Questions and responses by ANON, page 5
  1. physics

    A sled whose total mass with cargo is 30.0 kg rests on ice. The coefficient of static friction is 0.20, and the coefficient of kinetic friction is 0.15. The sled is attached to a rope, horizontally, in which the tension force is slowly increased. How much

    asked on November 6, 2012
  2. English Literature

    What is ironic about the rioters' wish to kill Death? A.Death is the one who seeks people to kill. B.The rioters should be concerned about each other's greed. C.The rioters believe they can be successful. D. Death and the rioters are thieves. I think the

    asked on October 11, 2012
  3. Torque, Physics

    A ladder of length 2L and mass M is positioned on level ground leaning against a wall such that the angle between the ladder and the horizontal is α. The coefficient of static friction between the ladder and the wall and between the ladder and the ground

    asked on December 5, 2017
  4. Chemistry

    How many electrons in CH3NH3+ ?

    asked on September 1, 2016
  5. math

    A metal worker has a metal alloy that 15% copper and another one is 70% copper. how many kilograms of each alloy should the metalworker combine to make 120kg of a 48% copper alloy?

    asked on March 25, 2016
  6. Pre-Algebra

    If y varies directly with x, find the constant of variation with x = 4 and y = -24 If y varies inversely with x, find the constant of variation with x=5 and y = 10 If y varies directly with x, and y = 35 when x = 5 , find x when y = -7 If y varies directly

    asked on June 7, 2015
  7. Calc

    Let f be the function that contains the point (-1,8) and satisfies the differential equation dy/dx=10/(x^2+1) (a) Write the equation of the tangent to f at x=-1. (b) Use your equation in part a to estimate f(0). (c) We know that the integral from -1 to 0

    asked on February 15, 2014
  8. Spanish (double check my work please)

    Choose the sentence in which the "" word is grammatically correct. A. Esta varilla negra "está" parada sobre otra cosa negra. B. Esta varilla negra "esta" parada sobre otra cosa negra. C. Esta varilla negra "es" parada sobre otra cosa negra.

    asked on March 16, 2011
  9. math

    Find the stationary point on the curve y=x^2-1 and show that it is a minimum point by checking the derivative on both sides of it. I've found that its stationary point is (0, -1), just don't understand what "check the derivatives of both sides of it"

    asked on July 4, 2019
  10. math

    Prove that y=x^3 is monotonic increasing for all x /= 0.

    asked on July 4, 2019
  11. Physics

    Optics/Lens problem. Is the image real or virtual? A converging lens of focal length f1 = +22 .5cm is placed at a distance d = 60 .0cmtotheleft of a diverging lens of focal length f2 = −30.0cm. An object is placed on the common optical axis of the two

    asked on March 21, 2018
  12. Chemistry

    At 25 °C only 0.0610 mol of the generic salt AB2 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 °C? AB2(s) A^2+(aq)+2B^-(aq) Is the answer ksp=9.08*10^-4?

    asked on March 17, 2013
  13. Chemistry, Periodic Table

    Very briefly explain the main horizontal and vertical features of the Periodic Table in terms of the electronic structure and relevant quantum numbers? -------------- Am I being asked to state for instance in the case of Halogens that as we progress down

    asked on May 8, 2018
  14. Math-Algebra II to be exact

    Come up with a new linear function that has a slope that falls in the range −1< m

    asked on March 30, 2018
  15. Force, Gravity, Resultant Force, Vectors

    Can someone just have a quick look over this question and my current answers and tell me if there are any massive mistakes im making. I feel confident with what ive done but just need a little boost. Question: An asteroid of mass m =7 .5×10^12 kg has two

    asked on October 29, 2017
  16. chemistry

    Calculate the standard enthalpy change for the following reaction at 25 °C. H2O+C(graphite)(s) --> H2(g) +CO(g)

    asked on October 28, 2016
  17. us history

    What was the result of the Seneca Falls Convention in 1848?  (6 points) A. Paulina Davis' shocking speech B. The Declaration of Sentiments C. the push for anti-slavery legislation D. the creation of the National Woman Suffrage Association I THINK IT IS

    asked on March 29, 2016
  18. History

    Experts believe that most Native Americans died of diseases like smallpox, typhoid, or diphtheria in the first decades of contact with European settlers. Which statement best explains this phenomenon? Native Americans refused medical treatment from

    asked on October 21, 2015
  19. Math

    Which of the following statements is not always true? A. In a rhombus, the diagonals bisect opposite angles. B. In a rhombus, the diagonals are perpendicular. C. In a rhombus, the diagonals are congruent. D. In a rhombus, all four sides are congruent. I

    asked on January 4, 2014
  20. world history

    The popularity of an individual Hindu deity was largely a reflection of a) its ranking by the Hundred Schools of Thought. b) the approval it received from Siddhartha Gautama. c) its pre-Aryan origin. d) the size of its pyramids. I think it's A but I'm not

    asked on September 14, 2012
  21. chem

    the total pressure of n2o4 and no2 IS 1.38 atm. if kp is 6.75(25 C) calculate partial pressure of NO2 in the mixture. 2NO2 n2o4

    asked on November 28, 2010
  22. Algebra

    What is the slope of the line who goes through the points (4, 2) and (7, -4) ?

    asked on March 19, 2019
  23. maths

    Sketch the region bounded by the x-axis, the curve y = x2 + x + 1 and the lines x = 2 and x = 5. Write down a definite integral that represents the area of that region Just stuck getting points for the first equation as when I put y=0 I got a complex

    asked on May 3, 2018
  24. math

    Weights of women are normally distributed with mean 143 pounds and standard deviation 29 pounds. If 36 women are randomly selected, what is the probability that their mean weight is between 120 and 160 pounds? Round your answer to two decimal places.

    asked on March 31, 2016
  25. Chemistry

    Consider the following data. DeltaHf (Na2O (s))=-414kJ/mol Delta H sublimation(Na)=109 kJ/mol I.E. (Na)=495 kJ/mol Bond Energy (O2) = 495 kJ/mol E.A. (O) = -141 kJ/mol E.A. (O -) = 878 kJ/mol Use this information to calculate the lattice energy of Na2O

    asked on December 6, 2014
  26. Data Management

    if mike does homework today the probability that he will do it tomorrow is 0.8. the probability he will do it today is 0.7. what are the odds that he will do it both today and tomorrow

    asked on January 22, 2014
  27. reading

    How is grandmother's dream different from reality? >Last night I dreamed of an old lover I had not seen him in forty years. When I awoke, I saw him on the street. His hair was white, his back was stooped. How could I say hello? He would have puzzled all

    asked on October 8, 2013
  28. Chemistry

    At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.49. What is the Ksp of the salt at 22 °C?

    asked on March 16, 2013
  29. Chemistry

    calculate the energy in joules lost when 70.0 grams of water cools from 86.4 celsius to 7.1 celsius

    asked on February 26, 2013
  30. Biology

    1. Two species live in the same area but breed in different parts of their habitat. These species are A) geographically isolated. B) ecologically isolated. C) artificially isolated. D) likely to produce hybrids. 2. A large population of animals is split in

    asked on December 12, 2012
  31. math

    determine the linear velocity of a point rotating at 15 revolutions per minute at a distance of 3.04 meters from the center of a rotating object

    asked on February 19, 2012
  32. Spanish

    Choose the sentence which correctly says "He doesn't like to eat." A. Gusta no comer. B. El no gusta comer. C. Comer no gusta. D. No le gusta comer.

    asked on March 18, 2011
  33. Physics

    A bungee jumper of mass 60 kg jumps from a bridge tied to an elastic rope which becomes taut after he falls 10 m. Consider the jumper when he has fallen another 10 m and is travelling at 15 m/s. Work out how much energy is stored in the rope. Take g=10

    asked on December 17, 2010
  34. Computer Science

    Playing a video game on a computer can give different experiences based on the performance capabilities of the computer’s hardware (typically processor and graphics card – among other things). Developers of a new game will typically have

    asked on April 1, 2019
  35. Social Studies

    McCarthyism was able to become strong because of the increasing fear of Communism in China and Eastern Europe that came to the United States. True** False The term "McCarthyism" comes from Senator Jake McCarthy, who spearheaded the drive to defeat

    asked on March 27, 2018
  36. Chemistry

    The enthalpy of combustion of benzoic acid (C6H5CO2H) is –3228 kJ/mol. The burning of 1.698 g of benzoic acid in a calorimeter causes the temperature to increase by 2.865 ºC. What is the heat capacity (in kJ/ºC) of the calorimeter?

    asked on March 25, 2017
  37. Chemistry

    you have 20% sucrose solution. you need to mke 100ml of 15% sucrose solution. which is the correct dilution? A. 85ml of 20% sucrose and 15ml of h2o B. 25ml of 20% sucrose and 75ml of h2o C. 75ml of 20% sucrose and 25ml of h2o D. 15ml of 20% sucrose and

    asked on February 25, 2013
  38. Chemistry

    Selenium from 0.108 g of Brazil nuts was converted into a fluorescent product, which was extracted into 10.0 mL of cyclohexane. Then 2.00 mL of the cyclohexane solution were placed in a cuvet for fluorescence measurements. A.) Standard additions of

    asked on December 12, 2011
  39. Math

    There were 1090 people on a beach. If 10% of the people left. How many remained? thank you.

    asked on October 31, 2018
  40. Simple harmonic motion

    The midpoint of a guitar string executes simple harmonic motion with motion following the form x(t) = A sin(ωt + φ). Amplitude (A)=1.60mm, Angular Velocity (w)=2760 and phase constant (o) = pi/2. How do I find the initial displacement, velocity and

    asked on October 28, 2017
  41. social studies

    When choosing a name for a child, how could a parent best use this study to help ensure the child's normal social development? 1 keep in mind that other characteristics are more important than name 2try not to choose an ethnic name 3Consider an unusual

    asked on September 8, 2013
  42. Math

    b. Alice’s school is selling tickets to the school carnival. On the first day of ticket sales, the school sold 3 adult tickets and 9 student tickets for a total of $75. The second day, the school sold $67 by selling 8 adult and 5 student tickets. What is

    asked on March 12, 2019
  43. science

    which of the following is a risk of biotechnology? organisms can react to an added gene in unexpected ways. crops may become resistant to pests. crimes may be solved with the use of DNA technology. new medical treatments may become available. please help

    asked on March 5, 2019
  44. math

    Determine vector, parametric, and if possible, symmetric equations of the line through D(-4, 3, 6) and parallel to the z-axis. Vector form: + t Parametric: x = -4 y = 3 z = 6 + t Symmetric: x = -4 , y = 3 , z - 6 Is this right?

    asked on January 8, 2019
  45. Algebra

    Given that S=7a+b+7c and also S=6a+8b+6c, where 51

    asked on November 14, 2018
  46. History

    How did the results of the presidential election in 1860 influence South Carolina's decision to secede? there are no choices, it is a short answer. please help :)

    asked on February 7, 2017
  47. Math

    Statistical questions will have. A)Only one correct answer**** B)A variety of answers C)Fewer than three answers D)No answers

    asked on December 15, 2016
  48. Algebra 2

    1. Convert the 5th root of x^3 into a rational expression. 2. Solve i^63 I don't know how to solve these so please help me!!!

    asked on September 19, 2016
  49. History @Reed

    The British and the colonists had many conflicts in the time before the American Revolution. What conclusion can be made about why so much conflict occurred in Boston? The king wanted to control Boston because the wealthiest colonists lived there. The

    asked on October 21, 2015
  50. chemistry

    How many milliliters of a 0.250 M acetic acid solution must be added to 50.0 mL of a 0.750 M NaOH solution to produce a buffer solution with pH = 4.500 ? The pH is given by which we can calculate the concentration of [H+] How do we approach the problem

    asked on April 22, 2015
  51. Geometry

    The circumference of a circle changes from 20 to 4 after a dilation. What was the scale factor of the dilation? A. 1/25 B. 1/5 C. 5 D. 25

    asked on March 2, 2014
  52. math- calculus

    You will often see proj (Vector a onto Vector b) written as projb⃗ a⃗ .Show that projb⃗ a⃗ =(a⃗ ⋅b⃗/ b⃗ ⋅b⃗ )*b⃗ .

    asked on February 26, 2014
  53. Chemistry

    Classify these mixtures as colloids, suspensions, or true solutions. fog, milk of magnesia, mayonnaise, blood, table salt in water, dust-free air I got fog, milk of magnesia, mayonnaise for colloids. Blood for suspensions. Table salt in water and dust-free

    asked on January 29, 2013
  54. algebra

    A soccer ball is kicked toward the goal. The height of the ball is modeled by the function h(t) = −16t2 + 48t where t equals the time in seconds and h(t) represents the height of the ball at time t seconds. What is the axis of symmetry, and what does it

    asked on April 27, 2016
  55. math

    Julia measured the high temperature in her town for one week. Using the chart below, find the mean absolute deviation for the high temperatures. Be sure to show your work for finding: graph:sunday:50 monday:56 tuesday:52 wednesday:46 thursday:48 friday:42

    asked on February 27, 2016
  56. Math

    The line plot below represents the number of letters written to overseas pen pals by the students at Waverly Middle School. Each x represents 10 students. How many students wrote more than 6 and fewer than 20 letters?

    asked on February 27, 2016
  57. Math

    There are 4 black marbles and 5 red marbles in a bag. If you reach in and randomly select 2 marbles, what is the probability that both are red? Explain your reasoning.

    asked on December 3, 2010
  58. chem

    When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 1.0 M HCl is required to react completely with 4.00 g of magnesium i did 4.00g x (mol/24.31 g Mg) x (2 mol HCl/1 mol Mg) x (L/!.0

    asked on March 26, 2009
  59. math

    How could we ensure the inverse of y=x^2 is a function?

    asked on June 30, 2019
  60. Physical science CHECK my answers

    1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom*** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron***** 3. Who provided the first evidence that

    asked on May 26, 2017
  61. Chemistry

    Using the following portion of the activity series for oxidation half-reactions, determine which element(s) can react with an acid to produce H2 gas. Co(s) → Co^2+ (aq) + 2e- Ni(s) → Ni^2+ (aq) + 2e − Sn(s) → Sn^2+(aq) + 2e - H2 (g) → 2H+ (aq) +

    asked on March 5, 2017
  62. Algebra 2 pt 2

    I need help making a table 3. One of the fireworks is launched from the top of a 70ft tall building with an initial upward velocity of 150 ft/sec. a. What is the equation for this situation? g=-32ft/s^2 b. When will the firework land if it does not

    asked on January 22, 2016
  63. Math

    I have 5 problems. Write a mathematical expression to represent each situation. Then find the value of the expression to solve the problem. 1. You play a game where you score -6 points on the first turn and on each of the next 3 turns. What is your score

    asked on August 19, 2015
  64. Social studies

    Suppose the president vetoed a bill passed by Congress. According to the information, which of the following actions by Congress would most likely ensure that the bill will become? 1) let the veto stand 2) reintroduce the same legislation 3) try to

    asked on September 10, 2013
  65. Physics

    A 17 g rifle bullet traveling 220 m/s buries itself in a 3.9 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulum's displacement. Horizantal ____ J

    asked on June 6, 2011
  66. Spanish

    ? Select the number which best completes this sequence: 200, 400, 600 A. ochocientos

    asked on March 19, 2011
  67. math

    The initial price of an engine was $450. To increase sales, the price was decreased by 12%. When it was realized that this new price was not profitable, the price was increased by 10%. Determine the final price of the engine. Answer on the back of the

    asked on January 7, 2019
  68. Algebra

    Given that a+1/(b+(2/c))=17/5, where a is the integer part of the mixed number, and c is the numerator of the fraction part of the mixed number when the mixed number is written in least terms, find the product abc.

    asked on November 14, 2018
  69. Physics

    A swimmer launches himself upwards from a springboard 5.0 m above the surface of the water in a swimming pool. His trajectory is (almost) vertical, and from the top of his trajectory he passes the springboard in just half of the time he takes to reach the

    asked on May 16, 2018
  70. Algebra 1- Help please

    Belinda wants to invest $1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part A:

    asked on December 17, 2016
  71. calculus

    A tank in the shape of a right circular cylinder is filled with water (62.5 lb/ft3). It has a height of 8 ft and a diameter of 10 ft. How much work is required to pump all the water to a spout that is 3 ft above the top of the tank?

    asked on July 18, 2016
  72. math

    Thirteen bowlers were asked what their score was on their last game. The scores are shown below. 190, 150, 154, 194, 182, 190, 170, 151, 190, 170, 178, 161, 180 Find the range of the bowlers’ scores.

    asked on February 27, 2016
  73. Geometry

    Maria is making a stained glass window in the form of a kite. The width of the window must be 15 in., and she only has enough stained glass to cover 60 in. What should the height of the window be? A. 4 in. B. 6 in. C. 8 in. D. 12 in.

    asked on February 9, 2014
  74. English-Grammar

    Identify the word or words the best describes the underlined(in parentheses) word for the question (Comparing the two essays), it is obvious that one relied on more thorough research. A.prepositional phrase B.participial phrase C.gerund phrase D.infinitive

    asked on October 18, 2012
  75. Math

    Is y=(x+1)(x-3) an odd, even, or neither function? f(x)=(x+1)(x-3) = x^2-2x-3 substitute in f(-x) f(-x)=(-x)^2-2(-x)-3 = x^2+2x-3 Therefore it is neither function?

    asked on June 26, 2019
  76. Physics

    A man stands on the edge of a cliff with hands outstretched horizontally carrying identical pebbles, one in each hand. At time t= 0, he drops the first pebble from rest.When this pebble has fallen by 2.0 m, he releases the second pebble. What is the

    asked on May 14, 2018
  77. Physics

    A concave mirror with a radius of curvature of 1.7 m is illuminated by a candle located on the symmetry axis 3.7 m from the mirror. Where is the image of the candle? Answer in units of m

    asked on May 1, 2018
  78. Quantum Physics

    A particle of mass 2.00×10^−10 kg is confined in a hollow cubical three-dimensional box, each edge of which has a length, 2.00×10^−10 m, and for which the potential energy function is zero inside, and infinite outside, the box. The total energy of

    asked on April 22, 2018
  79. Physics

    A workman uses a wrench to apply a 100 N force at a distance 0.15 meters away from the center of a bolt. Calculate the torque created by this force.

    asked on December 10, 2017
  80. Help

    Is the Grammarly plagiarism checker reliable? I put one of my short answers in there a while ago and it said that there was significant plagiarism. Now, about one-two weeks later, I put in the same paragraph and it is saying that there is no plagiarism. I

    asked on December 6, 2017
  81. calculus

    A person is jumping straight up and down on a trampoline. The height of the center of mass of the person is measured every tenth of a second. It takes just over one second to complete one full bounce. (A video of this situation is displayed above.) t

    asked on September 7, 2017
  82. math

    Find the missing value to the nearest hundredth. tan (?) = 15

    asked on June 16, 2017
  83. Chemistry

    A possible set of quantum numbers for the last electron added to complete an atom of potassium in its ground state is a) n=4, l=0, ml=0, ms= -1/2 b) n=3, l=1, ml=0, ms= -1/2 c) n=4, l=1, ml=0, ms= +1/2 d) n=3, l=1, ml=1, ms= +1/2 e) n=4, l=2, ml=1, ms=

    asked on April 29, 2017
  84. Health

    In some cultures, people choose not to eat any type of animal products. How might these people get the protein they need? A)fruits that have a pit-mangos, avocados, apricots, and peaches B)lots of green leafy vegetables**** C)nuts, dried beans, dries peas

    asked on December 14, 2016
  85. chemistry

    A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant

    asked on October 28, 2016
  86. physics

    The British Sovereign coin is an alloy of gold and copper having a total mass of 7.988 g and is 22-karat gold. (a) Find the mass of gold in kg using that # of karats = 24 x (mass of gold)/(total mass). (b) Calculate the volumes of gold and copper used to

    asked on February 4, 2013
  87. trigonometry.

    In a right triangle sinA= 3/5 and C=17. Find a and b. Be sure to draw a right triangle and letter it properly. how can i solve the math in this problem. i know i would have to use the Pythagoream Theorem but i don't know how to set the problem up first.

    asked on January 10, 2011
  88. chemistry

    what is the reaction equation when maleic anhydride is combines with granular zinc and HCl propose structures for the products you would obtain by treating fumaric acid, cinnamic acid, and butynedioic acid with zinc and HCl. write balanced equations for

    asked on October 30, 2010
  89. History

    Which most accurately describes a problem faced by the Russian army on the eastern front during World War I? A. Ottoman forces, Russia’s ally, were ineffective against British forces. B. Russia was simultaneously attacked by Iran and Austria-Hungary. C.

    asked on February 25, 2019
  90. Algebra

    Given that a+b=c, a+c=d and b=c+d, where d is a positive integer, what is the greatest value of a?

    asked on November 14, 2018
  91. Physics help

    A ladder of length 2L and mass M is positioned on level ground leaning against a wall such that the angle between the ladder and the horizontal is α. The coefficient of static friction between the ladder and the wall and between the ladder and the ground

    asked on December 6, 2017
  92. Physics - Angular Speed Question

    A merry-go-round can be modeled as a disk with radius 2.5 meters and mass of 150 kg. For this problem, assume the density is uniform. It is initially rotating at 2.0 rad/sec. Two children of mass 30 kg and 40 kg hop onto the merry-go-round and stay near

    asked on November 11, 2016
  93. Math

    Find how many numbers bigger than 2,999 and less than 8,999 can be formed from the odd digits, if no digits can be repeated.

    asked on April 11, 2016
  94. History @Reed

    Which statement correctly summarizes the colonists' reaction and outcome of the Townshend Act? Some petitioned and boycotted the act; eventually all taxes were repealed except for the tax on tea.**** Most colonists supported the Townshend Act, which led to

    asked on October 21, 2015
  95. history! please help! :)

    1. Andean countries in South America include: *Ecuador and Bolivia *Peru and Chile *Ecuador and Columbia *Venezuela and Brazil I chose all except Peru and Chile. 2. Which of the following statements about the ancestry of most of the people of Central

    asked on May 13, 2015
  96. Physics

    The blades of a ceiling fan have a radius of 0.393 m and are rotating about a fixed axis with an angular velocity of +1.36 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 1.82 rad/s2. After 0.475

    asked on October 18, 2014
  97. Geometry

    A rectangle has an area of 6 square meters. What will be the area of the rectangle if each side length is increased by a factor 5? A. 11 square meters B. 30 square meters C. 125 square meters D. 150 square meters I think the answer is B

    asked on March 2, 2014
  98. science

    Green algae grow in the fur of the South American sloth. The green algae provide camouflage for this tree-doweling mammal, and from the fur and skin of the sloth the algae obtain moisture. A moth also lives in the fur. The moth larvae provide waste

    asked on September 11, 2013
  99. Stats

    A pizza parlor has 13 different toppings available for its pizzas, and 2 of these toppings are pepperoni and anchovies. If a customer picks 2 toppings at random, find the probability that pepperoni is one of the toppings. Round to four decimal places.

    asked on July 17, 2013
  100. Chemistry

    H3BO3 -> H+ + H2BO3- Why doesn't H3BO3 break down to something with H3O+ because it is a weak acid? I know many weak acids break down to something with H3O+ like HCN, C6H5COOH, HNO2, and HF.

    asked on March 12, 2013


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