Shadow

Newest questions and responses by Shadow
  1. Physics

    A playground is on the flat roof of a city school, hb = 5.70 m above the street below (see figure). The vertical wall of the building is h = 6.90 m high, to form a 1.2-m-high railing around the playground. A ball has fallen to the street below, and a

    asked on December 15, 2018
  2. JAVA

    Using only one "System.out.print" command, print the following quote. Make sure to include the quote marks (") in your output. "I do not fear computers. I fear the lack of them." Isaac Asimov

    asked on December 14, 2018
  3. Math

    Emilio has 8450 trees to plant in rows on his tree farm he will plant 125 trees per row how many full rows of trees will he have explain

    asked on May 8, 2018
  4. math

    Match the term with it's meaning real numbers irrational numbers rational numbers integers whole numbers natural numbers radical square root perfect squares cube roots terminating decimals repeating decimals truncate radicand a decimal which can be

    asked on April 17, 2018
  5. Social Studies

    Why did the United States become involved in Mexico's civil war? Select all that apply. 1)Relations had weakened between the United States and the new government. 2)Mexico was unable to end the war without U.S. intervention. 3)The United States provided

    asked on February 1, 2018
  6. social studies

    Which factor best accounts for the price change in the Model T automobile? A. Low deman B. Orginized labor C. Mass production D. wartime inflation

    asked on December 16, 2017
  7. math

    What is the surface area of the given figure. A.) 1,008 cm B.) 1,728 cm C.) 1,392 cm D.) 1,216 cm

    asked on December 5, 2017
  8. math

    which solid does the net form? hexagonal prism hexagonal pyramid rectangular prism rectangular pyramid

    asked on December 5, 2017
  9. math

    sara needs to cover the top and sides of the cylinder below About how many square inches of paper will Sara need? 528 in. 415 in. 207 in. 179 in.

    asked on December 5, 2017
  10. science

    A powerpoint about four landforms

    asked on November 14, 2017
  11. social studies

    Which of the following laws would the free-soil party have supported? cottonocracy slave codes wilmot proviso fugitive slave act ms sue i don't want a link

    asked on November 13, 2017
  12. Language

    I have to write a essay and I don't know how to lengthen the rough draft could someone please give me tips? Here's my rough draft Comparison-and-Contrast Essay The Story-Teller and The Drummer Boy of Shiloh Comparison and Contrast means to tell the

    asked on November 10, 2017
  13. social studies

    Which of the following best describes the similarity between emerson's and thoreau's central beliefs? A.They both lectured on the importance of the inner light B.they both believed the human spirit was reflected in nature C.they both considered the rise of

    asked on November 3, 2017
  14. social studies

    We hold these truths to be self-evident: that all men and women are created equal; that they are endowed by their creator with certain unalienable rights; that among these are life, liberty, and the pursuit of happiness what founding documents is being

    asked on November 3, 2017
  15. social studies

    what is this drawing of a camp meeting likely illustrating? A. the growth of reform movements in the united states B. the large influence revivals had on americans C. the rise in the formation of women's trade unions D. the increase in support of american

    asked on November 2, 2017
  16. social studies

    How did Horace Mann contribute to the reform in education? A. His development of books with raised letters aided in the education of the blind B. His educational philosophy led to a new approach in educating the deaf C. His radical call for classroom

    asked on November 2, 2017
  17. social studies

    How did horace mann feel that reforming the american educational system was important? A. it would help people attain better jobs B. it would help in the fight to end slavery C. it would help in the fight for gender equality D. it would help people become

    asked on November 2, 2017
  18. science

    where does energy come from in north carolina

    asked on November 1, 2017
  19. educational technology

    5-7 sentences about the progressive era

    asked on October 31, 2017
  20. social studies

    why does the cartoon from the bank war 1832 portray president jackson as a king? A many people felt he was motivated by his own wealth B some felt he had used his power inappropriately in vetoing legislation to recharter the bank C some felt there remained

    asked on October 20, 2017
  21. math

    Solve the following proportion x/3 = 6/9 A 18 B 27 C 2 D 24

    asked on October 17, 2017
  22. math

    Solve the following proportion x/3 = 8/9 A 18 B 27 C 2 D 24

    asked on October 17, 2017
  23. social studies

    Why did Jefferson oppose Hamilton’s plan for creating a national bank? Select all that apply. (2 points) He argued that Congress did not have the constitutional power to establish it. He felt that there would be no way to effectively run a national

    asked on October 4, 2017
  24. social studies

    Which of the following statements best summarizes Washington’s viewpoint on American foreign policy? (1 point) The United States can take advantage of Europe’s ambition. The United States should limit interaction with Europe to commerce, or trade.

    asked on October 4, 2017
  25. Math

    I need helppp D: ---------------- Simplify the expression -4-5(x+8) *-5x-44 *-5x+36 *-x-8 *-20x+8 5x+6(x-2)-8(x-3) *19x+36 *19x+12 *3x-36 *3x-12 x+8

    asked on October 3, 2017
  26. math

    If the relative change between the original price and the new price is 30% decrease, then the new price is ________% of the original price?

    asked on September 30, 2017
  27. math

    If a number is not a rational number, then it is _____. (1 point) a integer a rational number a whole number

    asked on September 26, 2017
  28. math

    Which of these nonterminating decimals can be converted into a rational number A 0.48907542 repeating B 0.02020202 repeating C 0.92589542 repeating D 0.10203040 repeating

    asked on September 26, 2017
  29. math

    find the length of the hypotenuse of a triangle with legs of 5 ft and 12 ft? 11 ft 13 ft 17 ft 60 ft

    asked on September 26, 2017
  30. social studies

    which of the following statements best reflects the rights of citizens that are protected by the bill of rights

    asked on September 21, 2017
  31. ELA

    Your assignment for this portfolio is to do the following: research the Victorian period in England. You can focus on work, schools, historical events, cultural details, or holiday traditions. Compare the Victorian period to modern day life.

    asked on May 7, 2017
  32. math

    5. 4, 12, 36, 108, . . . A. 304, 912, 2,736 B. 324, 972, 2,916 C. 354, 1,062, 3,186 D. 332, 996, 2,988

    asked on February 27, 2017
  33. science

    Earth's energy sources include both renewable and nonrenewable resources. name at least three sources of energy that could be used in your house. then describe the ideal energy source for generating most of your home's electricity, and explain why you

    asked on February 27, 2017
  34. Math

    A rectangular piece of fabric measures 37 by 45 inches. A triangular scarf with a height of 21 inches and a base of 25 inches is cut from the fabric. How much fabric is left over?

    asked on February 17, 2016
  35. Math

    1. What value for x makes the sentence true? 7x = 1 0 6 3 2

    asked on November 25, 2014
  36. Math

    The number p is the product of three different positive prime numbers greater than 2.If the sum of these three prime number is also prime, what is the smallest possible value for p? Won't the 3 number be 3-5-11? Thanks

    asked on May 21, 2014
  37. chem

    Calculate the amount of heat required to convert 17.5g of ice at -33.5∘C to steam at 100.0∘C.

    asked on April 23, 2014
  38. Calculus

    Find the position s as a function of time t from the given velocity v=ds/dv. Then evaluate the constant of integration so that s = s0 when, t = 0. 1. v = 3t2 , s0 = 4 I don't quite understand what the question is asking or what is s0 mean. Than

    asked on January 12, 2014
  39. Physic

    A horizontal force F pulls a mass m across the floor at constant speed a distance d. If the coefficient of friction between box and floor is u, the work done by the force F is. I know W= FD and Wf = umgd, but I don't understand what the question asking.

    asked on December 9, 2013
  40. chemistry

    In the following reaction, how many liters of carbon dioxide, CO2, measured at STP, would be produced from the decomposition of 143 g of magnesium carbonate, MgCO3? MgCO3----MgO+CO2

    asked on November 19, 2013
  41. chemistry

    Hydrogen gas can produced by the reaction between metallic aluminum and aqueous hydrochloric acid 2Al+6HCl----2AlCl3+3H2 Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes

    asked on November 19, 2013
  42. Physic

    An elevator weighing 2000 kg falls with a downward acceleration of magnitude (1/2)g . What is the tension in the supporting cable? I got the answer as 49000 N.

    asked on September 17, 2013
  43. Physic

    A car traveling 100 km/h is 200m away from a truck traveling 50 km/h (in the same direction). Assuming constant braking acceleration, what is the minimum deceleration the car must have if it is not to hit the truck? Can someone hint me on how I can start

    asked on August 28, 2013
  44. Math

    Let say 5m x 5m, I know the answer is 25 m^2, but let say it was 25m / 5m, what would the answer be? I know it 5 but what the unit? Just 5m? Thanks

    asked on August 25, 2013
  45. Significant Figures

    The problem is 150 - 1 - 0.182 Since the least sig. fig. is 1 would the answer be 1 x 10^3 ?Thanks

    asked on August 23, 2013
  46. Math

    The problem I have to solve is log with base 2 ^6 multiply by log base 6 ^ 8. I use the change of base formula and got log6/log2 * log8/log6 Which become log6/log2 * log2()^3/ log 6 I'm stuck here thanks.

    asked on June 19, 2013
  47. Chemistry

    So I did a lab that consist of baking cookies and the mass of the final products isn't equal to the ingredients used. Could there be mass lost as gas ? What other factors might there be? Thanks

    asked on May 27, 2013
  48. Chemistry

    Find the polar coordinate of the following. (0,-6) I know r = sq.root of 6 but tan theta = -6/0 doesn't exist so how will I find the degree? Thanks

    asked on May 19, 2013
  49. Chemistry

    Find the enthalpy for : 4Fe + 3O2 = 2Fe2O3 I got the following informations: Fe + 3H2O = Fe(OH)3 + 3/2H2 - Enthalpy is 160.9 kj H2 + 1/2O2 = H2O - Enthalpy is -285.8 kj Fe2O3 + 3H2O = 2Fe(OH)3 - Enthalpy is 288.6 I try using Hess Law but cannot solve it.

    asked on May 13, 2013
  50. Chemistry

    Name the compounds CH3CH2CHCH2CH3 - Is this 3-Pentane? Thanks

    asked on May 10, 2013
  51. Chemistry

    How much water must be added to 6 mL of a 0.05M stock solution to diltue it to 0.02M ? The answerI got is 15 mL. Is this correct? Thanks

    asked on April 19, 2013
  52. Math

    Is 2Cos x the same thing as Cos^2 x? Thanks

    asked on April 7, 2013
  53. Precalculus

    Verify the identities. Cos^2x - sin^2x = 2cos^2x - 1 When verifying identities, can I work on both side? Ex. 1 - sin^2x - sin^2x = 1 - 2sin^2x 1 - 2sin^2x = 1 - 2sin^2x

    asked on April 4, 2013
  54. Chemistry

    If 3.21 mol of a gas occupies 56.2 L at 44*C and 793 torr, 5.29 mol of this gas occupies __________ L under these conditions. . -How will I solve this using PV= nRT? I tried using PV= nRT. By just plugging in the value and got 131 but the answer is around

    asked on April 2, 2013
  55. Chemistry

    Does mass affect pressure? I understand volume, and temperature does but not sure about mass. If I have a gas with mass 15 g, wont this exert less pressure than a gas have a mass of 30 g?

    asked on April 1, 2013
  56. Chemistry

    Calculate the grams of oxygen gas present in 2.5 L sample kept at 1.66 atm pressure and a temperature of 10 C. - I got 5.72 grams Determine the volume of oxygen gas needed to completely combust 0.202 L of Butane(C4H10). -I got 1.31 L O2. -Thanks

    asked on April 1, 2013
  57. Chemistry

    The temperature of oxygen is 810 torr at 298 K , what will the pressure be at 330 K? Using Lussac's Law, would the answer be 896.98 torr? Thanks

    asked on March 31, 2013
  58. Chemistry

    Determine the volume of methane CH4 gas needed to react completely with 0.660 L of 02 to form methanol CH3OH I'm confused because I'm sure CH4 + O2 don't give you CH3OH. Thanks

    asked on March 29, 2013
  59. Chemistry

    Do elements with higher masses always have lower average velocity than those elements with a low mass? Thanks

    asked on March 12, 2013
  60. Chemistry

    I had to find the root mean square velocity of a gas using the only formula KE=1/2MV^2 . Is this even possible using only this formula?

    asked on March 11, 2013
  61. Chemistry

    I had to find the root mean square velocity of a gas using the only formula KE=1/2MV^2 . Is this even possible using only this formula?

    asked on March 11, 2013
  62. Chemistry

    Water has an extremely high boiling point compared to other compounds of similar molar mass because of ? Hydrogen Bond Adhesive force Covalent bonding Dispersion Forces I believe the answer is A since hydrogen bond is a strong bond and thus require most

    asked on March 11, 2013
  63. Precaculus

    tan4.7 * cot4.7 I understand tan4.7 = 1/ cot 4.7 but I'm stuck after this thanks.

    asked on March 7, 2013
  64. Chemistry

    What are the attractive forces that increase surface tension? -Would it be cohension and adhension? Thanks

    asked on March 6, 2013
  65. Math

    How would I solve this part of the Fibonacci sequence piecewise function? f(n) = f(n-1)+f(n-2) if n > 1. Thanks

    asked on March 3, 2013
  66. Chemistry

    4Fe + 3O2 = 2Fe2O3 So in math book it say " You can interpret this equation in terms of representative particles by saying that four atoms of iron react with three molecules of oxygen to produce two formula unit of iron(iii) oxide" Why it say that there

    asked on February 24, 2013
  67. Chemistry

    I need to write a balance equation of the decomposition of aluminum carbonate. I know the starting "reactant" is Al2(CO3)3 but would the "product' be 2Al + 3(CO3) ? Thanks

    asked on February 19, 2013
  68. English

    Is there a present and past tense of "is" and "are" ? Or it is just how they're used in the sentence that make them past/present tense? Thanks

    asked on February 18, 2013
  69. Chemistry

    If I have 50 mL of Lead(II) Nitrate, it is possible for me to calculate how many mole is 1 mL of the substance? Thanks

    asked on February 18, 2013
  70. Chemistry

    Because the mass of the reactants equal to the mass of the product of a reaction, the number of moles will be conserved. -I think this is sometime true but I don't know a way to prove that it sometime true. Anyone got an idea ? Thanks

    asked on February 11, 2013
  71. Math

    Solve the piece wise function when f(17) f(x) = f(x-3)+2 if x > 10 -5 if x

    asked on February 10, 2013
  72. Chemistry

    A mole of a pure substance contains 6.02x10^23 atoms. Alway true, sometime true or never true? -I was thinking sometime true since a pure substance can be like H2O but H2O have 3 "atoms" (Is this what you call individual part of H2O?). Each "atoms" have

    asked on February 5, 2013
  73. Chemistry

    If 25 grams of copper(II) sulfate pentahydrate were heated until all water was removed, how much residue would remain?- Could someone help me understand this question? I don't understand it at all. Thanks

    asked on February 3, 2013
  74. Chemistry

    Is there a chemical formula for animal fats? - Would the lipids chemical formula be the same as animal fats? Thanks

    asked on February 3, 2013
  75. Chemistry

    I did a lab that involve cooking meat and finding the mass of lipids, meat tissue and water. For a chicken sample the original mass was 20 gram. After cooking there was 15.5g of meat, and 1.5 g of oil, and 1 g of water. I am missing 2 g of the original

    asked on February 3, 2013
  76. Chemistry

    The problem ask what is the mass of iron(iii) chloride contains 2.35 x 10^23 chloride ions. I understand the molar mass is 162.20 g/mol. - 2.35 x 10^23 chloride ions would be around 0.39 moles. - The work that my teacher gave me is 0.39 moles * (1 mol

    asked on January 30, 2013
  77. Chemistry

    How many moles of ion are in the following? A. 0.0200 g AgNO3 - Could someone give me the step to solve such problems? Thanks

    asked on January 30, 2013
  78. Chemistry

    Is this true or false? Thanks A mole of CCl4 is composed of one atom of carbon and four atoms of chlorine. I put false because it contain one mole of C 4 mole of Cl. Each mole have more than one atoms. Thanks

    asked on January 29, 2013
  79. Chemistry

    Let say Pb(NO3)2 combine with FeCl3, would this yield PbCl + Fe(NO2)3? Thanks

    asked on January 28, 2013
  80. Language Art

    I'm currently doing a project and need a physical object to represent "racism". Anyone have a suggestion of such item? Thanks

    asked on January 26, 2013
  81. Math

    The metric ton of CO2 product per gallons of gas can be calculated with the following. 8.78 x 10-3 metric tons of CO2 are emitted per gallon of gas. Let say the gallon of gas is 1288. Would the CO2 produced be around 11.3 tons? Thanks

    asked on January 22, 2013
  82. Chemistry

    Let say you were given this equation: NiBr2 + Co = Ni + CoBr2 How can you tell which is liquid,gas,solid,aqueous? Do you just use what you know and figure it out? Like since NiBr2 can be broken down because of the solubility rule, you can assume it aq then

    asked on January 14, 2013
  83. Chemistry

    I need to write the total ionic equation for this equation. Copper(ii)sulfate + iron = iron(iii)+ copper. Won't it be Cu2+ + SO4-2 + Fe = Fe3+ + Cu ? The answer key say 3Cu2+ + 3SO4-2 + 2Fe = 2Fe3+ + 3SO4-2 + 3Cu Where did they get the sulfate for the

    asked on January 14, 2013
  84. Chemistry

    H2O2 + Heat = H2O + O2 Would this be combustion or decomposition? Since the products are H2O and O2, I thought it would be combustion but then H2O can be decompose into H2O and O2 which would be decomposition.

    asked on January 14, 2013
  85. Science

    Could anyone link or tell me why does oxygen ignite at high temperature? Thanks

    asked on January 14, 2013
  86. Sicnece

    A skeleton equation is not a balanced equation.- Is this sometime true, never true or always true? Can't there be some skeleton equation that is already balanced, thus it sometime true? Thanks

    asked on January 9, 2013
  87. Chemistry

    Would this be a double or single replacement and why? Thanks Na2O2 + H2O -> NaOH + O2 Would it be single since the Na is pair with H?

    asked on December 19, 2012
  88. English

    I'm not a native speaker of English so I have grammar problems. What are some ways that I can improve my grammar? Do reading grammar book help? Also, is there any way to improve my writing beside writing more? Thank you

    asked on December 18, 2012
  89. Chem:DrBob

    Thank you for the informative answer yesterday. I hope you can help me with this one too. Thanks S(subscript 8) + O( subscript 2) -> SO3 Could you explain why it O3 when S valence is -2? Thanks

    asked on December 18, 2012
  90. Chemistry

    I'm currently learning about balancing chemical equation but I don't understand the equation below. 2FE + 3CL(subscript 2) -> 2FECL(subscript 3) I understand 2FE balance out but how did 3CL2 became CL3? Thanks

    asked on December 17, 2012
  91. Chemistry

    Find the energy( in KJ) of a wave with the wavelength of 507 nm. First, I turn the 507 nm into meter then divide the speed of light by it which give me the frequency. Then I take the frequency and multiply by the planck. Then I would convert the Joule to

    asked on November 7, 2012
  92. Chem:DrBob

    Dr.Bob, yesterday you told me : "The best way I think is to show examples. 12Mg = 1s2 2s2 2p6 3s2 Here the 1s orbital is lower than the 2s and they are lower than the 3s etc." 19K = 1s2 2s2 2p6 3s2 3p6 3d0 4s2 Here the 1s is lower than the 2s and those are

    asked on November 6, 2012
  93. Chemistry

    Is this always true, sometime true, or never true? The orbitals of a principal energy level are lower in energy than the orbitals in the next higher principal energy level. -I'm thinking sometime true but I can't figure out how to explain why it sometime

    asked on November 6, 2012
  94. Math

    Is there a way to simplify this further? Thanks (√ x + √ y) / x^2+y^2 ( Square root of x plus square root of y) All divided by x^2+y^2.

    asked on September 21, 2012
  95. Chemistry

    Could someone give me the steps to converting using the metric system scientific notation? For example, how would I convert 2.2 x 10^2 cm to km? Thanks ( I try Google but they only teach how to convert it when it not in scientific notations form)

    asked on September 18, 2012
  96. Chemistry

    Could someone tell me how to use SI prefixes to convert within the SI unit system or link me to a website that teaches this? Thanks

    asked on September 18, 2012
  97. Math

    Rounds each number to four significant figures. ( Could someone check if I'm right? Thanks) a. 431801 = 4318 b. 10235.0 = 1024 c. 1.0348 = 1.035 d. 0.0004384010 = 0.0004384 e. 0.00078100 = 0.0007810 f. 0.0098641 = 0.009864

    asked on September 12, 2012
  98. Science

    Could someone help me list 15 thing that are not matter? Thanks

    asked on September 5, 2012
  99. Microsoft Word

    Is is possible to do this? It a requirement by my teacher but I just can't seem to do it. " singled space text within questions and double space between your questions".- If I single space the text within the questions, won't that make it single space

    asked on May 16, 2012
  100. Math

    What positive value of b makes 9^2-bx+4 a perfect square trinomial? How would you solve this problem? Thanks

    asked on March 26, 2012

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