Questions Asked on
June 28, 2011

  1. Chemistry

    Consider the combustion of liquid methanol, CH3OH (l) CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = -726.5 kJ What is for the reaction represented by this equation? Express your answer using four significant figures

    asked by Lisa
  2. physics

    a skater holds her arms outstretched as she spins at 140 rpm. What is the speed of her hands if they are 125 cm apart?

    asked by Kate
  3. Physics

    A frog in a hemispherical bowl, as shown below, just floats in a fluid with a density of 1.26*10e3 kg/m3. If the bowl has a radius of 6.16 cm and negligible mass, what is the mass of the frog?

    asked by Drew
  4. Chemistry

    Energy, q, w, Enthalpy, and StoichiometrySource(s): Consider the combustion of liquid methanol, CH3OH (l). CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = -726.5 kJ Part A: What is the enthalpy change for the reverse reaction? Express your answer using four

    asked by Lisa
  5. physics

    A satellite explodes in outer space, far from any other body, sending thousands of pieces in all directions. How does the linear momentum of the satellite before the explosion compare with the total linear momentum of all the pieces after the explosion?

    asked by Angel
  6. Chemistry

    Consider the combustion of liquid methanol, CH3OH (l) CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = -726.5 kJ What is for the reaction represented by this equation? Express your answer using four significant figures

    asked by Lisa
  7. phtsical science

    Which has greater momentum, a 2.0kg hockey puck moving east at 2.5m/s or a 1.3kg hockey puck moving south at 3.0m/s?

    asked by Micah
  8. physical science

    A object that has a mass of .25kg is moving with a momentum of 5 kg„ªm/s. What is its velocity?

    asked by Micah
  9. physics pls help

    A sound source producing 1.00-{\rm kHz} waves moves toward a stationary listener atone-half the speed of sound. The frequency that the listener will hear is2000 Hz. when the source is stationary and the listener moves towardthe source at one-half the speed

    asked by dan pogi
  10. statistics

    Assuming that the weights of newborn babies are normally distributed with mean 6.5 pounds and standard deviation 1.2 pounds, how many babies in a group of 80 do we expect to weigh more than 8.9 pounds? Please show work Thank you

    asked by Harley
  11. physical science

    A marble is rolling at a velocity of 1.5 m/s with a momentum of 0.10 kg m/s. What is its mass?

    asked by Micah
  12. Geography

    How do the monsoons and the mountains influence the climate in South Asia? Include in your answer an analysis of how monsoons can be responsible for survival and hardship in this region. Monsoons greatly influence the climate in South Asia. In the winter,

    asked by Chandler
  13. physical science

    how much heat must be added to 1.0 kg of water at 100 degrees Celsius to convert it to steam at 100 degrees Celsius? i know that normally when the temperatures are the same, the heat added is zero, but i think that in this case i need to do something

    asked by miley
  14. Physics

    Hey, it's me again, Can someone help me with this question? A water balloon is dropped from the top of a building. Assume the balloon does not break when it strikes the ground. If the water balloon falls a distance of 21m, what is the maximum temperature

    asked by Josh
  15. Math

    There are 5 red marbles, 8 blue marbles, and 12 green marbles in a bag. What is the theoretical probability of randomly drawing a red marble?

    asked by KRH
  16. Physics

    In an intense battle, gunfire is so intense that bullets from opposite sides collide in midair. Suppose that one (with mass M= 5.12 g moving to the right at a speed V= 214 m/s directed 21.3 degrees above the horizontal) collides and fuses with another with

    asked by Casey
  17. algebra

    Leah has x half-dollars and y nickels, while James has x quarters and y dimes. Both have a total of 3$ . Compute the ordered pair(x,y).

    asked by
  18. Algebra 1

    Candy worth $2.45 per pound is mixed with candy worth $2.30 per pound.How much of each kind of candy must be used to have 30 pounds of a mixture worth $2.35 per pound?

    asked by Bella
  19. physics

    Two identical cars have the same speed, one traveling east and one traveling west. Do the cars have the same momentum?

    asked by Angel
  20. physics

    An object is thrown upward at v0 from the surface of a small spherical planetoid of mass M and radius R When the object is a distance R above the surface, how fast is it moving in simple terms of v0, R and M?

    asked by colton
  21. Physics

    A 5 kg ball is initially at rest at the top of a hill 10m high. If it rolls down the hill (converting all of its potential energy to kinetic energy,) what is the maximum kinetic energy it could have at the bottom of the hill? -I am not sure what formula to

    asked by Jordan
  22. math

    in a distribution of 160 values with a mean of 72,at least 120 fall within the interval 67-77. approximately what percentage of values should fall in the interval 62-82? use chebyshev's formula.

    asked by ellen
  23. Geography

    Do you think that the British influence in India was positive or negative? Explain your answer. I think that the British influence in India was both positive and negative. They helped ge the country on track by doing things such as ending slavery,

    asked by Chandler
  24. Chem

    How would I make a 0.25M solution of sodium bisulfite?

    asked by Talia
  25. English

    Thank you very much for your help.I need you to check these sentences, please. 1) He plays more sports than Keith. Will you have to take a make-up exam at the end of Agust? 2) As our flight is due to land in London in the late evening, I wonder how far

    asked by Henry2
  26. science207

    How much would be appropriate for wealthy countries to contribute to global health? Why should we do more than we do now? What’s in it for us?

    asked by tamika

    Which machines has more mechanical advantage pulley or incline plane? I asked this question before but did not quite understand the answers that were given to me. I think that the incline plane has more mechanical advantage in a friction less environment.

    asked by Jordan
  28. chem

    For a mixture of two gases, consisting of 1.00 mol of N2 and 1.00 mol of CF4, at a total pressure is 2.04 atm, what is the partial pressure of N2?

    asked by marl
  29. physical science

    When you are driving a golf ball, a good follow-through helps to increase the distance of the drive. A good follow-through means that the club head is kept in contact with the ball as long as possible. Why does this technique allow you to hit the ball

    asked by Micah
  30. science207

    Why do you think controlling greenhouse gases is such a difficult problem? List some of the technological, economic, political, emotional, and other factors involved. Whose responsibility is it to reduce our impacts on climate?

    asked by tamika
  31. physical science

    A steel ball whose mass is 2.0 kg is rolling at a rate of 2.8 m/s. What is its momentum?

    asked by Micah
  32. Pre-Calculus

    Which one of the following situations would have a graph that is a constant function? (5 points) (Points : 5) The amount of money that someone earning $10.75 per hour would make The total number of days in September each year The amount of rainfall in New

    asked by kalakalikalakali
  33. Derivatives

    a pationt recives an injection of 1.5 milligrams of a medication, and the amount remaining in the bloodstream t hours later is A(t)= 1.5e^-0.08t .find the instantaneous rate of change of this amount: a) Immediately after the injection (time t=0)

    asked by Courtney
  34. accounting

    Recording federal income tax transaction and cash dividend transactions. What annual per share dividend was paid to common stockholders in 2010? May 15-

    asked by DOROTHY
  35. government

    1. The _____ Act mandated that at least some federal employees be chosen on the basis of merit instead of political connections. Federal Employment Pendleton Bureaucratic Fairness Civil Service 2. The cooperation between interest groups, federal agencies,

    asked by taylor
  36. physical science

    When you are driving a golf ball, a good follow-through helps to increase the distance of the drive. A good follow-through means that the club head is kept in contact with the ball as long as possible. Why does this technique allow you to hit the ball

    asked by Micah
  37. godby

    Fernando is going to draw a marble from the bag, replace it, and then draw another marble. What is the probability that Fernando will get a green or blue marble on the first draw and a pink on the second draw?

    asked by Anonymous
  38. statistics

    Classify the variable as nominal, ordinal, discrete, or continuous, and explain: Customer’s driver’s license number

    asked by chris
  39. geometry

    determine the length of the sides and the measures of the angels for the congruent quadrilaterals ABCD and A'B'C'D' there are 2 diagrams but don't know how to show it to you

    asked by Carol
  40. Algebra 1

    Solve. y=2x - 7 3x - 4y=8

    asked by Bella
  41. chem

    Calculate the volume of hydrogen produced by the electrolysis of 54.0 mL of water at 27.°C and 1.3 atm, using the ideal gas approximation.

    asked by marl
  42. english

    Example of literary and non literary prose by citing example?

    asked by sonu
  43. matha

    my one digit is tens i 3 plus my ones hundredsdigit is 7 less than my thousands thousands digit is 8.what number am i?

    asked by Anonymous


    asked by AGNES
  45. AP World History Please Help Me Mrs.Sue

    Hi I need help with this What classical institutions survived the collapse of the classical civilizations and why? I just need help with knowing Romes institutions please help.

    asked by Nina
  46. economics

    1. why is the subject of managerial economics relevant to problem of global warming? 2.explain with examples why it is important for managers to have good theories

    asked by kevin eli
  47. physics

    if a 5microfarad capacitor is charged by a 20volts battery and it is then connected across an uncharged 20microfarad capacitor , find the potential energy

    asked by Edward
  48. Physics

    A winch with a power rating of 400 W lifts a 200kg object off the ground at a constant velocity for 17 seconds. How high was the object lifted? What is the object total energy? Please indicate which equation you use, what variable corresponds to each

    asked by Tina
  49. physics

    a car is traveling with a speed of 15 m/s on a stratight horzontal highway. the wheels of the car have a radius of 50cm.if the car then speeds up with an acceleration of 2 m/s for 5s, find the number of revolution of the wheels during this period.

    asked by abdo
  50. music

    for my music homework i have to do a poster on mozarts minuets and i don't know anything about him .please help!!!!!!!!!!!!!

    asked by gemma
  51. english

    Alright, I am also reading Anne Frank, but I'm having trouble with the question about how Anne used humor to relieve the anxiety and boredom of living in the hiding?

    asked by Collin
  52. Chemistry

    3) You make a solution by dissolving 3.4g Ba(OH)2 in enough water to make 450ml of salt solution. a. What is the molarity of the solution?

    asked by Sasha
  53. trig

    A 115 foot foot casts a 147 foot shadow, what is the degree of elevation to the sun

    asked by mike
  54. business law

    Copenhaver put pay washers and dryers in an apartment complex owned by Berryman. With four years to run on the contract, Berryman kicked Copenhaver out. Within 6 months, Copenhaver had put all equipment back into service in other locations. Copenhaver sued

    asked by Ana
  55. calculus

    How to make a sign diagram

    asked by a
  56. statistics

    Weights of a certain model of fully loades gravel trucks follow a normal distrbution with mean = 6.4 tons and standard deviation = 0.3 ton. Waht is the probability that a fully loaded truck of this model is a. less than 6 tons? b. more that 7 tons? c.

    asked by Harley
  57. business law

    A builder constructed a house according to plans provided by the owner. The contract specified that only Reading brand pipe was to be used in the plumbing. After the house was built, the owner discovered that another brand of pipe had been used. The owner

    asked by Ana


    asked by renee
  59. Trigonometric Substitution

    Trigonometric Substitution a. Explain why the substitution x = asin(Theta) guarantees that cos(Theta) is greater than or equal to 0 . b. What sort of restriction must we put on x and a so that the substitution x = asec(Theta)will guarantee that tan(Theta)

    asked by John
  60. chemistry

    how much heat would it take to raise the temperature of 52.0 grams of water from 22.0 degrees celcius to 100.0 degrees celcius

    asked by Shelly
  61. calculus

    I need to find the dy/dx of x^2ln(x^2)I tried to do it the way I thought, but it did not come out right.

    asked by Ronald
  62. philosophy

    In "Some Moral Minima," Lenn Goodman argues that there are certain things that are simply wrong. Do you think Goodman is right? Using specific examples, explore the challenges Goodman presents to relativism. Determine whether you think there are such

    asked by kim
  63. Algebra 1

    Solve. 3x - y=4 2x - 3y= - 9

    asked by Bella
  64. History-Civil War

    1865: Marching through Georgia In terms of supply, how was Sherman"s march different than other Civil War campaigns? What I found was..Sherman telegraphed President Lincoln, asking him as a gift to Savannah, he would need 150 guns along with plenty of

    asked by Joanne


    asked by renee
  66. Physics

    1. if a 0.05kg coin is hanging from 22m above the ground: a. If you drop it, how fast will the coin be moving halfway to the ground? b. How fast will it be moving just before it hits the ground? If you could point me the right direction with equations that

    asked by Tina
  67. biology

    Describe how the human defense line work.

    asked by akim
  68. calculus

    After x weeks of prcatice, a student can type f(x)=80(1-e^-0.3x)words a minute. How sooon will the student be able to type 60 words per minute? (Round to the nearest tenth)

    asked by Anonymous
  69. physics

    what is the speed of a car in km/n if it travels 108 km. in 1 min.?

    asked by junna rose
  70. calculus

    how do you find the absolute maximum of 2x^3+3x^2-12x-7 on interval (-3,0)

    asked by a
  71. Psychology

    Dr. Kyle shared the newspaper clipping with his class. "This is an unusual case, but I believe the punishment phase of the trial would have been different in another state. The crime was committed, but the defendant is not in touch with reality most of the

    asked by Shawn
  72. English

    Okay, another question on the Diary Of A Young Girl by Anne Frank. In the book, Anne says this statement: "There is nothing we can do but wait as calmly as we can till the misery comes to an end." How does this statement help to place readers in the

    asked by Court


    asked by renee
  74. English

    One last question for today that I need checked. What can you assume about the effective-ness of the efforts of Dutch resistance work-ers to sabotate the Nazis? I just put it was very effective, but I feel that it's asking for more in the question, and

    asked by Court
  75. physics

    In Physics, it is important to use mathemat- ical approximations. For instance, in a small angle approximation, tan α ∼ sin α . Find the largest angle α for which the dif- ference of sin α − tan α is less than 3.52% of the sin α value.

    asked by ryan
  76. dy/dx

    Ln (2x^2-3x)^4 how to solve it. I did the steps but none of my answers are the choices

    asked by Anonymous
  77. MAT117

    During the first part of a trip, a canoeist travels 68 miles at a certain speed. The canoeist travels 16 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hrs. What was the speed on each part of the trip?

    asked by Leina'ala
  78. alg 2

    A rectangular plot is 30 feet long and 20 feet wide. The area will be doubled by adding a strip at one end and another strip of the same width on one side. What would be the width of the strip?

    asked by Shannon
  79. mathmm

    How to make a sign diagram

    asked by Alex

    Does mass affect mechanical advantage in any way?

    asked by Jordan
  81. algebra

    Write in Simply form: Can you help? 6x^2+13x+6/3x^2+x-2=

    asked by Shun


    asked by DOROTHY
  83. statistics

    1. A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and

    asked by neil
  84. English

    I need help finding a word that means "to make greek" using "hellen" as the base

    asked by Kay
  85. Algebra 1

    Find the coordinates of the vertex of the graph y= -x^2+2

    asked by Mia
  86. Public health

    Why is epidemiology important in the study of health and disease in communities?

    asked by Kathy
  87. Algebra 1

    Solve. (3^2x)+5=(9^2x-5)

    asked by Mia
  88. physics

    In an experiment similar to that done by Michelson,the frequency of rotation of the eight-sided mirror is 530 Hz. Calculate the speed of light in air if the distance from the rotating mirror to the stationary mirror is 35.0 km.

    asked by michelle
  89. physical science

    There are two set pieces in a theater sitting on platforms with wheels. One is a tree with a mass of 50 kg. It is moving at 3 m/s. The other is a fence with a mass of 30 kg. If the two set pieces have equal momentum, how fast is the fence moving

    asked by norma
  90. technology

    Should there be any limitations on linking. If not, why not? If so, which limitations should be in place and why?

    asked by liz
  91. Chemistry

    3) You make a solution by dissolving 3.4g Ba(OH)2 in enough water to make 450ml of salt solution. a. What is the molarity of the solution?

    asked by Sasha
  92. Calculus 2

    Use the Midpoint Rule to approximate the integral (–10x+(7(x^2))) from 10 to 17 with n=3

    asked by Larry
  93. biology

    How do c3, c4, and CAM plants survive under dry conditions?

    asked by akim
  94. English

    Did I properly quote this sentence? Feldman is the author from my school textbook. I am not sure if I have this part right. Do I include the authors' name within the brackets() are do I leave out the author name and just put brackets around the year and

    asked by Sharon
  95. Pre-Calculus

    1. Find functions f and g so that f[g(x)]=H(x) where H(x)=(1+x^2)^3 2. For f(x)=4x+1 and g(x)=x^2-2x-4, find (g-f)(x) 3. Determine f(x)=x/x^2-4 4. Determine the domain of f in f(x)=10-sqrt3-x

    asked by kalakalikalakali
  96. Calc I

    I really need assistance!! I am to write an equation so that I can graph it. I do not understand how to graph OR write the equation for: x^2-y^2=16 for a tangent and normal line??? I keep coming up with the wrong answers...and the problem is I was not

    asked by Kejo
  97. math

    the proportion of the wind's energy that can be obtained from a windmill is given e(x)=4x^3-8x^2+4x where x is slowed find proportion x that max interval (0,1)

    asked by a


    asked by renee


    asked by renee


    asked by renee


    asked by renee
  102. college algebra

    graphing a hyperbola. -4x^2+9y^2+8x+72y-4=0 - just need help setting it up into an equation

    asked by Carlee
  103. Calc I

    I need to find the equations of the tangent and normal line for x^2-y^2=16, at the point (-5,3). I have to show every detail for my work...then use graphing software to enter my equations, so can anyone help me showing all the details of the work so that I

    asked by Kejo, Help!!!!
  104. English

    How would you interpret the messages in the poem Anne received from her father for her birthday? I read them, but don't understand at all.. of course it makes sense I don't understand.. I am a 10 year old doing a 13 year old's work because I skipped a few

    asked by Carlie
  105. health care

    by creating a committe on social welfare, the American Association of Labor Legislation helped to?

    asked by sara
  106. calculus

    The point of inflection for graph x^3/3-x^2-3x+7 I cannot seem to find it as stated.

    asked by tish
  107. calculus

    2x^3+3x^2-12x-7 the absolute maximum. I need help because it seems no one else in my class knows how to.

    asked by josh
  108. Science (Solar System)

    How are the Oort Cloud and Kuiper Belt different from each other?

    asked by DaniHat


    asked by renee
  110. math

    Will the three segments given below form a triangle? Explain why or why not. AB=1 INCH BC=2 INCHES AC=3 INCHES

    asked by Anonymous
  111. Math

    The amount of background noise is important to television news reporters. One station developed the formula N = -r^2 + 12t + 54 showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). How many

    asked by candy
  112. mathm

    how do you find the absolute maximum of 2x^3+3x^2-12x-7 on interval (-3,0)

    asked by Greg
  113. calculus

    I see that someone else on here had the same problem, I wanted to find the solutions for 5xe^x+1 but its not really an equation.

    asked by Ashley
  114. chemistry

    You have an aspirin dissolving in water, with this elements ( arthritis strength BC, arthropan and Ascripitin A/D), how can you separate them to find the amout of each on in water?

    asked by Mariana
  115. History

    What was the nature and extent of the Umayyad Empire?

    asked by Anonymous
  116. PHYSICS

    When you have more pulleys does the mechanical advantage and efficiency increase or decrease?

    asked by Jordan
  117. math

    -1/7 divided by -4

    asked by megan
  118. Algebra 1

    The sum of the digit of a two digit number is 13. If the digits are reversed, Then the new number is 9 more then the original number. Find the original number.

    asked by Bella
  119. Algebra 1

    The sum of the two digit number is 7. The ten digit is one less than 3 times the one digit. Find the number.

    asked by Bella
  120. algebra


    asked by Anonymous
  121. IT

    Can anyone tell me which WIMAX system you would use for last mile broadband ? with a link to a town the miles away ??? Mobile or fixed ??? Thnks

    asked by Allan
  122. Chemistry

    A 2.64 L container is filled with 169 g of argon. (a) If the pressure is 10.0 atm, what is the temperature? ____K (b) If the temperature is 225 K, what is the pressure? What Gas law formula would I use?

    asked by Sophie
  123. math

    5x4 3/4

    asked by alexio
  124. Chemistry

    A 2.64 L container is filled with 169 g of argon. (a) If the pressure is 10.0 atm, what is the temperature? ____K (b) If the temperature is 225 K, what is the pressure? What Gas law formula would I use?

    asked by Sophie
  125. English

    I left out a few sentences.Thank you for your cooperation. 1) Do/take an exam 2) Have a holiday/go on holiday/go to London for my holiday. 3) go for a bath (in the sea, at the swimming pool),take a bath (at home), take/have a shower. 4) Don't ride your

    asked by Henry2
  126. physcis

    use the principle of an incline plane and derive the coeffecient of stationary friction

    asked by merry light


    asked by renee
  128. algebra

    2/3 _ x/5 < 4/15

    asked by Poochie
  129. Calculus


    asked by renee
  130. algebra

    I=Prt,for t

    asked by Poochie
  131. Community Health

    Are the levels of prevention appliacble and practiced in your community?

    asked by Kathy
  132. math

    8-2 |r| = -12 ???

    asked by lauren
  133. Algebra 1

    Give the value of a,b,c in equation 3x=5 - 0.5x^2

    asked by Mia
  134. math

    what is five times ten

    asked by desmond
  135. math

    |x| - 5 __________ = 6 4 i need help

    asked by Anonymous
  136. poetry

    I need help scanning "Combing"

    asked by Don
  137. Physics Equation

    What is the equation for total energy (TE)?

    asked by Tina
  138. English

    Can you please check these expressions? It's really urgent. The first set of expressions concerns husehold chores whereas the others refer to what you have to do when you do the washing. 1) I have to clean the bathtub, the sink and the toilet, dry the

    asked by Henry2

    What is the concentration in normality of NAOH (19.5CM3)

    asked by S.KALEKYE
  140. Math

    Find the probability of the following if there are 30 students in the class who have been numbered and you use a calculator to generate random numbers between 1 and 30. A number less than 10.

    asked by Mike
  141. Psychology

    • Write a 200- to 300-word response to the following: Identify and explain the scientific process (unsystematic observation, building theories, and evaluating propositions) as applied to personality psychology.

    asked by Stacy
  142. math

    my daughter in Grade 2'her project is "MAKE A LADDER OF 8 STEPS WITH NUMBERS TO FIND ASUM TOTAL.I Can't undestood it.

    asked by shalini
  143. math


    asked by megan
  144. physics

    A 1,200-kg car runs into the rear of an 1,800-kg minivan that was moving at 6 m/s. The two vehicles are locked together after the collision and move with a speed of 12 m/s. How high above the ground would the locked- together vehicles have to be raised in

    asked by m
  145. science- physcs

    Two trains are passing against each other.? Two trains are passing against each other. train A is going north with velocity of 47 km/hour. train B is going south with velocity of 94 km/hour. a passenger in train A see the smoke that emitted from his train

    asked by Anonymous
  146. Physics

    A 30kg block sits on a ramp, with Θ=47. The ramp is 13m off the ground at the tallest point. If the block slides in the presence of friction, with μ=0.1, how fast is the block moving when it hits the bottom of the ramp? Please indicate which equation you

    asked by Tina
  147. u.s history

    what was one of the most difficult tasks that homesteaders faced?

    asked by quaonna
  148. world geography

    why did the south agrican government change its policy of apartheid in 1990 and 1991

    asked by courtney
  149. calculus

    how do you know when a graph concave upwards just not getting it.

    asked by a
  150. calculus

    find critical values for the function sqrt x^2+x-20

    asked by a
  151. science

    is sulphur a good conductor of electricity

    asked by mainak