Popular questions and responses by joey
  1. Precalculus

    The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of -0.4 . Suppose that the height of the candle after 13 hours is 24.8 centimeters. What

    asked on March 24, 2014
  2. Pre Calculus

    A piece of cardboard measuring 13 inches by 11 inches is formed into an open-top box by cutting squares with side length x from each corner and folding up the sides. a. Find a formula for the volume of the box in terms of x b. Find the value for x that

    asked on April 29, 2016
  3. History

    Which describes the terms of the agreement at the 38th parallel? A. This armistice defined the 38th parallel as the dividing line between the careers, and though it called for cease-fire, it did not cite in official end of that war. B. This nonaggression

    asked on August 1, 2019
  4. Vince

    Please show work for Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? thank you very much for your help

    asked on September 17, 2015
  5. Chemistry

    Write the balanced dissociation equation for MgCl2. (1 mark) MgCl2(s) + H2O(l) ==> Mg^+2(aq) + 2Cl^-(aq) b) In 300.0 mL of a 0.50 M MgCl2 solution, what would be the concentration of the chloride ions?

    asked on July 27, 2020
  6. physics

    Extreme-sports enthusiasts have been known to jump off the top of El Capitan, a sheer granite cliff of height 910m in Yosemite National Park. Assume a jumper runs horizontally off the top of El Capitan with speed 5.0m/s and enjoys a freefall until she is

    asked on April 21, 2012
  7. science

    Suppose that the 1.3 km span of the golden gate bridge had no expansion joints. Calculate how much longer the bridge would be if the temperature of the bridge increases by 35 degrees celsious

    asked on March 1, 2013
  8. Chem 400

    Direct reaction of solid iodine (I2) and gaseous chlorine (Cl2) produces an iodine chloride,(IxCly), a bright yellow solid. 0.678 g of iodine (I2) is mixed with 0.851 g of chlorine (Cl2). After the elements react, some chlorine is left over along with a

    asked on October 1, 2014
  9. physics

    A uniform solid sphere rolls down an incline. (a) What must be the incline angle if the linear acceleration of the center of the sphere is to have a magnitude of 0.20g? 1° (b) If a frictionless block were to slide down the incline at that angle, would its

    asked on January 5, 2011
  10. Trigonometry

    Mountain officials want to build a new ski lift from B to C as shown in the figure below. The distance from A to C is 1480 feet. They measure angle DAC to be 32 degrees and angle DBC to be 18 degrees. What is the distance A from to B? Round your answer to

    asked on March 18, 2014
  11. Statistics

    A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution, with a population standard deviation of 5.10 gallons. A random sample of 60 days shows

    asked on October 27, 2013
  12. 6th grade math

    A chocolate bar is separated into several equal pieces. If one person eats 1/4 of the pieces, and a second person eats 1/2 of the remaining pieces, there are six pieces left over. Into how many pieces was the original bar divided?

    asked on August 27, 2009
  13. trig

    Find csc(theta), tan (theta), and cos (theta), where theta is the angle shown in the figure. Give exact values, not decimal approximations c=10 b=7 a=7.14 the right angle is locate between sides a and b and the theta angle is an acutle angle sides b and c.

    asked on March 24, 2014
  14. Biology- check my answer (diff one)

    Which of the following are true concerning living things? Check all that apply. A)They contain a vital force absent in nonliving things. B)They are composed of molecules that contain carbon-carbon bonds. C)They undergo chemical reactions to use energy they

    asked on December 19, 2012
  15. Math 111

    Find a 4 degree polynomial having zeros -6,-3,2 and 6 and the coefficient of x^4 equal 1 The "coefficient of x^4 equal 1" is really throwing me off. Thanks.

    asked on November 5, 2011

    A circular curve of highway with radius 200m is designed for traffic moving at 100km/h, and is banked so that cars can make the curve even without friction at that speed. What is the correct angle of banking for this curve? Show steps, please.

    asked on April 19, 2010
  17. biology

    In guinea pigs, the allele for a rough coat (R) is dominant over the allele for a smooth coat (r). A heterozygous guinae pig (Rr) and a homozygous recessive guinea pig (rr) have a total of nine offspring. The punnett square for this cross shows a 50

    asked on February 27, 2010
  18. Calculus

    A construction company wants to build a rectangular enclosure with an area of 1000 square feet by fencing in three sides and using its office building as the fourth side. Your objective as supervising engineer is to design the enclosure so that it uses the

    asked on August 9, 2011
  19. Physics

    A wheel rotating initially at an angular velocity of 1.0 rad/s, accelerates over a 10 S interval at a rate of 0.1 rad/s^2. What angular displacement does the wheel undergo in this 10 S interval, in terms of revolutions?

    asked on November 21, 2016
  20. math

    Can someone help with me this question? 1. Lea spent $25 of the money she saved. She still has 60% of her money left. How much does have left? 0.60 x 25=$15? 2. A 2.6L container of juice costs $3.00. How much are you paying for 1 L?

    asked on November 14, 2011
  21. math

    A standard deck of cards has had all the face cards (Jacks, queens, and kings) removed so that only the ace through ten of each suit remains. A game is played in which two cards are drawn (without replacement) from this deck and a six-sided die is rolled.

    asked on February 24, 2011
  22. chemistry

    What is the osmotic pressure at 25°C of a solution containing 0.50 mol/L of Al(NO3)3?

    asked on December 14, 2019
  23. American Governent

    1. What type of power does the Constitution grant to the Supreme Court? (1 point) executive power federal power judicial power legislative power 2. Which are examples of judicial restraint in the Supreme Court? Select all that apply. (3 points) The verdict

    asked on December 12, 2016
  24. Biology-check my answer

    Hershey and Chase used the 35S isotope to label proteins. How does this isotope differ from the 32S isotope found in greatest natural abundance, and why did they choose 35S instead of 32S? A)35S has more protons than 32S; Hershey and Chase used it because

    asked on December 19, 2012
  25. government

    What is the relationship between global conflicts, international trade, and foreign relations among the nations of the world?

    asked on May 26, 2020
  26. Calculus

    The management of the UNICO department store has decided to enclose an 870 ft2 area outside the building for displaying potted plants and flowers. One side will be formed by the external wall of the store, two sides will be constructed of pine boards, and

    asked on April 13, 2015
  27. science

    A force of 20 n gives a ball an acceleration of 4.0 m/s3 on a lever frictionless surface. what is the mass of the ball?

    asked on June 17, 2014
  28. math

    express each answer in exponential form using the indicated bases 4x4x4x4,base 2

    asked on June 25, 2013
  29. Physics: Vectors

    A hiker walks 10.0 km[NE], 5.0 km[W], and then 2.0 km[S] in 2.5 h. (a) What is the hiker's displacement? (b) In what direction must the hiker set out, in order to return by the most direct route to the starting point? (c) If the hiker walks at a constant

    asked on June 19, 2012
  30. Geometry

    B is the midpoint of segment AC. AB= 5X and BC =3X+4 find AB, BC and AC

    asked on October 5, 2011
  31. physics

    An automobile traveling at 50.0 km/h has tires of 100.0 cm diameter. (a) What is the angular speed of the tires about their axles? 1 rad/s (b) If the car is brought to a stop uniformly in 25.0 complete turns of the tires (without skidding), what is the

    asked on January 5, 2011
  32. physics

    A plum is located at coordinates (-4.0 m, 0.0 m, 6.0 m). In unit-vector notation, what is the torque about the origin on the plum due to force F whose only component is indicated by each of the following equations? (a) Fx = 8.0 N ô = N · m (b) Fx = -5.0

    asked on January 5, 2011
  33. Calculus (optimization problem)

    A cyclinderical tank with no top is to be built from stainless steel with a copper bottom. The tank is to have a volume of 5ð m^3. if the price of copper is five times the price of stainless steel, what should be the dimensions of the tank so that the

    asked on March 24, 2010
  34. math

    what is 1.07 x 10^3 in standard form

    asked on November 8, 2017
  35. Geometry

    the steps that you would follow to recreate a triangle using a protractor, a string, and the AAS Congruence Theorem, written out in words. I'm lost know that you need two angles and a side.No clue how to explain. Please help I've been sitting here all day

    asked on October 26, 2017
  36. Pre Calculus

    A cylinder shaped can needs to be constructed to hold 200 cubic centimeters of soup. The material for the sides of the can costs 0.02 cents per square centimeter. The material for the top and bottom of the can need to be thicker, and costs 0.06 cents per

    asked on April 29, 2016
  37. Calculus

    Differentiate. g(x) = 5e^x√x

    asked on October 4, 2015
  38. Physics

    A 4.12 kg mass undergoes an acceleration along both the x and y directions. Ax = -2.60 m/s2 and Ay = 3.50 m/s2. Find the magnitude of the resultant force. Answer in units of N.

    asked on March 2, 2015
  39. physics, math

    Part A & B are 0.10m apart. A point charge of +3.0*10^-9C is placed at A and a point charge of +1.0*10^-9C is placed at B. X is a point on the straight line through A and B. If a third charge C or charge 1.5*10^-9 is placed at X, where must X be for the

    asked on September 14, 2014
  40. trig and geometry

    bernhardt and julia are observing an eagles nest in a tree. Julia is 75m from the tree, and sees it at an angle of elevation of 42 degrees A)How high up the tree is the nest B)Bernhardt is standing 30m behind julia. At what angle of elevation does he see

    asked on March 2, 2012
  41. science

    Does an ammeter consist of a loop of wire in a magnetic field?

    asked on June 6, 2011
  42. math

    jake has 3/4 of a dollar. maxwell has 1/10 of a dollar. do they have more or less than $1.00 in all

    asked on March 17, 2011
  43. Chemistry

    1- Determine the [OH-] and pH of a solution that is .250 M in HCO-3 2- Calculate the [H3O+] and pH of each polyprotic acid solution: a) .125 M H2CO3 b) .125 M H3C6H5O7

    asked on March 14, 2011
  44. English

    How do these develop theme of these allusions from Hamlet? 1. "I would have such a fellow whipped for o'erdoing Termagant" (II,ii,14) So basically Hamlet is telling his actors not over act during the play. 2. “For O, For O, the hobbyhorse is forgot”

    asked on November 11, 2010
  45. math

    what is the fraction between 4/9 and 5/9

    asked on May 16, 2010
  46. Math

    If 4 sin^2 θ - 3 is equal to 0 . What is the value of θ for 0° < θ < 90° ?

    asked on June 15, 2020
  47. Math

    How many terms of the A.P, 1+4+7+.......are required to make a sum of 590?

    asked on May 14, 2020
  48. Chemistry La

    An unknown solution may contain some of the cations listed below. One student preformed a series of experiments to determine what ions are in the solution. Based upon the experiments performed by the students, the results are as follows: a) On addition of

    asked on October 5, 2017
  49. Maths

    Solve algebraically: x^2 + y^2 = 18 x - 2y = -3. Thanks.

    asked on March 30, 2017
  50. Maths

    Prove algebraically that the difference between any two different odd numbers is an even number. Thanks.

    asked on March 30, 2017
  51. Math (Fraction Word Problem)

    You have three-fifths of a pizza leftover, and you plan to eat half of it for lunch. How much of the original pizza do you have left over? If I have 3/5 of a pizza leftover and I plan to eat 1/2 of it for lunch doesn't that mean you have to divide? This is

    asked on October 27, 2016
  52. Physic

    ON is the vertical plumb line.A horizontal force F applies at M to push the piston at O and N,with the help of rods MO,MN.The rods MO,MN have the same length,when the distance of ON is 200cm,the distance of M to the plumb line ON is 10cm.Assuming the

    asked on March 28, 2016
  53. Chemistry Dimensional analysis

    A cyclist rides at an average speed of 18 miles per hour. if she wants to bike 212km, how long in hours must she ride? What I have so far.. 212km(10^3 miles

    asked on February 7, 2016
  54. Chemistry

    A 0.200 g sample of carbon dioxide, CO2, has a volume of 525 mL and a pressure of 473 mmHg . What is the temperature of the gas in kelvins?

    asked on November 27, 2015
  55. Calculus

    The volume V of a growing spherical cell is V =4/3πr^3, where the radius is measured in micrometers (1 µm = 10^−6m). Find the average rate of change of V with respect to r when r changes from 3 to each of the following. i)3 to 6µm ii)3 to 4µm

    asked on October 31, 2015
  56. physics

    A novice golfer on the green takes three strokes to sink the ball. The successive dis- placements are 7 . 7 m to the north, 1 . 9 m 45 ◦ north of east, and 8 . 7 m 76 ◦ west of south. Starting at the same initial point, an expert (lucky) golfer could

    asked on October 29, 2015
  57. Chemistry

    How come lead is denser than copper though more copper atoms can fit into a same size cube than lead atoms can?

    asked on June 29, 2015
  58. chimistry

    The molar heat of fusion of lead (Pb) is 1.140 kcal/mol. How much heat must be added to 97.0 g of solid lead at its melting point in order for it to completely melt? A 1.44 kJ B 10.18 kJ C 12.48 kJ D 25.04 kJ

    asked on June 24, 2015
  59. Math 120

    Write 4logb(X)-1/3logb(y)+2logb(z)as a single logarithm Its log base b.

    asked on December 3, 2014
  60. Calculus

    A light is hung 15 ft above a straight horizontal path. If a man 6 ft tall is walking away from the light at the rate of 5 ft/sec, how fast is his shadow lengthening and at what rate is the tip of the man’s shadow moving?

    asked on October 6, 2014
  61. Chemistry 400/ Chem 1A

    A chemist mixes 5.216 g of potassium permanganate, 2.318 g of ethanol, and excess sulfuric acid. These chemicals react as follows: 4 KMnO4 + 5 C2H5OH + 6 H2SO4 ---> 4 MnSO4 + 5 CH3COOH + 2 K2SO4 + 11 H20 What mass of sulfuric acid is consumed in this

    asked on September 15, 2014
  62. Physics

    A 55.0kg cheerleader uses an oil-filled hydraulic lift to hold four 130kg football players at a height of 1.20m. If her piston is 19.0cm in diameter, what is the diameter of the football players' piston?

    asked on November 14, 2013
  63. phyics

    A hand exerciser utilizes a coiled spring. A force of 86.9 N is required to compress the spring by 0.0231 m. Determine the force needed to compress the spring by 0.0432 m.

    asked on November 12, 2013
  64. phyics

    An object on a vertical spring oscillates up and down in simple harmonic motion with an angular frequency of 25.1 rad/s. Calculate the distance d by which the spring stretches from its unstrained length when the object is allowed to hang stationary from

    asked on November 12, 2013
  65. phyics

    A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 1.1 m/s. Determine the amplitude A of the motion.

    asked on November 12, 2013
  66. physics

    The four tires of an automobile are inflated to a gauge pressure of 1.7 × 10 5 Pa. Each tire has an area of 0.023 m2 in contact with the ground. Find the weight of the automobile. Answer in units of N

    asked on February 12, 2013
  67. statistics

    Which of the following is NOT true with respect to the properties of probability? 0 < x < 1 P(S) = 1, where S is the sample space P(A) + P(Ac) = 0 If two events are independent then P(A and B) = P(A) * P(B)

    asked on November 15, 2012
  68. Differential Calc

    If: 0 = f(1) = a+b+c+d 2 = f(-2) = -8a+4b-2c+d 0 = f'(1) = 3a+2b+c 0 = f'(-2) = 12a-4b+c "since we now have four equations and four unknowns, we can determine unique solution. Solving for "a" and "b", a=, b=" Please show the steps, I am so confused and no

    asked on November 5, 2012
  69. Physics help!!

    A Styrofoam bucket of negligible mass contains 1.60 kg of water and 0.425 kg of ice. More ice, from a refrigerator at -14.8 degree C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket

    asked on April 16, 2012
  70. Physics help!!

    A Styrofoam bucket of negligible mass contains 1.60 kg of water and 0.425 kg of ice. More ice, from a refrigerator at -14.8 degree C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket

    asked on April 16, 2012
  71. chemistry

    A certain liquid has vapor pressures of 50 Torr. 1 mol of an involatile solute is dissolved in 1 mol of this liquid. What is the vapor pressure of the liquid above this solution?

    asked on March 19, 2012
  72. analytic geometry

    fin the center ,principal axis vertices, sketch the graph of 4x^-y^2 +56 x +2y+195=0

    asked on February 9, 2012
  73. statistics

    A manager states that in his factory, the mean number of days per year missed by his employees is less than the national mean of 10. The following data is days missed by some of his employees last year (mean=5.025, standard deviation=3.634). Is there

    asked on October 1, 2011
  74. Math 111

    This is a question that deals specifically with WebWork. Here is the question: Write the set of points from -2 to 4 but excluding -1 and 4 as a union of intervals my solution to this would be: [-2,4]U(-1,4) my reasoning: The first set includes -2 and goes

    asked on September 29, 2011
  75. Enviromental Science

    It is true that ______ a) few plants grow well around water b) plants are better able to seek water than are animals c) water covers about 95% of the plants d) the amount of water in the enivronment limits the kinds of organisms that can live there e)

    asked on May 31, 2011
  76. science

    if a force of 50 N stretches a spring 250 mm, what is the spring constant?

    asked on February 10, 2011
  77. english

    use yellow flower in a sentence

    asked on January 17, 2011
  78. Physics-Please help with formula

    If you were in a rotor style ride and the riders accelerate until the speed of ride is reached- if the radius of the cylinder is 5.0m and the coefficient of friction between clothes and wall is 0.5, how do you find minimum speed you would need to stick to

    asked on December 7, 2010
  79. English

    Why did Shakespeare intent hamlet to have an oedipal complex? I am thinking because to make the character interesting? :S

    asked on November 5, 2010
  80. chemistry

    Your body deals with excess nitrogen by excreting it in the form of urea, NH2CONH2. The reaction producing it is the combination of arginine (C6H14N4O2) with water to give urea and ornithine (C5H12N2O2). C6H14N4O2 + H2O  NH2CONH2 + C5H12N2O2 [Molar

    asked on October 7, 2010
  81. physics

    Two cars both start from rest and have the same constant acceleration. When radar is used to measure the velocity of each car, car A is found to be moving twice as fast as car B. At the instant the radar is used, car A has a displacement that is ______

    asked on September 13, 2010
  82. chemistry

    how many grams of NaOH must be added to 0.250 litres of water to form a solution of PH=10.0?

    asked on September 7, 2010
  83. biology

    In sheep, the allele for white wool (A) is dominant over the allele for black wool (a). How would you determine the genotype of a white ram, or male sheep?

    asked on February 27, 2010
  84. Psychology

    How can BATNA assist clients in human services?

    asked on July 14, 2009
  85. johnglenn

    Discuss some of the advantages to having a cycle that partially replenishes itself. In the Calvin cycle, what would happen to the cycle if there was no carbon dioxide available

    asked on April 23, 2009
  86. psychology

    discuss the role of fathers in childhood development? i've read the section and it does not really mention about the father, but mostly the motehr.

    asked on March 31, 2009
  87. statistics

    Determine the sample size required to estimate a population proportion to within 0.032 with 95.7% confidence, assuming that you have no knowledge of the approximate value of the sample proportion. Sample Size = B. Repeat part the previous problem, but now

    asked on March 28, 2009
  88. Math

    how would you solve this problem? Adult tickets to a play cost $12 and children's tickets cost $5. If 220 tickets were sold and $2542 was collected, how many of each kind of ticket was sold? There are 500 seats in the theater and 280 seats are already

    asked on October 26, 2008
  89. math

    3 coins are flipped, find the probabilities of: a) P(two heads) b) P(at most two heads) c) P(no heads)

    asked on October 23, 2008
  90. algebra problem

    If you have the sume of squares of the digits of a positive two-digit number is 20, the tens digit is 2 more than the units digit. answer is 2^2 and 4^2 (?)

    asked on April 18, 2008
  91. Science

    A drop of ink is in a tube.A stopper is used.What will happen to the drop of ink in the tube when you place your hands around the flask for 5 minutes? Is water in the tube? And what's the stopper used for? If so, heat is transferred from the hand to the

    asked on August 8, 2007
  92. Earning capacity

    How can we estimated the future earning capacity of an enterprise? Crystal Ball? The key here is estimate. Anyone can estimate. Past performance indicates many future trends. Changing markets indicated changes also. But in reality, these are estimates

    asked on January 21, 2007
  93. Econ(again)

    When state-owned enterprises are sold, how should their values be established? Should the value be based on the cost of the assets in place, the past earning power of the enterprise, or the future earning potential in a competitive economy? The value

    asked on January 21, 2007
  94. Employment

    What effect will the privatization of currently state-run enterprises have on the employment levels in those enterprises in the short run? and in the long run? In the short run, employment will drop as the enterprise will have to reduce operating costs to

    asked on January 21, 2007
  95. Math

    A sports club found that 100 of its members played at least one of football, tennis or badminton. Thirty-nine played football, 31 played tennis and 51 played badminton. Of these, 9 played both football and tennis, 8 played both tennis and badminton and 10

    asked on April 29, 2020
  96. chemistry

    How much heat is needed to convert 840. g of ice at -20°C to steam at 134°C?

    asked on December 17, 2019
  97. chemistry

    What is the final temperature when 1.16 kJ of energy is added to 11.0 g ice at 0°C? Assuming the specific heat of ice is 2.03 J/g * C.

    asked on December 5, 2019
  98. physics

    It is observed that rider A closes the 48 gap in a time of 6 seconds (a=ft/s^2). a) What speed was rider A moving while located 48 feet behind rider B? b) As timed from when rider A was 48 feet behind rider B, how many seconds elapse before rider A matches

    asked on November 10, 2019
  99. world history

    i just need help with one question i want to make sure if i am correct or should i change my answer? during the ice age,people migrated from asia across what is now bering strait to ? a.east africa b.west africa c.europe d.the americas i think its c or d i

    asked on October 7, 2019
  100. Math

    What is 80-40+4 x 3^2

    asked on August 26, 2019


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