Most popular questions and responses by SAM
  1. Physics

    While working on her bike, Amanita turns it upside down and gives the front wheel a counterclockwise spin. It spins at approximately constant speed for a few seconds. During this portion of the motion, she records the x and y positions and velocities, as

    asked on August 19, 2012
  2. Statistics

    The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket. Airfares were based on the total ticket value, which consisted of the price charged by the airlines plus any additional taxes and fees. Assume domestic

    asked on June 11, 2014
  3. English

    chapter 14 sentence check 2... Although everything about the Nazis filled the Dutch spy with ____ (convert), his assignment was to ___(convert)peoples pain.

    asked on December 3, 2012
  4. Math

    why didn't klutz do any home work on saturday also what did the girl melon say when the boy melon proposed marriage

    asked on April 15, 2009
  5. Reading

    In adventures of Isabel the only one of Isabel's enemies who survives is a? A.the bear B. the witch C. the giant D. the doctor

    asked on February 8, 2016
  6. calculus

    Consider a window the shape of which is a rectangle of height h surmounted by a triangle having a height T that is 1.1 times the width w of the rectangle If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter.

    asked on April 1, 2013
  7. Physics

    A child's toy consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. (Intro 1 figure) The spring has a spring constant k, the ball has a mass m, and the ramp rises a height y above

    asked on October 31, 2008
  8. Statistics / Math

    A tourist in Ireland wants to visit seven different cities. If the route is randomly selected, what is the probability that the tourist will visit the cities in alphabetical order?

    asked on February 26, 2008
  9. biology

    1. Record your observations of the roots of the bean and radish plants in the appropriate data chart. Be sure to include a sketch of each plant’s roots. Answer: Data Chart: Bean Plant Nodules present? Number of nodules Number of pink nodules Number of

    asked on June 1, 2011
  10. physics

    a 20 kg loudspeaker is suspended 2m below a ceiling by two 3m-long cables that angle outward at equal angles. what is the tension in the cables?

    asked on November 11, 2010
  11. chemistry

    what is the molality of a 10.5% by mass glucose solution?. density of the solution is 1.03g/ml can someone please explain how to do this question. please and thank you

    asked on February 10, 2011
  12. math

    which expression represents 5 less than y? A. y-5 B. 5-y C. y/5 D. 5y-1

    asked on February 22, 2016
  13. calculus

    If f is the focal length of a convex lens and an object is placed at a distance p from the lens, then its image will be at a distance q from the lens, where f, p, and q are related by the lens equation 1/f = 1/p + 1/q What is the rate of change of p with

    asked on May 6, 2011
  14. Chemistry

    When 20.5g of methane and 45.0g of chlorine gas undergo a reaction that has a 75.0% yeild, what mass of chloromethane forms?

    asked on September 29, 2009
  15. math

    Sheldon needs to buy 8 gallons of ice cream. Cold Farms price small size $2.50 for 1 pint large size $4.50 for 1 quart Cone Dreams price of small size $4.25 large size $9.50 for 1 gallon Which size container of Cold Farm ice cream is the better deal?

    asked on December 14, 2014
  16. Spanish

    What is the correct way to say "I prefer milk" in Spanish? A. Yo prefero leche B. Yo prefiero leche*** C. Yo preferir leche D. Yo priefero leche

    asked on November 5, 2016
  17. math

    use the formula v=lwh to find the volume of a rectangular prism with the following dimensions: • length = 7 in. • width = 4 in. • length = 3 in. a. v = 14 in.3 b. v = 31 in.3 c. v = 49 in.3 d. v = 84 in.3

    asked on February 25, 2018
  18. Analytical Chemistry

    Current is applied to an aqueous solution of calcium sulfide. Multiple choice help please??! What is produced at the cathode? A) H2(g) B) S(s) C) O2(g) D) Ca(s) What is produced at the anode? A) O2(g) B) H2(g) C) Ca(s) D) S(s)

    asked on March 30, 2013
  19. Physics

    An engine rated at 5.0x10^4 watts exerts a constant force of 2.5x10^3 newtons on a vehicle.determine the average speed of the vehicle.

    asked on May 10, 2016
  20. calculas

    Use left and right endpoints and the given number of rectangles to find two approximations of the area of the region between the graph of the function and the x-axis over the given interval. (Round your answers to four decimal places.) g(x) = 7 sin x, [0,

    asked on May 7, 2016
  21. chemistry

    An unknown metal is found to have a density of 19.300 g/cm^3 and to crystallize in a body-centered cubic lattice. The edge of the unit cell is found to be 0.31627 nm. Calculate the atomic mass of the metal. Im not sure how to approach this problem...when i

    asked on January 24, 2011
  22. Language Arts

    Which element is shared by both "Stolen Day" and "The Night the Bed Fell"? a)strong imaginations b)loving parental figures c)harsh family rules d)ill children

    asked on September 18, 2017
  23. physics

    Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where V1 = 5.0 10-3 m3 and V2 = 20.0 10-3 m3.

    asked on December 6, 2013
  24. Math

    A survey about the student government program at a school finds the following results. 190 students like the program 135 students think the program is unnecessary 220 students plan on running for student government next year. If a circle graph were made

    asked on March 17, 2016
  25. math

    32.17Grams rounded to the nearest gram

    asked on May 21, 2017
  26. MATH


    asked on May 19, 2015
  27. Math-PLEASE check my answers

    What types of problems can be solved using the greatest common factor? What types of problems can be solved using the least common multiple? Complete the explanation. *** Use the words 'same' and 'different' to complete the following sentences.*** Problems

    asked on September 11, 2014
  28. Precalculus

    The roots of \[z^7 = -\frac{1}{\sqrt{2}} - \frac{i}{\sqrt{2}}\]are $\text{cis } \theta_1$, $\text{cis } \theta_2$, $\dots$, $\text{cis } \theta_7$, where $0^\circ \le \theta_k < 360^\circ$ for all $1 \le k \le 7$. Find $\theta_1 + \theta_2 + \dots +

    asked on January 27, 2017
  29. geometry

    Martin drew a pair of perpendicular lines and a pair of parallel lines. Which of these statements best compares the pairs of perpendicular and parallel lines? Answer A: Perpendicular and parallel lines always have a common endpoint. B: Perpendicular and

    asked on September 25, 2011
  30. algebra

    The loudness, L L, of a sound (measured in decibels, dB) is inversely proportional to the square of the distance, d d, from the source of the sound. Round to 3 decimal places. A person 15 feet from a jetski, it is 75 decibels loud. How loud is the jetski

    asked on February 9, 2016
  31. Math

    A shop owner blends three types of coffee,A,B, the ratio 3:5:7 a) calculate the weight of each type of coffee in 45kg of three blended mixture. b) given that type A coffee cost $7 per kg, type B coffee costs $10 kg and type C coffee costs $13 per kg,

    asked on December 31, 2016
  32. Algebra 1

    A square painting is surrounded by a frame. the outside edges of the frame are x inches in length, and the frame is 3 inches thick. What is the total area of the frame? A)-12x+36 B)12x-36 C)x^2+12x+36 D)x^2-12x-36 Is it C or D?

    asked on December 22, 2016
  33. History

    which of the following was a significant part of the civil rights movement? a.) the civil rights movement got national attention. b.) laws were passed as a result of the civil rights movement. c.) the president provided support of the civil rights

    asked on March 23, 2016
  34. Chemistry

    Iron (III) Nitrate reacts with Sodium Carbonate to form a precipitate. Be sure to indicate oxidation states (charges on each ion) & the precipitate. Skeletal Equation: Ionic Equation: (assume all ions are aqueous, dissociated free ions) NET Ionic Equation:

    asked on January 20, 2019
  35. Chemistry

    A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in kilojoules per mole of KBr?

    asked on March 20, 2013
  36. math

    Is this the right way to answer this question? A physics exam consists of 9 multiple-choice questions and 6 open-ended problems in which all work must be shown. If an examinee must answer 7 of the multiple-choice questions and 3 of the open-ended problems,

    asked on August 23, 2009
  37. Literature

    Jack London never actually set foot north of California a. true b. false *****

    asked on October 4, 2017
  38. math

    A study was made of 200 preschoolers to determine if they watched some particular television shows. The choices were Little Galileo, Super Reader and Prehistoric Train. The results are I. 22 preschoolers did not watch any of these shows II. 73 preschoolers

    asked on February 19, 2019
  39. math

    What Happens to People Who don't Know Toothpaste From Putty?

    asked on November 22, 2008
  40. physics

    A helicopter weighs 3920 newtons, caculated the force on it if it is ascending up at a rate of 2m/s squre ,what wil b force on helicopter if it is moving up with the constant speed of 4m/s .

    asked on September 15, 2014
  41. science

    A particle beam is made up of many protons each with a kinetic energy of 3.25times 10-15J. A proton has a mass of 1.673times 10-27kg and a charge of +1.602times 10-19C. What is the magnitude of a uniform electric field that will stop these protons in a

    asked on August 28, 2014
  42. Physics

    An automobile with 0.310 m radius tires travels 85,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?

    asked on March 17, 2014
  43. Physics

    how much energy is required to change 40 g of ice at -10 C to steam at 110 C?

    asked on January 12, 2014
  44. science

    if the specifc heat of iron = 0.46J/g C,how much heat is needed to warm 50g of iron from 20C to 100C -- I do not know how to make the celcius o above the temperature number my anwswer Q = Mx(delta)TxC Q=50gx80Cx0.46J/gC Q = 1840 Joules Delta = the triangle

    asked on April 25, 2008
  45. Social Studies Help ASAP Please!

    Resistance to Immigration Nativists believed that some immigrants did not fit into American culture because their customs were to different ---> Prejudice and violence grew as the number of Chinese immigrants increased ---> ? Based on your reading, which

    asked on February 25, 2017
  46. Social Studies (Ms. Sue) Please Proofread

    1. Population density is the number of people that live in a region divided by the number of (1 point) roads. square miles or kilometers in the region.•• waterways. people who used to live there. 2. How do demographers figure out population growth? (1

    asked on November 17, 2015
  47. Chemistry

    Complete the charge balance equation for an aqueous solution of H2CO3 that ionizes to HCO3^- and CO3^2- ______ = ______ + _______ + _______ Given choices: [HCO3^-],[CO3^2-], [OH^-], 2[H^+], [H2CO3], 2[CO3^2-], 3[H^+], {H^+] I don't understand how to do

    asked on February 4, 2013
  48. math

    Mark averaged 60 miles per hour during the 30-mile trip to college. Because of heavy traffic he was able to average only 40 miles per hour during the return trip. What was Mark's average speed for the round trip?

    asked on March 24, 2013
  49. Physics

    A dentist's drill starts from rest. After 3.20 s of constant angular acceleration it turns at a rate of 2.7 104 rev/min. (a) Find the drill's angular acceleration. (b) Determine the angle (in radians) through which the drill rotates during this period.

    asked on November 4, 2010
  50. calculus

    A box weighing 450 N is hanging from two chains attached to an overhead beam at angles of 70 degrees and 78 degrees to the horizontal. Determine the tensions in the chains.

    asked on February 14, 2010
  51. Physics

    to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts

    asked on November 7, 2012
  52. Physics II

    A test charge of +2 μC is placed halfway between a charge of +6 μC and another of +4 μC separated by 10 cm. What is the magnitude of the force on the test charge?

    asked on January 13, 2016
  53. art

    in near eastern culture the winged genius often represented in art and artifacts was a blank god a.destructive b.creative c.understanding d.benevolent

    asked on January 14, 2015
  54. math/ratios

    There are 77 students in the student council. The ratio of girls to boys is 7:4. How many girls are in the student council?

    asked on March 18, 2013
  55. Analytical Chemistry

    Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. CO2(g) CO2(aq) The acid dissociation constants listed in most standard reference texts for carbonic acid actually

    asked on February 22, 2013
  56. Chemistry

    List the following compounds in order of increasing electrical conductivity: 0.1 M formic acid (HCOOH), 0.1 M (NH4)3PO4, 0.1 KCl, and 0.1 M glucose solution (C6H12O6). Why are they in that order?

    asked on November 6, 2013
  57. math

    The area of a trapezoid may be determined by using the formula A = (h/2)(a+b), where "A" stands for area, "h" stands for the height of the trapezoid, and "a" and "b" stand for the lengths of the bases of the trapezoid. If the height of the trapezoid is12

    asked on October 23, 2018
  58. Maths

    We have Rs.100/-.If we spend Rs.100/-and balance is Rs.102/-,show how is Rs.2/-extra Spent Balance Day 1 Rs 40 Rs 60 Day 2 Rs 30 Rs 30 Day 3 Rs 18 Rs 12 Day 4 Rs 12 Rs 00 -------- -------- Total Rs 100 Rs102......?

    asked on February 28, 2016
  59. Math

    Two cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. Find the probability of the given event. A pair is not drawn.

    asked on November 8, 2012
  60. Science

    Which Of the following differs when comparing the deep ocean to the intertidal zone?? A) Need for Energy B) Salinity C) The amount of sunlight* D) Reliance on phytoplankton

    asked on February 3, 2014
  61. math

    One pipe fills a storage pool in 20 hours. A second pipe fills the same pool in 15 hours. when a third pipe is added and all three are used to fill the pool , it takes only 6 hours. Find how long it takes the third pipe todo the job.

    asked on December 4, 2012
  62. Social Studies

    Which of the following technologies required the measurement of the stars for navigation? A. compass** B. lateen C. Mercator projection D. astrolabe

    asked on December 6, 2018
  63. Pre-Calculus

    f(x) = cos(x) on the interval [−2π, 2π] (a) Find the x-intercepts of the graph of y = f(x). (Enter your answers as a comma-separated list.) (b) Find the y-intercepts of the graph of y = f(x). (Enter your answers as a comma-separated list.) (c) Find the

    asked on November 29, 2015
  64. math 10

    a British researcher developed a formula to determine walking or running speed based on hip height and stride length. The formula is s= 0.78l ^1.67/ h^1.17 where s is speed in meters per second l is stride length in meters, and hi is the individual hip

    asked on December 5, 2017
  65. chemistry

    calculate the mass of potassium hydrogen phthalate needed to prepare a 0.1M solution in a 250 ml volumetric flask given that the molar mass of potassium hydrogen phthalate is 204,23g/mol

    asked on August 3, 2016
  66. physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 94.0 kg. The mass of the rock is 0.350 kg. Initially the wagon is rolling forward at a

    asked on October 22, 2011
  67. physics

    Use R = 8.2 × 10–5 m3 atm/mol K and NA = 6.02 × 1023 mol–1. The approximate number of air molecules in a 1 m3 volume at room temperature (300 K) and atomospheric pressure is:

    asked on June 24, 2009
  68. Algebra I

    Write is y=1/6 X +4 in standard form using integers a. -x -6y =24 b. -x+6y = 24 c. -x +6y =4 ***** d. 6x-y=24

    asked on November 3, 2017
  69. Chemistry (Re-post)

    A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. So this is my working out for this section, Step 1. Moles of CoSO4 = 0.0001694mg * 25mL *

    asked on January 21, 2015
  70. Analytical Chemistry

    Phosphoric acid is a triprotic acid with the following pKa values: pka1: 2.148 pka2: 7.198 pka3: 12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.45. To do this, you choose to use mix the two salt forms involved in the second

    asked on February 22, 2013
  71. physics

    Two Children,A and B, fire identical 10g ball bearing from a catapult. The elastic band of each catapult is elastically extended by 0.10m and then released to fire a the ball bearings. Child A's elastic band has a spring constant of 144 N/m. Calculate the

    asked on March 18, 2017
  72. Chem II

    PCl5 dissociates according to the reaction: PCl5(g) ↔ PCl3(g) + Cl2(g). One mole of PCl5 was placed in one liter of solution. When equilibrium was established, 0.5 mole of PCl5 remained in the mixture. What is the equilibrium constant for this reaction?

    asked on February 29, 2012
  73. Physics

    An electron is acted upon by a force of 7.00×10−15 N due to an electric field. Find the acceleration this force produces in each case: The electron's speed is 1.00 km/s . a=??m/s2 The electron's speed is 2.50×108 m/s and the force is parallel to the

    asked on October 26, 2017
  74. Trignometry

    In Philadelphia the number of hours of daylight on day t (t is the number of days after january 1) is modeled by the function L(t)= 12+2.83sin((2*Pi)/365(t-800) a. Which day have about 10 hours of daylight? b. How many days of the year have more than 10

    asked on April 15, 2017
  75. LA

    How is Barrio Boy characteristic of nonfiction and "A Day's Wait" characteristic of fiction? Ernesto in Barrio Boy is a believable character, while the boy in "A Day's Wait" is not believable.

    asked on December 8, 2016
  76. Chemistry

    What is the activity coefficient of H^+ in a solution containing 0.073 M HCl and 0.0090 M Ca(ClO4)2? What is the pH of the solution? I believe I have to find the ionic strength of the solution first, but I don't know how to find it when 2 solutions are

    asked on February 4, 2013
  77. Analytical Chemistry

    How many milliliters of 0.0560 M EDTA are required to react with 50.0 mL of 0.0170 M Cu^2+? With 50 mL of 0.0170 M Sc^3+? My work so far: (50mL)(0.0170mmol/mL)= 0.85 mmol Cu^2+ I'm not sure how to do the rest. Please help.

    asked on March 4, 2013
  78. Trigonometry/Geometry

    In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few

    asked on November 19, 2013
  79. physics

    In a police ballistics test, a 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block at rest. The bullet goes through the block almost instantaneously and emerges with 50.0% of its original speed. What is the speed of the block just after the

    asked on May 13, 2015
  80. math

    What percent of 94 is 23? A.n/94=23/100 B.23/94=n/100 C.94/n=23/100 D.23/94=100/n

    asked on December 10, 2013
  81. Physics

    As seen from above, a playground carousel is rotating counterclockwise about its center on frictionless bearings. A person standing still on the ground grabs onto one of the bars on the carousel very close to its outer edge and climbs aboard. Thus, this

    asked on November 3, 2012
  82. Algebra 1 I need help!!!!!!!!!!!!!!!!

    8.A number raised to a negative exponent is negative. Is it always , never, or sometimes. 7. Evaluate 1/2a^-4b^2 a = -2 and b = 4 remember a^to the negative 4 6. Simplify. Write in scientific notation. (9 x 10^-3)^2 Thanks to anyone who helps right away

    asked on February 4, 2013
  83. Physics

    A basketball player is running at 5.00 m/s directly toward the basket when he jumps into the air to dunk the ball. He maintains his horizontal velocity. (a) What vertical velocity does he need to rise 0.750 meters above the floor? (b) How far from the

    asked on March 17, 2014
  84. Chemistry

    Why is (E)-1,2-diisopropylethene more stable than (Z)-1,2-diisopropylethene? Why are they more stable than 1,1-diisopropylethe? And doesn't the bond angle between the C=C-C carbons increase with (Z)-1,2-diisopropylethene > (E)-1,2-diisopropylethene >

    asked on June 17, 2009
  85. chemistry

    What substance is produced at the cathode during the electrolysis of molten calcium bromide, CaBr2? Assume standard conditions.

    asked on April 5, 2011
  86. Math

    Becky and James have a total of 4 2\8 feet of yarn.Becky has 1 5\8 feet of many feet of yarn does James have?

    asked on March 14, 2018
  87. Language Arts 6A

    Which of theses is a category used in the passage to contrast falcons and hawks?

    asked on December 5, 2015
  88. science

    At 3:15 one afternoon, the temperature over the land reaches its highest value for the day — about 89°F. The temperature over the adjacent water is about 72°F. What would the expected weather conditions be at this time? A. Cloudy skies and a sea breeze

    asked on March 21, 2015
  89. physics

    If a boat and its riders have a mass of 800 kg and the boat drifts in at 1.5 m/s how much work does Sam do to stop it?

    asked on May 14, 2011
  90. Static Friction..I really Have no Idea

    A 0.40 kg block rests on a desk. The coefficient of static friction is 0.20. You push the side of the block but do not have a spring scale to measure the force you use. The block does not move. Which statement is true about the force of static friction? It

    asked on December 21, 2014
  91. Math

    Multiply & write in simplest form: The mississippi river is about 23/25 the length of the missouri river. If the missouri river is 2,540 miles long, how long is the mississippi river? Thanks

    asked on September 12, 2012
  92. physics

    A piano wire has length L and mass M. If its fundamental frequency is f, its tension is: i got T=(lambda*f)^2m/L, but their answer is 4LMF^2 and i cant figure out how to get that

    asked on June 21, 2009
  93. Physics

    A skateboarder shoots off a ramp with a velocity of 6.7 m/s, directed at an angle of 53° above the horizontal. The end of the ramp is 1.0 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the

    asked on October 5, 2011
  94. math

    In 6 hours,an experienced cook prepares enough pies to supply a local restaurant's daily order. Another cook prepares the same number of pies in 7 hours. Together with a third cook, they prepare the pies in 2 hours. Find how long it takes the third cook to

    asked on December 4, 2012
  95. Math

    An equilateral trapezoid ABCD with height 2 units has all its vertices on the parabola y=a(x+1)(x−5). What is the value of a, if points A and D belong to the x−axis and m∠BAD=30o?

    asked on January 5, 2019
  96. Chemistry

    A decomposition reaction has a rate constant of 0.0019 yr -1. ( a) What is the half-life of the reaction? ______ yr (b) How long does it take for [reactant] to reach 12.5% of its original value? ______ yr

    asked on December 2, 2011
  97. Biology

    In the small intestine, the digestion of food molecules is completed and absorption occurs. Structures from the circulatory system are associated with the small intestine. Explain how these structures assist the small intestine in its function.

    asked on November 25, 2009
  98. Math

    2. A researcher tagged 40 giant turtles in 2008. In 2009 she returned and captured 50 turtles, 16 of which were tagged. in 2010 she returned again and captured 30 turtles 8 of which were tagged. a: Use a proportion to estimate the turtle population for

    asked on May 13, 2015
  99. Calc 2: Area under the curve

    Find the area of the region enclosed between y=2sin(x and y=3cos(x) from x=0 to x=0.4pi Hint: Notice that this region consists of two parts. Notice: I'm getting 1.73762 but apparently that is wrong.

    asked on April 20, 2011
  100. science

    if it takes 31,500 joules of heat to warm 750g of water, what was the temperature change? My answer: Q = (M) (DeltaT) (c) Delta T=Q Delta T = 31,500J -------- 750gx 1.0cal/gCo Delta T = 42oC

    asked on April 26, 2008


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