Most popular questions and responses by andrea
  1. English

    After which type of assessment will you be asked to set goals for yourself?

    asked on January 5, 2017
  2. physics

    The two angled ropes used to support the crate in the figure below an withstand a maximum tension of 1300 N before they break. The left angle is 30dregres, and the right angle is 45degrees. What is the largest mass the ropes can support? m=?

    asked on September 20, 2010
  3. Physics

    the speed of the train is reduce uniformly from 15m/s to 7m/s while travelling a distance of 90m. a) compute the acceleration b) how much further will the train travel before coming to rest provided the acceleration remain constant.

    asked on December 19, 2011
  4. Chemistry

    Balance the equation and write the reaction-quotient expression, Qc. U(s) + F2 (g) UF6 (g)

    asked on October 15, 2012
  5. Math

    the stopping distance of an automobile is directly proportional to the square of its speed v. a car required 90 feet to stop when its speed was 70 miles per hour. find a mathematical model that gives the stopping distance d in terms of its speed v. D=

    asked on February 23, 2018
  6. physics

    Which of the following statements about work is or are true? (More than one statement may be true.) A. Negative net work done on an object always reduces the object's kinetic energy. B. If the work done on an object by a force is zero, then either the

    asked on February 22, 2011
  7. math

    There is something wrong with this definition for a pair of vertical angles: “If AB and CD intersect at point P, then APC and BPD are a pair of vertical angles.” Sketch a counterexample to show why it is not correct. Can you add a phrase to correct it?

    asked on September 15, 2013
  8. Physics

    a ball is released from rest and rolls down in an inclined plane, requiring 4 sec. to cover a certain distance of 100m. a) what is the acceleration? b) how many cm would it have fallen vertically in the same time?

    asked on December 19, 2011
  9. earth

    HELP? Two students are given cubic boxes, measuring 10 cm on a side. Robert puts a single glass marble with a diameter of 10 cm in the box. Susan puts 1,000 1-cm glass marbles in her box. 1.Whose box has more empty space? Explain. 2.Whose box will be

    asked on November 14, 2012
  10. physics

    a person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18 ms. The cliff is 52m above the waters surface. How long does it take for the stone to fall to the water? With what speed does it strike the water?

    asked on January 14, 2010
  11. chemistry

    Copper used in electric wires comes in two flavors (isotopes): 63Cu and 65Cu. 63Cu has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. The average atomic mass between these two isotopes is

    asked on October 31, 2016
  12. physics multiple choice

    A worker pushes horizontally on a 2000 N refrigerator on a kitchen floor with a force of 28.0 N. A. If the refrigerator moves forward, this person feels it pushing back with less than 28.0 N. B. The person always feels a 28.0 N push from the refrigerator.

    asked on February 2, 2011
  13. science

    Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3:1. If the allele are designated (R & r) respectively, what is the probable genotypes of the wrinkled seeds which were produced

    asked on February 15, 2008
  14. Physics

    a bomb is dropped from an airplane travelling horizontally with a speed of 300 mi/hr if the airplane is 10000ft. above the ground, how far from the target must it be released, neglect friction?

    asked on December 19, 2011
  15. math

    Bill Spread, owner of the Bedding Shop, knows that his customers will pay no more than $300 for a comforter. Assume Bill wants a 30% markup on selling price. What is the most he could pay the manufacturer. for thid comforter?

    asked on November 20, 2011
  16. AP Chemistry

    Which of the following bonds is the most polar? A. C-F B. C-C C. C-O D. C-N I was originally going to pick C-F because F is the most electronegative, but I'm not so sure. Help?

    asked on December 17, 2017
  17. physics

    A 30 kg child slides down a playground slide at a constant speed. The slide has a height of 3.8m and is 7.8m long. using energy considerations, find the magnitude of the kinetic friction force acting on the child.

    asked on November 5, 2010
  18. Gen Chem

    ignition of mgnh4po4*6h2o produces nh3, h2o and magnesium pyrophosphate, Mg2P2O7. complete and balance the equation for this reaction. If 5.00 g of MgNH4PO4*6H2O are ignited, how many grams of Mg2P2O7 would be formed? 2MgNH4PO4*6H2O(g)--->

    asked on October 23, 2012
  19. AP Chem

    Which molecule has the strongest intermolecular forces? A. HOCH2CH2CH2OH B. CH3CH2CH2OH C. CH3CH2CH2CH3 D. HOCH2CHOHCHOHCH2OH I'm pretty sure it's C.

    asked on February 19, 2018
  20. chemistry

    treatment of a 0.400g sample of impure potassium chloride with an excess of AgNO3 resulted in the formation of 0.733g of AgCl. calculate the percentage of KCl in the sample. show balanced equations in support of your answer

    asked on August 15, 2012
  21. Physics

    A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20×10^4 Pa, while in the region of blockage it is

    asked on November 12, 2008
  22. Linguistics

    What are three different ways an English speaker might make the borrowed Polish place name Szczebrzeszynie[ʃtʃɛbʒɛʃɨɲɛ]fit within English phonotactics?

    asked on September 27, 2017
  23. Physic

    What is the period of revolution of a satellite with mass m that orbits the earth in a circular path of radius 7820 km (about 1450 km above the surface of the earth)?

    asked on July 10, 2010
  24. physics

    A Ferris wheel with radius 14.0 m is turning about a horizontal axis through its center, as shown in the figure below. The linear speed of a passenger on the rim is constant and equal to 6.00 m/s. A.What is the magnitude of the passenger's acceleration as

    asked on February 2, 2011
  25. physics

    Two balls having different masses reach the same height when shot into the air from the ground. If there is no air drag, which of the following statements must be true? (More than one statement may be true.) A. Both balls left the ground with the same

    asked on February 22, 2011
  26. trig

    The terminal side of θ lies on a given line in the specified quadrant. Find the values of the six trigonometric functions of θ by finding a point on the line. Line: (55/48)x Quadrant:III sin(θ)= cos(θ)= tan(θ)= csc(θ)= sec(θ)= cot(θ)=

    asked on January 31, 2012
  27. chemistry

    The height of a stack of 5 pennies is 0.72 cm and the radius of the stack is 0.91 cm. The volume in mL of this stack of 5 pennies is...

    asked on August 30, 2012
  28. physics

    A block slides a distance d down a frictionless plane and then comes to a stop after sliding a distance s across a rough horizontal plane. What fraction of the distance s does the block slide before its speed is reduced to one-third of the maximum speed it

    asked on February 22, 2011
  29. physics

    A 40%-efficient car engine accelerates the 1300 kg car from rest to 20 m/s How much energy is transferred to the engine by burning gasoline? .

    asked on November 13, 2010
  30. chemistry

    a carbon containing 3 atoms of carbon and 8 atoms of hydrdren combinend in reactionwith oxygen molecules the 2 end products of this equation are carbon dioxide co 2 an water what element should i look at first inn this oxygen hydrogen carbon or dioxide and

    asked on May 12, 2008
  31. Math 6th grade

    Mr.Baker has baked some muffins. If he packs them in boxes of 4, he will have 3 left over. If he packs them in boxes of 5, he will also have 3 left over If he packs them in boxes of 6, he will have only 1 left over. Find the least possible number of

    asked on September 19, 2016
  32. Physics

    A 2.1kg brass ball is transported to the Moon. a)What is the mass of the brass ball on the earth and on the moon? Wouldn't it be 2.1kg for the earth as well as for the moon? b)Determing the weight of thee brass ball on the earth. F_g=(G*m_ball*m_earth)/r^2

    asked on November 12, 2007
  33. chemistry

    a compound containing 3 atoms of carbon and 8 atoms ofhydrgen is combined in a reaction with oxegyn molecules the two end products of this equation are carbon dioxide co 2 and water what elemement should i look at first in balancing this equation oxygen

    asked on May 12, 2008
  34. Physics

    Europa, a moon of Jupiter has an orbital diameter of 1.34x10^9m and a period of 3.55 days. What is the mass of Jupiter? d=1.34x10^9m T=3.55days = 30672s M=? r=71492000m rm=6.7x10^8 r-total=7414492000m r^3/t^2=GM/4pi^2

    asked on November 12, 2007
  35. Physics

    A playground merry-go-round of radius R = 1.92m has a moment of inertia of I = 221kgm^2 and is rotating at 14.0rev/min about a frictionless vertical axle. Facing the axle, a 29.8kg child hops onto the merry-go-round and manages to sit down on its edge.

    asked on July 5, 2016
  36. Physics

    A lever is 5m long. The distance from fulcrum to the weight to be lifted is 1m. If the worker pushes on the opposite end with 400N, what is the max weight that can be lifted? l=5m h=1m F=400N F_g=? torque=F_g*l I first must find torque so that I can plug

    asked on November 7, 2007
  37. history

    What would be a good legal question for the case Board of Education v. Earls case and a good answer for the question? This is suppose to be for my homework and it is due tomorrow! I need help immediately so I need to know an answer right now. :(

    asked on November 18, 2018
  38. Chemistry

    A sample of oxalic acid (H2C2O4, with two acidic protons), of volume 37.09 mL was titrated to the stoichiometric point with 22.41 mL of 0.163 M NaOH(aq). What is the molarity of the oxalic acid? Answer in units of M.

    asked on May 29, 2016
  39. Math

    Brian's boat has a top speed of 9 miles per hour in still water. While traveling on a river at top speed, he went 10 miles upstream in the same amount of time he went 20 miles downstream. Find the rate of the river current.

    asked on April 14, 2014
  40. Math

    Luis had 8/10 meter of wood for the frame thqt he is doing. His father gave him 1/4 meter more.How many meters of wood that he have now?

    asked on September 26, 2017
  41. Physics

    A block of mass m1=1.6kg, initially moving to the right with a velocity of +4m/s on a frictionless horizontal track, colides with a massless spring attached to a second block of m2=2.1kg moving left with a velocity of -2.5m/s. The spring constant is 600

    asked on June 5, 2013
  42. College Statistics 2

    I saw that this was already answered but I can't find it if anyone knows, can you point me in the right direction? A recent poll of 700 people who work indoors found that 278 of them smoke.If the researchers want to be 98% confident of thier results to

    asked on January 28, 2009
  43. math

    Everett made 3/5 of the baskets he shot. Suppose he shot 60 baskets. How many did he make?

    asked on September 17, 2013
  44. Urgent!!! Physics

    At an air show, a jet plane has velocity components Vx = 625 and Vy = 415 at time 3.85s and Vx = 838 and Vy = 365 at time 6.52s . A. For this time interval, find the x component of the plane's average acceleration in km/h2. B. For this time interval, find

    asked on January 26, 2011
  45. medical billing and coding

    Your search for This 82-year-old female was admitted for acute exacerbation of chronic obstructive pulmonary disease. The progress notes indicate that the patient received a transfusion for anemia. The discharge diagnoses state acute exacerbation of

    asked on August 24, 2012
  46. physics

    A meterstick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with those two fingers. You can calculate your reaction time from the distance the meterstick falls,

    asked on January 26, 2011
  47. math

    Graph a circle that has its center at (0,0) and passes through (2,2). Please help ASAP!!! :( I don't know how to do this!!!

    asked on May 29, 2019
  48. math

    The formula for the lateral surface area of a cone is A=πr√(h^2+r^2). (A)Solve for r and simplify the result, if possible. (B) If the lateral surface area of a cone is 10 square feet and the height is 16 inches, what is the radius of the cone in inches?

    asked on April 24, 2018
  49. Physic

    A bowling ball weighing 71.2 N is attached to the ceiling by a 3.60 m rope. The ball is pulled to one side and released; it then swings back and forth like a pendulum. As the rope swings through its lowest point, the speed of the bowling ball is measured

    asked on July 10, 2010
  50. calculus

    A ship, proceeding southward on a straight course at the rate of 12 miles/hr is, at noon, 40 miles due north of a second ship, which is sailing west at 15 miles/hr. a) How fast are the ships approaching each other 1 hour later? b) Are the ships approaching

    asked on February 27, 2016
  51. math

    The volume of a sphere of radius r is V=4/3πr^3.Solve for r.

    asked on April 12, 2018
  52. Economics

    Clem Oatley could grow wheat and barley. He could grow 75 bushels of wheat or 125 bushels of barley using the same resources on an acre of his land. The price of wheat is $2.00 per bushel and the price of barley $ 0.80. Show the benefits to Clem from

    asked on February 10, 2015
  53. Sociology

    explain how "veiled reporting" may result in underreporting of gay and lesbian subjects in survey research. PLEASE HELP ASAP!!!! :(

    asked on March 4, 2019
  54. science

    If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

    asked on April 18, 2013
  55. English- edit my essay please?

    The Great Gatsby Mortality is something we will all face at some point in our life. However, I doubt many people will deal with it in the same light as James Gatz did. He died once in his youth, at the age of seventeen, only to be reborn again as someone

    asked on December 16, 2012
  56. Physics

    The pulley system shown in the figure is used to lift a 37 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are

    asked on October 25, 2012
  57. Gen Chem

    epsom salts, household ammonia, and rubbing alcohol are also consumer chemicals that could be used in this experiment. what are the chemical formulas for these substances?

    asked on October 22, 2012
  58. Physics

    A 50kg skier starts from rest from the top of a 100m slope. What is the speed of the skier on reaching the bottom of the slope? Neglect friction. would i do this: =PE + KE =mgh +1/2mv^2 =50(10)(100) + 1/2 (50)v^2 =50000 +25v^2 =2000 =v^2 44.7m/s =v Is this

    asked on October 16, 2007
  59. Chemistry

    If the reaction 2H2O2 →2H2O+O2 has a 45% yield, what is the molarity of the H2O2 solution if 2.5 L of this solution pro- duces 150 g of O2?

    asked on May 29, 2016
  60. calculus

    Sand is falling into a conical pile so that the radius of the base of the pile is always equal to one half its altitude. If the sand is falling at the rate of 10 cubic feet per minute, how fast is the altitude of the pile increasing when the pile is 5 feet

    asked on February 27, 2016
  61. chemistry

    when 45g of an alloy is dropped into 100.0 g of water at 25c, the final temperature is 37c. what is the specific heat of the alloy

    asked on May 19, 2010
  62. Business Studies

    Discuss the suitability of the various sources of finance a large business might use when replacing old machinery.

    asked on April 29, 2009
  63. Physics

    Europa, a satellite of Jupiter, appears to have an ocean beneath its icy surface. Proposals have been made to send a robotic submarine to Europa to see if there might be life there. There is no atmosphere on Europa, and we shall assume that the surface ice

    asked on November 18, 2008
  64. Chemistry

    A mixture of lead, magnesium, nitrate and chromate ions are present in a solution. What will the precipitate be?** a) MgPb b) Pb(NO3)2 c) PbCrO4 d) MgCO3

    asked on May 15, 2012
  65. Chemistry

    Classify the following 3 acids in order of increasing acidity: Acid 1:Ka = 8 x 10-6
 Acid 2:Ka = 6 x 10-4
 Acid 3:Ka = 9 x 10-11

    asked on May 13, 2012
  66. statistics

    The assets(in billions of dollars) of the four wealthiest people in a particular country are 43,25,21,15 assume that samples of size n=2 are randomly selected

    asked on February 10, 2014
  67. math

    Carla the baker worked four hours to make cookies. She ended with 380 cookies altogether. Write an equation to express how many cookies Carla made each hour.

    asked on March 28, 2018
  68. math

    A baseball team plays in a stadium that holds 66000 spectators. With the ticket price at $12 the average attendence has been 29000. When the price dropped to $9, the average attendence rose to 33000. Assume that attendence is linearly related to ticket

    asked on June 19, 2019
  69. Math

    Is the value of the second 5 in 450,852,137 one-tenth the value of the first 5 ? Explain

    asked on August 4, 2016
  70. chemistry

    which of the following is not acidic milk saliva softdrink or blood

    asked on May 12, 2008
  71. math

    A car was valued at $35,000 in the year 1995. The value depreciated to $12,000 by the year 2006. A)What was the annual rate of change between 1995 and 2006? (Round to 4 decimal places) B) What is the correct answer to part A written in percentage form?

    asked on June 23, 2019
  72. Chemistry

    Which of the following pairs of compounds will give a precipitate in a diluted solution?** a) Cu(NO3)2 and Na2CO3 b) KNO3 and NaCl c) MgCl2 and Ba(NO3)2 d) NH4Cl and Al2(SO4)3 A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the

    asked on May 15, 2012
  73. Chemistry

    Calculate the volume of Ba(OH)2 0.20 M necessary to neutralize 300.0 mL of H3PO4 0.30 M. (4 marks)

    asked on May 13, 2012
  74. Math

    A number cube is rolled 60 times. How many times would you expect to roll a 5?

    asked on May 18, 2011
  75. physics multiple choice

    A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present. What force is needed to push this crate along the same floor at a constant speed 3V if friction is the same as before? A. A constant force 3F

    asked on February 2, 2011
  76. Chemistry

    Acetic acid dissociates/ionizes itself as follows: CH3COOH(aq) ⇔ H+(aq) + CH3COO-(aq) If you add sodium acetate, CH3COONa, to the solution: a) a precipitate will be formed b) more acetic acid will be ionized c) the concentration of hydrogen ions will

    asked on May 15, 2012
  77. Help with maths!

    A rectangular field is surrounded by a fence on three of its sides, and a straight hedge on the fourth side. If the length of the fence is 320m, find the maximum area of the field enclosed. should i do it? Does it matter which of the 'three sides'

    asked on June 19, 2009
  78. math

    Find b and c so that y=-1x^2+bx+c has vertex (-5,-4). Please help ASAP I'm having a really hard time on this question!!!

    asked on June 15, 2019

    So this is what I have to do and I really don't get it. I've gotta describe ecological succession in terms of changes in the abiotic parts of an ecosystem. What do I do? Ecological succession refers to the changes that take place over time in the types of

    asked on July 7, 2010
  80. math

    A house was valued at $100,000 in the year 1987. The value appreciated to $165,000 by the year 2002. Use the compound interest formula S=P(1+r)^t to answer the following questions. A) What was the annual growth rate between 1987 and 2002? (Round to 4

    asked on June 26, 2019
  81. Chemistry

    Are the reactants or the products favoured in the following reactions? a. CH3COOH with NH3? b. HS- with HCO3-? c. HNO2 with NH3 d. NH4+ with F- e. C6H5COOH with CH3COO- f. H2SO3 with HCO3- g. H2CO3 with SO32- h. H2SO3 with SO32-

    asked on May 13, 2012
  82. chemistry 121

    Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred to other components of the food. As the water becomes hotter, so does the food. Suppose that the microwave radiation has a

    asked on March 26, 2010
  83. Math

    Socks are on sale 4 Pairs for $5. How much would you pay for 8 Pairs of socks?

    asked on October 20, 2015
  84. physics

    One end of a massless coil spring is suspended from a rigid ceiling. It is found that when a 4 kg mass is suspended from it the spring stretches 90 mm when the mass comes to rest. (a) What is the spring constant for the spring B)If the mass is then pulled

    asked on October 31, 2011
  85. Math

    On his last four tests, Danib scored 55%, 78%, 84% and 93%. What score should he get on his next text so that his average on all five tests are 80%?

    asked on May 23, 2018
  86. Chemistry

    Heating an ore of antimony (Sb2S3) in the presence of iron yields antimony and iron (II) sulfide. Sb2S3 + 3 Fe = 2Sb + 3 FeS When 15g of Sb2S3 reacts with 10g of Fe in the lab 9.84g of Sb is produced. What is the limiting reactant in this reaction? What is

    asked on April 20, 2013
  87. chemistry 121

    Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred to other components of the food. As the water becomes hotter, so does the food. Suppose that the microwave radiation has a

    asked on March 27, 2010
  88. math

    Because of the increase in traffic between Springfield and Orangeville, a new road was built to connect the two towns. The old road goes south x miles from Springfield to Freeport and then goes east x + 5 miles from Freeport to Orangeville. The new road is

    asked on November 21, 2018
  89. math

    The formula for the surface area of a cylinder is A=2πr^2+2πrh. (A)Solve for r and simplify the result, if possible. (B) If the surface area of a cylinder is 100 square feet and the height is 40 inches, what is the radius of the cylinder in units of

    asked on April 23, 2018
  90. chemistry

    isotope chromium -51 has a half life of 28 days. If the original sample had a mass of 28.0 grams, what mass of chromium -51 sample remains after 84 days?

    asked on December 11, 2014
  91. Chemistry

    If 5.86g of glucose are reacted and 1.44L of CO2 gas are collected at 293K and .984atm. What is the percent yield of the reaction? C6H1206 -> 2C2H5OH + 2CO2

    asked on October 17, 2010
  92. math

    A car was valued at $35,000 in the year 1990. The value depreciated to $10,000 by the year 2003. A) What was the annual rate of change between 1990 and 2003?(Round to 4 decimal places) B)What is the correct answer to part A written in percentage form?

    asked on June 23, 2019
  93. english composition

    what is the thesis statement in Why we crave horror movies?

    asked on October 11, 2008
  94. chemestry

    polycarbonate has a density of 1.2 g/cm3. a photo frame is constructed from two 3.00mm of polycarbonate.Each sheet measures 28 cm by 22cm. what is the mass of the photo frame?

    asked on May 18, 2013
  95. Chemistry

    1. A spaceship is found to have a tiny leak that allows the effusion of air into space. Air in the spaceship is a mixture of nitrogen (N2), oxygen (O2), argon (Ar), and trace amounts of other gases. a. Predict which of the three main gases will have the

    asked on August 4, 2019
  96. Biology

    Plant -+ Deer --+ Tiger The first step in the energy chain that created the bonds of proteins in the tiger's muscle cells in the food chain shown above is the A. deer the tiger ate. B. plant the deer ate. C. photons the sun made. D. carbohydrates the plant

    asked on July 13, 2014
  97. college

    A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 14.0 g to 100°C in boiling water and then dropped the hot coin into 29.5 g of water at T = 15.0°C in an insulated

    asked on October 18, 2010
  98. math

    The radius of a moon is 747 miles. use the formula for the radius r of a sphere given it's surface area A, r=√(A/4π) , to find the surface area of the moon. Please help ASAP!!!!! :(

    asked on November 10, 2018
  99. statistics, math, college

    if np >5 and nq>5 estimate P (fewer than 4) with n=13 p=0.4 by using normal distribution as an approximate to the binomial distribution if np

    asked on February 11, 2014
  100. math

    Given the function f(x)=-5+4x^2 calculate the following value: f(a+h) Please help ASAP!!! :(

    asked on June 2, 2019


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