Most popular questions and responses by will
  1. physics

    A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in the drawing bisects the 30.0° angle. The magnitude of the force applied by each rope is 2900 newtons (N). (a) How much force

    asked on June 28, 2013
  2. chemistry

    sodium reacts completely with 0.142kg of chlorine, forming 234g of sodium chloride. What mass of sodium reacted? I know that for chemical changes the amounts should end up being equal, but I don't know how to set up the problem.

    asked on September 17, 2010
  3. chemistry

    determine the end value of n in a hydrogen atom transition if the electron starts in n=2 and the atom absorbs a photon of light with a frequency of 4.57 times 10^14 Hz

    asked on July 5, 2010
  4. chemistry

    When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 24.0 of carbon were burned in the presence of 76.8 of oxygen, 12.8 of oxygen remained unreacted. What mass of carbon dioxide was produced?

    asked on September 17, 2010
  5. college math - biostatistics

    hey... first time user and really lost. wondering if someone can help: Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14% of senior citizens (65 years old or older) get the flu each year. However, about 24% of

    asked on February 18, 2009
  6. precalculus

    There are two boxes. The red box contains four red marbles and one blue marble, and the blue box contains five blue marbles and three red marbles. The following experiment is done a hundred times: A marble is randomly drawn from one of the boxes, its color

    asked on March 30, 2019
  7. accounting

    Jack Shellenkamp owns and manages a computer repair service, which had the following trial balance on December 31, 2011 (the end of its fiscal year). BYTE REPAIR SERVICE Trial Balance December 31, 2010 Cash $8,000 Accounts Receivable 15,000 Parts Inventory

    asked on February 25, 2012
  8. Science

    Which statement is true about the products of cellular respiration? They contain oxygen. They contain glucose. They become the products of photosynthesis. They become the reactants of photosynthesis.***

    asked on February 7, 2019
  9. Physics

    Two ice skaters have masses m1 and m2 and are initially stationary. Their skates are identical. They push against one another, as shown below, and move in opposite directions with different speeds. While they are pushing against each other, any kinetic

    asked on April 1, 2008
  10. Algebra 1

    You trimmed a large square picture so that you could fit it into a frame. The area of the cut picture is 20 square inches. What is the area of the original picture?

    asked on February 17, 2016
  11. Chemistry Periodic Trends

    The electron affinities of the elements from aluminum to chlorine are -44, -120, -74, -200.4, and -384.7 kJ/mol respectively. Rationalize the trend in these values. Electron affinity is the energy absorbed (endothermic) or emitted (exothermic) by the

    asked on February 11, 2007
  12. Economics

    The price received by sellers in a market will decrease if the government Answer A. imposes a binding price floor in that market. B. decreases a binding price ceiling in that market. C. decreases a tax on the good sold in that market. D. increases a

    asked on November 29, 2011
  13. Economics

    Sandra purchases 5 pounds of coffee and 10 gallons of milk per month when the price of coffee is $10 per pound. She purchases 6 pounds of coffee and 12 gallons of milk per month when the price of coffee is $8 per pound. Sandra’s cross-price

    asked on November 29, 2011
  14. Physics

    Suppose you are hiking down the Grand Canyon. At the top, the temperature early in the morning is a cool 1°C. By late afternoon, the temperature at the bottom of the canyon has warmed to a sweltering 37°C. (a) What is the difference between the higher

    asked on April 3, 2008
  15. Math

    Suppose you have a cache of radium, which has a half-life of approximately 1590 years. How long would you have to wait for 1/5 of it to disappear?

    asked on March 26, 2015
  16. accounting URGENT HELP DUE IN 1HR

    (a) Fill in the missing amounts. (If answer is zero, please enter 0. Do not leave any fields blank.) Account Titles Trial Balance Adjusted Trial Balance Dr. Cr. Dr. Cr. Accounts Receivable 34,000 Prepaid Insurance 26,000 20,000 Supplies 7,000 Accumulated

    asked on March 11, 2012
  17. Physics

    A car with a mass of 950 kg and an initial speed of v1 = 21.5 m/s approaches an intersection, as shown in the figure. A 1300 kg minivan traveling northward is heading for the same intersection. The car and minivan collide and stick together. If the

    asked on October 19, 2008
  18. Calculus

    What is the Riemann sum to find the area under the graph of the function f(x) = x4 from x = 5 to x = 7.

    asked on May 21, 2018
  19. physics

    In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 2.00 m and cross the bar with a

    asked on October 12, 2009
  20. Calculus help please

    Use the mid-point rule with n = 4 to approximate the area of the region bounded by y = -x^3 and y = -x

    asked on July 16, 2018
  21. chemistry

    I am having a hard time with this one not sure how to set up the problem. A gas can holds 1.7gal of gasoline. What is this quantity in cubic centimeters? I know that 1gal=3.785L I know that 1L=1000cm^3 I have tried 1.7gal*3.785L/1gal=6.4345cm^3. I just can

    asked on September 8, 2010
  22. chemistry

    Determine the hydroxide ion concentration in a solution that is 0.0004 M HCl. Answer in units of M. I have no idea how to start, I just need to know what I need to solve for and hoe to set it up, I know the formula pOH^-=-log[OH^-] I just don't know where

    asked on April 16, 2015
  23. math

    Jamie is riding a Ferris wheel that takes 15 seconds for each complete revolution. The diameter of the wheel is 10 meters and its center is 6 meters off the ground. When Jamie is 9 meters above the ground and rising, at what rate is Jamie gaining altitude?

    asked on March 10, 2019
  24. math

    Courtney is supposed to run laps around the outdoor track. At the start of each lap, however (even the first), there is always an 8 percent chance that Courtney will call it quits for the day. What is the probability that today Courtney will run (a) no

    asked on March 11, 2019
  25. economics

    which of the following statements about inflation are true? check all that applies a) policy makers also worry about a negative inflation rate, or deflation b) painful government actions may sometimes be necessary to bring down a high inflation rate. c) A

    asked on September 23, 2012
  26. history

    Describe the social structure and lifestyles of the 1960s Counterculture. How did the Vietnam War influence the Counterculture? Is there a counterculture today?

    asked on June 23, 2008
  27. Economics

    Suppose the government has imposed a price floor on the market for soybeans. Which of the following events could transform the price floor from one that is not binding into one that is binding? A. Farmers use improved, draught-resistant seeds, which lowers

    asked on November 29, 2011
  28. geometry help ASAP

    Persevere in solving problems. Create a report that provides a detailed description of the park. Include the following in your report: the actual side lengths of the triangular plot of land the type of triangle formed by the intersection of the three

    asked on December 10, 2018
  29. Calculus

    A rectangle is to be inscribed under the curve y=4cos(.5x). The rectangle is to be inscribed from x=0 to x=pi. Find the dimensions that give max area and what is the max area.

    asked on February 1, 2018
  30. pre cal

    The vector u = (4300, 5200) gives the number of units of two models of laptops produced by a company. The vector v = 1800, 1200 gives the prices (in dollars) of the two models of laptops, respectively. Identify the vector operation used to increase revenue

    asked on July 14, 2016
  31. Physics

    When the three blocks in the figure below are released from rest, they accelerate with a magnitude of 0.370 m/s2. Block 1 has mass M, block 2 has 5M, and block 3 has 5M. What is the coefficient of kinetic friction between block 2 and the table? block 1 is

    asked on November 18, 2010
  32. physics

    Waves on a particular string travel with a speed of 17 m/s. By what factor should the tension in this string be changed to produce waves with a speed of 102 m/s

    asked on February 7, 2012
  33. Chemistry

    A compound of chlorine and fluorine, ClFn, reacts at about 75oC with uranium metal to produce uranium hexafluoride, UF6 and chlorine monofluoride, ClF (g). A quantity of uranium produced 3.53g UF6 and 343 mL ClF at 75oC and 2.50 atm. What is the formula

    asked on May 26, 2014
  34. physics

    The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.570·mg is then applied at upward angle è = 22°. (a) What is the magnitude of the acceleration of the block across the floor if (a) ìs = 0.600 and ìk

    asked on November 18, 2010
  35. physics

    When a 0.045 kg golf ball takes off after being hit, its speed is 35 m/s. A)How much work is done on the ball by the club? B)Assume that the force of the golf club acts parallel to the motion of the ball and that the club is in contact with the ball for a

    asked on April 18, 2010
  36. math

    In the triangles, we have XY = 2AX = 2YB and AZ/ZC = 2/3. Find the ratio of the area of triangle YBC to the area of triangle ZYC.

    asked on March 29, 2015
  37. Physics

    What force is required to stop a 1500-kg car in a distance of 0.20 m if it is initially moving at 2.2 m/s?

    asked on December 7, 2017
  38. precalculus

    The height of an object moving up and down is described by 𝑦 = 72 + 40𝑐𝑜𝑠18𝑡 (in degree mode). This is an example of simple harmonic motion. To at least three decimal places, confirm that the average speed of the object is 2/π times its

    asked on March 12, 2019
  39. Physics

    An 85 kg jogger is heading due east at a speed of 1.7 m/s. A 55 kg jogger is heading 40° north of east at a speed of 3.4 m/s. Find the magnitude and direction of the sum of momenta of the two joggers.

    asked on April 1, 2008
  40. Consumer Math

    Compute the square footage of carpet needed to cover a room 12' 3" x 18' 4".

    asked on January 11, 2013
  41. Please help

    A rectangular picture frame has a perimeter of 58 inches. The height of the frame is 18 inches. What is the width of the frame? Please help show work and help answer thanks

    asked on September 25, 2015
  42. Math

    What is the pattern for 3, 19, 99, 499, 2499

    asked on September 13, 2010
  43. english

    can someone please explain to me this excerpt from Mary Reynolds, an ex slave. " He raised corn and cotton and cane and 'taters and goobers, 'sides the peas and other feedin' for n******. I 'member I helt a hoe handle mighty onsteady when they put a old

    asked on May 28, 2019

    Please post a substantive response to the following discussion questions by clicking on Reply: Aristotle developed a theory of persuasion by which there are three ways a speaker can persuade an audience. Ethos is the idea that an audience can be persuaded

    asked on June 28, 2012
  45. Chemistry

    If a solution contains 0.65mol of OH−, how many moles of H+ would be required to reach the equivalence point in a titration?

    asked on November 16, 2014
  46. Physics

    A mine car (mass 380 kg) rolls at a speed of 0.5 m/s on a horizontal track, as the drawing shows. A 150 kg chunk of coal has a speed of 0.80 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the

    asked on April 1, 2008
  47. Math

    The crate has 22 red apples 15 green apples and 8 yellow apples what is the ratio that compares the number or green apples to the total number of apples.

    asked on September 28, 2019
  48. ACT Prep

    Question:So,far Michael has earned the following scores on five 100-point tests this semester: 72, 94, 85, 83, 97. What score must he earn on the sixth 100-point test of the semester if he wants to make an 88 point average for the six tests? Answer Choices

    asked on February 3, 2016
  49. math

    During a severe thunderstorm, Tim saw a flash of lightning and then six seconds later heard a clap of thunder. The speed of sound is 1088 ft/sec. How far is Tim from the lightning? Nearest Thousand Feet.

    asked on February 27, 2015
  50. chemistry Pleae

    C7H14O2 + NaOH What will this combination make? and can it be balanced?

    asked on August 22, 2013
  51. science

    Here are some examples of molecules: Cl2, CO2, SO2, and CF4. Each of these is related in that they're all bonded covalently. Which of these is a covalently-bonded molecule also? A. He atoms B. K2S C. BaBr2 D. P2O4

    asked on June 29, 2016
  52. Statistics

    A researcher surveyed college students to study their opinion about the proposed change in smoking rules. The researcher asked a group of 30 students: 12 of them supported the change, 13 of them did not, and 5 had no opinion. This is not a binomial model

    asked on July 29, 2013
  53. Math

    Tickets to a game are $5 for adults and $2 for children. Six hundred tickets are sold for a total of $2160. How many adult tickets and how many children's tickets have been sold?

    asked on July 27, 2011
  54. Chemistry

    Small amounts of chlorine gas can be gener- ated in the laboratory from the reaction of manganese(IV) oxide with hydrochloric acid: 4 HCl(aq) + MnO2(s) → 2 H2O(l) + MnCl2(s) + Cl2(g). What mass of Cl2 can be produced from 41.8 g of MnO2 with an excess of

    asked on March 30, 2016
  55. Chemistry

    Consider this equilibrium: N2O4(g) + heat NO2(g). Initially, a 1.0 L container is filled with 2.0 mol of NO2. As the system approaches equilibrium, what happens to the rate of reaction of NO2 breaking down?

    asked on April 29, 2011
  56. Physics

    ssm By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with v1 = 2.95 m/s and v2 = 1.70 m/s. As the plate falls, its momentum has only a vertical component, and no component parallel to the

    asked on April 1, 2008
  57. english

    i am reading A Girl Threatened by Sexual Exploitation by Harriet Jacobs. Can someone please explain what this excerpt mean? " My master began to whisper foul words in my eat. Young as I was, I could not remain ignorant of their import. I tried to treat

    asked on May 26, 2019
  58. Physic

    Why do protons in a very large nucleus have a greater chance of flying apart by electrical repulsion?

    asked on November 13, 2007
  59. english

    i am reading A Girl Threatened by Sexual Exploitation by Harriet Jacobs. Can someone please explain what this excerpt mean? "No matter whether the slave girl be as black as ebony or as fair as her mistress. In either case, there is no shadow of law to

    asked on May 27, 2019
  60. Physics

    Block B in the figure below weighs 713 N. The coefficient of static friction between block and table is 0.20. Assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary.

    asked on November 18, 2010
  61. english

    Please explain this sentence. "I tried to treat them with indifference and contempt". Thank you

    asked on June 6, 2019
  62. Business math

    Order for 620 dresses from China, cost is $40 a gown, markup based on selling is 76%, what is the selling price of each gown?

    asked on September 26, 2014
  63. physics

    An X-ray tube used for cancer therapy operates at 4.04 MV with a beam current of 23.4 mA striking a metal target. Calculate the power of this beam.

    asked on February 12, 2014
  64. Math

    what is the equation for the perpendicular bisector of the line segment whose endpoints are (-7,2) (-1,-6)

    asked on November 29, 2012
  65. Trigonometry

    The tires on a car have radius 14 inches. Find the angular speed of the car tire in revolutions per second when it is traveling 70 mph. Find the angular speed at 80 mph. The tires on a car are 15 inches. Find the linear speed of the car when the tires are

    asked on January 21, 2012
  66. Physics

    The artificial sweetener NutraSweet is a chemical called aspartame (C14H18N2O5). (a) What is its molecular mass (in atomic mass units)? 294.13 u (b) What is the mass (in kg) of an aspartame molecule? kg I was able to find the mass units but I'm having

    asked on April 27, 2008
  67. Algebra

    A diver begins at sea level and descends vertically at a rate of 2 1/2 feet per second. How long does the Diver take to reach -15.6 feet?

    asked on September 22, 2015
  68. math

    Divide 7/24 by 35/48 and reduce the quotient to the lowest fraction. A. 245/1152 B. 4/10 C. 2/5 D. 42/48

    asked on April 12, 2012
  69. Chemistry

    Consider this equilibrium: N2O4(g) + heat NO2(g). Initially, a 1.0 L container is filled with 2.0 mol of NO2. As the system approaches equilibrium, what happens to the rate of reaction of NO2 breaking down?

    asked on April 29, 2011
  70. chemistry

    Could someone please tell me if I did this question correctly? An incomplete combustion reaction of 12.125 grams of propane proceeds as follows: 2C3H8 + 11O2 = 3CO2 + 4H2O + 2CO + C(s).How many grams of solid carbon residue are produced as a product? my

    asked on October 13, 2009
  71. algebra 1

    A very old vending machine accepts only nickels (n) and dimes (d). Candy costs up to $0.50, but sometimes the machine will dispense candy without any coins being inserted into the machine. Which inequality shows all of the ways to obtain a candy bar from

    asked on January 13, 2015
  72. science

    In the system shown in the figure , block A has mass m_A = 2.08 kg, block B has mass m_B = 0.370 kg, and the rope connecting them has a nonzero mass 0.203 kg. The rope has a total length 1.03 m and the pulley has a very small radius. Let d be the length of

    asked on January 18, 2011
  73. geometry

    Triangle ABC, AB=8, BC=10, and AC=12, M is the midpoint of AB, and N is the midpoint of BC. What is the length of MN?

    asked on January 1, 2011

    A balloon at a pressure of 755 torr and a volume of 5.00 L was allowed to rise in the atmosphere to a point at which the pressure inside and outside the balloon was 697 torr. What was the volume of the balloon at that altitude, assuming the temperature was

    asked on December 19, 2012
  75. Physics

    A puck of mass 0.165 kg, initially resting on ice, is hit by a stick to gain a speed of 32.0 m/s and then slides 25.0 m to lose 5.00% of its kinetic energy. (a) What is the work done on the puck by the stick? (b) What is the kinetic friction coefficient

    asked on October 11, 2014
  76. chemistry

    glycine and lysine, have the following values of the relevant acid dissociation constants (pKa) glycine, pKa=2.35 lysine,pKa=10.79 For an aqueous solution of glycine alone, calculate the value of pH at which the ratio of the concentration of neutral

    asked on August 26, 2014
  77. english

    what does pious hearted mean?

    asked on June 6, 2019
  78. physics

    A CD has a mass of 17.4 g and a radius of 6.01 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 20.0 rad/s in 0.901 s. Assuming the CD is a uniform solid disk, determine the net torque acting on it.

    asked on March 8, 2012
  79. physics

    A rifle with a muzzle velocity of 480 m/s shoots a bullet at a target 45.6 m away. How high above the target must the rifle barrel be pointed to ensure that the bullet will hit the target? Neglect air resistance.

    asked on September 7, 2014
  80. physics

    Andy (mass 80 kg) uses a 3.0 m long rope to pull Bob (mass 60kg) across the floor (uk= .2) at a constant speed of 1.0 m/s. Bob signals to Andy to stop by plucking the rope, sending a wave pulse forward along the rope. The pulse reashes andy 150 ms later.

    asked on September 24, 2010
  81. Math - Vector Geometry

    what is the cartesian equation of the parametric equations x=2sin(2t) and y=4cos(2t) need help badly!!!!!!!

    asked on September 7, 2008
  82. physics

    A system undergoes a two-step process. In the first step, the internal energy of the system increases by 368 J when 144 J of work is done on the system. In the second step, the internal energy of the system increases by 24 J when 248 J of work is done on

    asked on April 26, 2008
  83. statistics

    Can a percentile have the VALUE of 517? Can a percnetile have the VALUE -5.8? Can a percentile have the RANK 517? Can a percnetile have the RANK -5.8?

    asked on August 29, 2012
  84. Economics

    Supply is Demand is Scenario A elastic elastic Scenario B elastic inelastic Scenario C inelastic elastic Scenario D inelastic inelastic Which scenario describes the market for oil in the long run? A. A B. B C. C D. D

    asked on November 29, 2011
  85. Physics

    Concept Simulation 3.2 reviews the concepts that are important in this problem. A golfer imparts a speed of 32.9 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a)

    asked on April 1, 2008
  86. physics

    A car is traveling 26 m/s when the driver sees a child standing in the road. He takes 0.8 s to react, then steps on the brakes and slows at 6.0 m/s2. How far does the car go before it stops?

    asked on February 10, 2008
  87. Calculus

    find the approximate volume in cubic units of the solid created when the region under the curve y = sec(x) on the interval [0, pi / 3 ] is rotated around the x-axis.

    asked on June 19, 2018
  88. chemistry

    How many grams of table sugar (C12H22O11) will be needed to make 3.5 L of a 11.5 M solution?

    asked on July 27, 2015
  89. Math

    what is the equation for the perpendicular bisector of the line segment whose endpoints are (-7,2) (-1,-6)

    asked on November 29, 2012
  90. grammar

    Ray Bradbury is also a writer of science fiction. what is the subject and the simple subject?

    asked on August 23, 2009
  91. Business

    Assume the role of a small business owner. You have little funds to put into insurance and protection for your company. You have to decide where your extra funds will be stretched. Is it more important for you as a business owner to protect your business

    asked on January 20, 2009
  92. Physics

    A 2.50 g bullet, traveling at a speed of 435 m/s, strikes the wooden block of a ballistic pendulum, as shown. The block has a mass of 270 g. (a) Find the speed of the bullet/block combination immediately after the collision. m/s (b) How high does the

    asked on April 1, 2008
  93. math

    You have 2 digits, 2 numbers, reverse digits and 54 if the difference and the sum of all is 10 I'm not clear what you're asking, could you clarify what the conditions are for us please? My grandson came home with the problem that he wrote out on a piece of

    asked on August 31, 2006
  94. Chem

    Calculate the volume of .300 M NaOH needed to prepare a pH=3.50 buffer with 250ml of .075M HF solution. pKa (HF) = 3.15

    asked on February 11, 2012
  95. physics

    a high speed sander has a disk of 2.74 cm in radius that rotates its disks about the axis at a constant rate of 503 rev/min. determine the linear speed of a point 2.33 cm from the disk's center. answer in units of m/s

    asked on October 18, 2007
  96. science

    explain how water can transfer energy by conduction and by convection.

    asked on June 3, 2008
  97. Physics

    At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds. During these two seconds, how far does it go? i still cant get this one right. i think im not doing the formula right

    asked on September 2, 2007
  98. physics

    Sally travels by car from one city to another. She drives for 29.0 min at 63.0 km/h, 37.0 min at 32.0 km/h, and 14.0 min at 26.0 km/h, and she spends 14.0 min eating lunch and buying gas.

    asked on September 13, 2016
  99. Grammar- Capitaliation

    Assistant dean Shirin Ahmadi recommended offering more language courses. We went to the mark taper forum to see a production of angels in america. Lydia's aunt and uncle make modular houses as beautiful as modernist works of art We amused ourselves on the

    asked on March 3, 2012
  100. physics

    A mass of 0.04 kg is attached to a cord passing through a small hole in a frictionless, horizontal surface. The mass is initially orbiting with speed 4.9 m/s in a circle of radius 0.4 m. The cord is then slowly pulled from below, decreasing the radius of

    asked on October 19, 2011


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