (b) What is the ratio

    asked by gobind
  9. Physics

    High-heeled shoes can cause tremendous pressure to be applied to the floor. Suppose the radius of a heel is 6.00 10-3 m. At times during a normal walking motion, nearly the entire body weight acts perpendicular to the surface of such a heel. Find the

    asked by Mary
  10. chemistry

    After your explanation I try to solve it, so would you please check my work again. Thank you! a)

    asked by wendy
  11. Math

    1. The question is: List the like terms in the following group of terms. 7z, –8yz^2, 9y^2z, –3yz^2, –5yz^2, 9y^2 I Listed them as follows: -8yz^2, –3yz^2,–5yz^2,9y^2z, 9y^2, 7z 2. The next question asks: List the terms of the following

    asked by John
  12. Physics - Angular Momentum

    When the angular momentum changes, the 'change' in the angular momentum vector (ie. dL) is ____. [a.] perpendicular to the torque vector. [b.] parallel to the angular momentum vector. [c.] parallel to the torque vector. .. im confused on this one.. i think

    asked by COFFEE
  13. math

    please hel me to solve the following application. Crafts. Mark uses 1 pt 9 fl oz and then 2 pt 10 fl oz from a container of film developer that holds 3 qt. How much of the developer remains? Is this US liquid measures? There are 16 fluid ounces to the

    asked by carmen
  14. science project

    i need to do a graphic or table for my science project.The project is Does water with salt boil faster than plain water? Thank you for using the Jiskha Homework Help Forum. Here are some sites on boiling water: 1.

    asked by Jeika Campos
  15. Physics - Conservation of Angular Momentum

    a man is standing on the center of a platform that is rotating without friction. his arms are outstretched holding a brick in each hand. the rotational inertia of the system consists of the man, bricks, and platform about the central vertical axis of the

    asked by COFFEE
  16. physic-heat

    please list all the formulas for calculating the specific heat of a substance please. thanks specific heat = (heat added)/[(mass)(delta T)] That is the equation that defines specific heat. It should be the only equation you need. "delta T" is the increase

    asked by Pauline
  17. Sciece

    Hi Can I have websites that have quizes and tests for Science cause my checkpoint exams are coming and I want specifically in Biology , Chemistry , Physics The topics th at I want are Cells , Atoms elements compounds and mixtures and Energy and Energy

    asked by Hi
  18. physics

    An irregularly shaped chunk of concrete has a hollow spherical cavity inside. The mass of the chunk is 32kg, and the volume enclosed by the outside surface of the chunk is 0.020m^3. What is the radius of the spherical cavity? To solve this, you need to

    asked by Cavin
  19. Biology

    (i) Met, Ser, Leu ------------------------------------------------------------- (ii) Ile, Ser, Phe ------------------ I have calculated the above polypeptides, can anyone explain why changing (i) to (ii) may change the function of the new protein?

    asked by Paul
  20. Biology

    I have to draw a mating diagram to show a cross between two heterozygotes for lactose production. As both adults have the dominant allele L for persistant lactase production would I start the diagram with LL for each parent? Yes, if you mean production.

    asked by Hol
  21. Elementary Education

    Which would be a good activity to develop a child's aesthetic awarness? a field trip to an arboretum or a field trip to a factory Wouldn't it be a field trip to an arboretum to see all the woody plants for scientific and educational purposes? I suspect

    asked by Keisha


    asked by Amanda
  23. Math

    Evaluate. (15 – 5) ÷ [(12 ÷ 2 • 2) – 2] I think the answer is 10. Is this correct. Correct. Please Excuse My Dear Aunt Sally applies.

    asked by Kelly
  24. physic-heat

    the specific heat of water is one of the highest of all substances.why does this make water a useful liquid to use in hot water bottles? and could you use a lump of nickel to warm your bed instead of a hot water bottle?which would be better? why? I will be

    asked by Pauline
  25. Science

    Please unscramble this word snagenhhi P.s it's a type of snake and its found in NorthAmerica I checked this list of North American snakes and didn't find any with two h's in its name. if the h's are k's, then king

    asked by Fia
  26. maths

    can any one tell me a way of working out a percentage from a total for tax purposes. Example; if i have a total of 78 and the tax was 17.5% it would be 78 divide 47 x 7 =11.61 can anyone tell me how to work it out if the tax was 16% thanks "78 divide 47 x

    asked by simon
  27. Accounting

    Can sombody please help. What word can be added to the phrase "Health Care Cost" to make it relate to accounting issues? I will apreciate whoever help me with this question. This is a 50 points question. I don,t want to loose it. Medical Expense, Medical

    asked by Jerremy
  28. Inverse trigonometric function

    How to solve without calculator 1. sin(arctan(12/5)) 2. cos(arccosx + arcsinx) Thanks. You have to know your right triangles. 5 12 13 is one. If the tan is 12/5, then the sin is 5/13. Draw a pic to confirm that. On the second: Think. Draw any right

    asked by Jen
  29. language arts

    I wrote this monologe on abortion but i need to tone it down and make it more symbolic rather than straight forward. I can’t help but picture destroyed, dismember…disarticulated small souls. Waiting to be born but soon before interrupted. A mother’s

    asked by lizzie
  30. chemistry

    this is my work, would you please check my work, thank you! part A a liter of a solution saturated at 225 degree C with calcium oxalate, CaC2O4, is evaporated to dryness, giving a 0.0061 gm residue of CaC2O4. calculate the concentrations of the ions, and

    asked by wendy
  31. chemistry

    To find the mass of a mole of a compound, scientists add together the??? Since this is not my area of expertise, I searched Google under the key words "find mass mole" to get these possible sources:

    asked by sally
  32. meiosis

    In humans, one pair of autosomes (chromosome 4) has a short arm and a long arm. On the short arm is a gene for Huntington disease(H) and on the long arm is a gene for red hair(R). I have to draw a labelled diagram to show the chromatids of a diploid cell

    asked by Anonymous
  33. social studies

    what would happen if people stop spending money on luxuries? The economy would worsen. How would businesses get money if no one spent any? People also would get into bankruptcy as often and would have larger savings accounts. They might also spend more

    asked by Anonymous
  34. science

    What is the equation of the hydrolysis of lactose?

    asked by laura
  35. history

    The Korean War, Cold War, and Vietnam war were mainly about fighting communism. Would you say WWII was also? WW11 was not about Communism. I am not sure that Korea or Vietnam were about Communism either. The Chinese were not involved in the Korean war

    asked by Fidelia
  36. science

    Explain the meaning of the term 'regulating mortality factor', also how can an understanding of this lead to a suucessful biological control of pests in agriculture and horticulture.

    asked by laura
  37. science

    With reference to lactose explain the meaning of the phrase glycosidic C-1 to C-4 linkage The linkage refers to the #1 and #4 carbons in the rings as shown in the diadram.

    asked by laura
  38. Safety

    Where does Occupational Safety originally come from? How/where in the world or human history did it start? Must have references! Thank you (Broken Link

    asked by Ashley
  39. Math

    hollis is paying off 2 student loans. One loan charges 7% interest, per year. The other loan charges 9 % interest per year. He owes $1500 more on the 7% loan than he does on the other. Last year he paid a total of $617.00 in interest. what does he owe on

    asked by Edward

    WHAT MAKES ONE SOURCE MORE TURUSTWORTHY OR CREDIBLE THAN ANOTHER? WHAT QUESTION DO YOU ASK WHEN EVALUTING A SOURCE, AND WHY The expertise and objectivity of the author make a source trustworthy and credible. When evaluating a source, ask who wrote it, what

    asked by LATUNJA JONES
  41. chemistry

    i have to decide which one is more polar by using an arrow. 1. N-H 2. O-F 3.C-O Look up the electronegativity on a chart and take the difference between the two elements. The larger the difference the more polar.

    asked by hayley
  42. project menagement

    Put together a proposal for the customer that includes the following: Briefly describe the first five points of the project scope checklist in relation to the project: what are the project objectives:? list the deliverables. identify the milestones of the

    asked by dre
  43. Science

    I need help unscrambling this sentence, it is a fact about force. fox enters pine den crosswise This one is a fact about work. domestic rice skin software Please Help!!! Thank you need help unscrambling this sentence, it is a fact about force. fox enters

    asked by Danielle
  44. Science

    I hope someone can help, Thank You! The wheels of a machine are identical. They have an outer circumference of 10 cm and an inner circumference of 5 cm. If the crank is rotated one quarter turn clockwise, where will the clock's hand point? More information

    asked by Danielle
  45. Science

    What do all the words in the left hand cloumn have in common that is not shared by any of the qords in the right column? Thanks i hope you could help!! plus this too, i forgot to type it in ramp hammer screw faucet chisel axle doorstop hinge With only a

    asked by Danielle
  46. decision making

    I am having trouble finding an example from a business, news reports, government, economics, or etc. where the decisions made produced a negative consequences. I just need some references to do some research from. Any help would be greatly appreciated.

    asked by Jo
  47. Elem. Ed.

    Which would be a way for a teacher to help students learn about aesthetics in an appropriate way? 1. creating a sensory-rich enviroment (or) 2. exposing children to convegent ideas creating a sensory rich enviroment would be the best appropriate way. Am I

    asked by Keisha
  48. physics

    Zero, a hypothetical planet, has a mass of 3.0*10^23 kg, a radius of 3.0*10^6 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0*10^7 J, what will be

    asked by ben
  49. english

    Okay, I am writing an 'I am a..' metaphor poem, and i cannot think of anything. I have tried to get my family to help, but they are completley useless. Please help me! Its due tomorrow! Are you a chameleon who changes in a different environment? ferocious

    asked by Jami
  50. Poem Help Needed

    This is a poem by John Berryman that I am supposed to analyze and I am completely confused by. If anyone has any observations or ideas about the main idea of the poem, PLEASE help me out! "The Traveller" They pointed me out on the highway, and they said

    asked by Belinda
  51. Chemistry

    How do I find the molarity of NaCl for different dilutions? You calculate the number of moles per liter of solution.

    asked by Colleen
  52. Early Childhood Ed.

    When a teacher shows children how to do a sponge painting with geometric shapes and then shows pictures of geometric shapes during group time,the teacher is probably using art to: A. create seat work B. discourage child-directed activities C. teach each

    asked by Keisha
  53. Physics

    The Mariana trench is located in the Pacific Ocean at a depth of about 11500 m below the surface of the water. The density of seawater is 1025 kg/m3. (a) If an underwater vehicle were to explore such a depth, what force would the water exert on the

    asked by Mary
  54. Physics please check

    A person who weighs 655 N is riding a 98 N mountain bike. Suppose the entire weight of the rider and bike is supported equally by the two tires. If the gauge pressure in each tire is 8.70 X 10^5 Pa, what is the area of contact between each tire and the

    asked by Mary
  55. social studies

    how did marius change the roman army?

    asked by ashley
  56. Homeownership PLEASE HELP

    Hi I KNOW this isnt a homework question but what is the legal age to own a home? is it 18 or 21? I was told its 21 but it doesnt make sense to me.why cant you be 18? I really need to know. It may depend on where you live but your credit line starts when

    asked by Terry
  57. Physics

    A bottle of juice is sealed under partial vacuum, with a lid on which a red dot or "button" is painted. Around the button the following phrase is printed: "Button pops up when seal is broken." Explain why the button remains pushed in when the seal is

    asked by Mary