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  1. Calculus

    A box with a square base and open top must have a volume of 4,000 cm3. Find the dimensions of the box that minimize the amount of material used.

  2. chemistry

    Am I correct? Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars everyday. Although the actual process also requires water, a simplified equation (with rust shown as iron(III) oxide (Fe2O3) is:

  3. Chemistry

    Which of the following reactions will result in a reduced total pressure? a. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) c. 2HI(g) → H2(g) + I2(g) b. 2N2O(g) → 2N2(g) + O2(g) d. 2H2(g) + O2(g) → 2H2O()

  5. Physics

    Six dogs pull a two-person sled with a total mass of 280 kg. The coefficient of kinetic friction between the sled and the snow is 0.080. The sled accelerates at 0.65 m/s2 until it reaches a cruising speed of 15 km/h. What is the team's maximum power output

  6. physics class-Help!!!

    A 3.0 m rod is pivoted about its left end.A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 is applied at the end of the rod 3.0 m from the pivot. The 5.2 N is at an angle of

  7. Calculus

    A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. An industrial tank of this shape must have a volume of 1600 cubic feet. The hemispherical ends cost twice as much per square foot of surface area as the sides. Find

  8. Chemistry: Electron Configurations

    Write the electron configuration for the following ion. V3+ I got 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. In simplified form, I got [Ar]4s^2. I checked my answer against the answer given in the back of my chemistry textbook, and the two didn't correspond. The

  10. Language Arts

    1. Hydr- means “water” in Greek. what is the most likely meaning of hydrotherapy?(1 point) A. a scientific compound containing water B. a large pool of water C. a source of water D. a type of therapy that uses water******* 2. The crowd was large, so

  11. Physics

    An green hoop with mass mh = 2.4 kg and radius Rh = 0.14 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.2 kg and radius Rd = 0.1 m. The other end of the string is attached to a massless axel through the center of an orange

  12. Physics

    M, a solid cylinder (M=2.35 kg, R=0.111 m) pivots on a thin, fixed, frictionless bearing. A string wrapped around the cylinder pulls downward with a force F which equals the weight of a 0.750 kg mass, i.e., F = 7.357 N. 1)Calculate the angular acceleration

  13. chemistry

    Enter the net ionic equation for the reaction of aqueous sodium chloride with aqueous silver nitrate

  15. chemistry

    How many grams of sucrose,C12H22O11 must be dissolved in 750.mL of water to prepare a 0.250 molal solution?

  16. Physics

    A ventilation fan has blades 0.25 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade?

  17. Physics

    A woman who weighs 500N stands on an 8.0-m-long board that weighs 100N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing?

  18. 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

  20. Chemistry

    Enter the balanced complete ionic equation for HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+KCl(aq) Would it be: 2H+(aq) + 2Cl^-(aq) + 2K^+(aq) + CO3^2-(aq) => H2O(l) + CO2(g) + 2KCl(aq)? Thanks

  21. physics

    An air-track cart with mass m=0.20kg and speed v0=1.5m/s approaches two other carts that are at rest and have masses 2m and 3m, as indicated in (Figure 1) . The carts have bumpers that make all the collisions elastic. Find the final speed of cart 1,

  22. math

    Let L1 be the line passing through the points Q1=(4, −1, −2) and Q2=(1, 0, −1) and let L2 be the line passing through the point P1=(−6, 21, −8) with direction vector →d=[−3, 9, −3]T. Determine whether L1 and L2 intersect. If so, find the

  23. Chemistry

    A solution contains 10.0 g pentane, C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane? I figured the equation would be: ___ M Hexane x 10 Divided by 30 =Mole fraction of Hexane?

  25. chemistry

    calculate the hydronium ion concentration in an aqueous solution that contains 2.50x10^-6M in hydroxide solution

  26. Chemistry

    Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NOREACTION. Are my answers below correct? I used the textbook 1. sodium chloride and lead (II) acetate

  27. linear algebra

    Find all values of x so that the triangle with vertices A=(−3, 1, x), B=(−3, 4, −2), and C=(−2, −2, 2) has a right angle at A.

  28. Chemistry

    A sample of Chlorine occupies 8.50 L at 80.0 C and 740 mm Hg. What volume will Chlorine occupy at STP?

  30. SS

    Which of the following responsibilities are held by the federal government? Choose all that apply. (2 points) protecting national parks administering healthcare providing Social Security managing intercity traffic creating garbage collection services

  31. Spanish--1 question

    Why is it not always necessary to include a subject pronoun before the verb in Spanish?

  32. calculus

    A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume that no clay is lost in the process. Suppose the height of the cylinder is increasing by 0.5

  33. Chemistry

    What is the total volume of gases produced at 819 K and 1. atm pressure when 320 g of ammonium nitrite undergoes the following decomposition reaction? NH4NO2 --------> N2(g) + 2H2O(g)

  35. Physics

    A uniform meter stick balances on a fulcrum placed at the 40 cm mark when a weight W is placed at 30 cm mark. What is the weight of the meter stick? How to calculator it ?

  36. Chem

    Consider the balanced chemical equation: 3Sr(OH)2(aq) + 2H3PO4(aq) → Sr3(PO4)2(s) + 6H2O(l). How many moles of Sr(OH)2 remain if 0.10 mol of H3PO4 react with 0.40 mol of Sr(OH)2?

  37. Chemistry

    Electron Configuration for mo2+

  38. physics

    To test out your new foam dart blaster, you hang a small cube, size 5cm on a side with mass 0.5 kg, from your ceiling. You then fire a 41.9 gram foam dart at the bottom of it with a speed of 18 m/s, and the dart sticks to the cube. Calculate the height in

  40. Math

    (The table shows the number of tulips and roses that two florists sold last month. Use the table to write the specified ratio for questions 2 and 3.) _____________ ______________|Tulips | Roses| | Flora's Flowers | 56 | 81 | | Pat's Petals: | 31 | 76 |

  41. Chemistry

    13.A student mixed 5.00 g (0.0594 mol) of solid cyclohexane, C6H12, (84.18 g mol–1) at its melting temperature of 6.6°C with 50.0 g (0.594 mol) of liquid cyclohexane at 50.0°C in an open yet insulated container. After thermal equilibrium was

  42. Math

    A rectangular garden in a backyard has an area of (3x^2+5x-6) square meters. It's width is (x+2) meters A. Find the length of the garden B. You decided to partition the garden into two or more smaller congruent gardens.Design a possible model and include

  43. Science Check Answer

    1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted

  45. Math

    Which of the following are necessary to describe a rotation of a figure on a coordinate plane ? A.the center of rotation B.the shape of the figure C.the number on of degrees of the rotation D.the direction of the rotation Is the answers A and C? thank you

  46. HEALTH AND P.E ONE QUESTION HELP!!!!!!!!!!

    which of the following is not a cause of mental or emotional illness A.) Physical factors B.) heriditiy C.) Values D.) early experiences

  47. Art

    In the painting a seated soldier by Hippolyte Bellange the artist recognized the basic shapes in the figure on order to A. confuse the eye, making it difficult to draw. B. Record the various parts of the body accurately. C. Create a change in value D.

  48. precalculus

    Outside temperature over a day can be modelled as a sinusoidal function. Suppose you know the temperature is 80 degrees at midnight and the high and low temperature during the day are 90 and 70 degrees, respectively. Assuming t is the number of hours since

  50. Physics

    If the coefficient of kinetic friction between a 35 kg crate and the floor is 0.30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if μk is zero?

  51. algebra

    Which set represents a Pythagorean triple? 27, 38, 42 33, 44, 55 35, 38, 42 68, 72, 81 Which number completes the Pythagorean triple: 12, 16, ____? 18 20 22 24 A base ball diamond is square. The distance from home plate to first base is 90 feet. In feet,

  52. Physics

    An 8.00 g bullet is fired into a 250 g block that is initially at rest at the edge of a table of 1.00 m height (Fig. P6.26). The bullet remains in the block, and after the impact the block lands 2.00 m from the bottom of the table. Determine the initial

  53. Chemistry Suspension Examples...

    I need 10 examples of household suspensions for science class tomorrow. I got 10 solutions, 10 colloids, and 10 solvents...but can't figure out 10 suspensions! Help! http://www.elmhurst.edu/~chm/vchembook/106Amixture.html Suspensions have much larger

  55. mathematics

    Find x so that the triangle with vertices A=(4, 4, −2), B=(2, −1, −5), and C=(x, 14, −6) has a right angle at A.

  56. Language Arts

    including which fact would best help nominate jackie robinson for the most courageous category in a yearbook My answer was C. “Jackie was forced to leave the university of California for financial reasons”

  57. Calc 3

    Given the matrix A= a 6 5 a -8 8 7 9 a find all values of a that make |A|=0. Give your answer as a comma-separated list.

  58. social studies

    Which was one of the roles of farmers in ancient Egypt? A. help the pharaoh govern Egypt B. keep records for the bureaucracy C. work as laborers on the pharaoh's building projects D. instruct the slaves in religion

  60. Chemistry

    A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 338.mg of oxalic acid H2C2O4 , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250.mL of distilled water. The

  61. linear algebra

    Let T be the plane 2x−3y = −2. Find the shortest distance d from the point P0=(−1, −2, 1) to T, and the point Q in T that is closest to P0. Use the square root symbol '√' where needed to give an exact value for your answer. I need help with this

  62. Spanish

    Where was the first Latin American winner of the Nobel Prize for Literature born? Argentina*** Chile Honduras Puerto Rico

  63. world histoy

    what civilization predated classical Greece and the development on the island of Crete

  65. math

    1. Find the length of the hypotenuse of a right triangle with legs of 9 cm and 12 cm A. 8 cm B. 21 cm C. 15 cm D. 225 cm the length of the hypotenuse of a right triangle with legs of 13 cm the length of one leg is 5 cm find the length of the other leg A.

  66. Physics 1

    A 1400 kg car traveling at a speed of 34 m/s skids to a halt on wet concrete where μk = 0.50. How long are the skid marks?

  67. Health

    I just need this question checked. According to the Dietary Guidelines for Americans, which of the following is most important in order to maintain a healthy weight? 1. Get all the nutrients your body needs. 2. Balance calories eaten with activity

  68. Chem

    Separate the following balanced chemical equation into its total ionic equation. AgNO3​(aq)+NaCl(aq) --> NaNO3​(aq)+AgCl(s) (List the ions in order of the above equation.) Write the net ionic equation for the reaction above. (Make sure the cation is

  70. PE

    a(n) _______ is a substance that helps in the chemical digestion of food A epiglottis B Enzyme C Gallbladder D peristalsis

  71. SS

    How is the number of Electoral College seats per state determined? (1 point) by the number of party delegates assigned to the state by the total number of House and Senate representatives by the traditional number assigned under the 12th Amendment by

  72. math

    In an interbarangay basketball league the team from barangay Culiat has won 12 out of 25 games a winning percentage of 48% .We have seen that they need to win 8 games consecutively to raise their percentage to at least 60%. What will be their winning

  73. Comm Tech

    1.)what did STRICT study generally find about the effect of internet use on sleep

  75. Chemistry

    A 10.0g sample of H2O(l) at 23.0degrees C absorbs 209 joules of heat. What is the final temp of the H2O(l) sample?

  76. Art

    Bourgeois by Alfred Jacob Miller Look at the following illustration of an early american settler. it would likely inspire a writer to create a story based on all of the following historic information except A) the clothing worn by the individuals B) the

  77. Math

    In water refilling station, the time that a pipe takes to fill a tank is 10 minutes more than the time that another pipe takes to fill the same tank. If the two pipes are opened at the same time, they can fill the tank in 12 minutes. How many minutes does

  78. Physics II

    A large cylindrical water tank 11.5 m in diameter and 13.5 m tall is supported 8.75 m above the ground by a stand. The water level in the tank is 10.6 m deep. The density of the water in the tank is 1.00 g/cm3. A very small hole is formed at the base of

  80. math

    Sean has 8-inch pieces of toy train track and Ruth has 18-inches of train track. How many of each piece would each child need to build tracks that are equal in length?

  81. math

    to graph C(3,2) on a coordinate plane Translate the point left 3 units and down 1 unit.Graph the image point C. A. x,2,y3=x,1,y,1 B. x,2,y2=x,1,y,1 C. x,2,y3=x,1,y,1 D. x,3,y2=x,1,y,1 Is the answer D? Thank you

  82. Calculus

    The radius of a circle is increasing. At a certain instant, the rate of increase in the area of the circle is numerically equal to twice the rate of increase in its circumference. What is the radius of the circle at that instant? A. 1/2 B. 1 C. Sqrt 2 D. 2

  83. math Help!!!!!!

    If Nicholas is located at (-3,2), what is the distance to get to the grocery store? Grocery store is at quadrant 4 and is on 1,-1 A. 2 B. 3 C. 4 D. 5 Is the answer B?

  85. Math

    1.)which two sq roots are used to estimate 5? a.)1 & 2 b.)2 & 4 ****** c.)4 & 9 d.)9 & 16 2.)which two sq roots are used to estimate 43? a.)25 & 36 b.)36 & 49***** c.)49 & 64 d.)25 & 64 3.)an estimate for the sq root of -66 is? a.)-6 b.)-7 c.)-8***** d.)-9

  86. Physics

    A 50 g ball of clay traveling at speed v0 hits and sticks to a 1.0 kg block sitting at rest on a frictionless surface. A) What is the speed of the block after the collision? B) What percentage of the ball's initial energy is "lost"?

  87. Calculus Help Please Urgent!!!

    A piece of wire 14 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. (a) How much wire should be used for the square in order to maximize the total area? 14 m this one I got right (b) How

  88. Chemistry

    For the following chemical reaction... HCN (aq) + KOH (aq)----> H2O (l) + KCN (aq) write the net ionic equation, including the phases

  90. Msth

    solve each inequality. 1. m – 7 < 6 (1 point) m < –1 m > 1 m < 13 m < –13 2. y + 5 ≥ 7 (1 point) y ≤ 2 y ≤ 12 y ≥ 2 y ≥ 12 3. p + 12 > 9 (1 point) p > 21 p > 3 p > –21 p > –3 4. Translate the following statement into an inequality: Five

  91. Math

    A cone is constructed by cutting a sector from a circular sheet of metal with radius 20cm. The cut sheet is then folded up and welded. Find the radius and height of the cone with the maximum volume that can be formed in this way.

  92. calculus

    A sample of a radioactive substance decayed to 94.5% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? (b) How long would it take the sample to decay to 65% of its original amount?

  93. Chemistry

    NaI(aq)+Hg2(C2H3O2)2(aq)--> Express your answer as a chemical equation. Enter NOREACTION if no reaction occurs. Identify all of the phases in your answer. I need help! Someone please help..

  95. Trig

    A cylindrical tank, 6 foot in radius, lies on it's side parallel and against the side of a warehouse. A ladder leans against the building, passes over and just touches the tank, and has a slope of -3/4. Find the equation of the ladder and the length of the

  96. Algebra (Please check)

    PLEASE CHECK MY ANSWERS (: I just want to make sure I am doing this correctly __________________________________ Graph the system of constraints and find the value of x and y that maximize the objective function. Constraints: x ≥ 0 y ≥ 0 y ≤ (1)/(5)

  97. physics

    Find the net torque on the wheel in the figure below about the axle through O perpendicular to the page, taking a = 11.0 cm and b = 23.0 cm. (Indicate the direction with the sign of your answer. Assume that the positive direction is counterclockwise.)

  98. CHEM

    At constant pressure, which of these systems do work on the surroundings? Check all that apply. 2A (g) + B(s) --> 3C(g) 2A (g) +2B (g) -->5C(g) A(g)+ B(g) --> C(g) A (s) +2B(g)--> C(g)

  100. chemistry

    A sample of O2 gas is collected over water at 23C at a barometric pressure of 751 mmHg (vapor pressure of water at 23C is 21 mmHg). The partial pressure of O2 gas in the sample collected is: (a) 21 mmHg (b) 751 mm Hg (c) 0.96 atm; or (d) 1.02 atm The

  101. Physics

    A rock is projected from the edge of the top of a building with an initial velocity of 19.6 m/s at an angle of 31 degrees above the horizontal. The rock strikes the ground a horizontal distance of 77 m from the base of the building. The acceleration of

  102. Calculus

    A rancher plans to make four identical and adjacent rectangular pens against a barn, each with an area of 100m^2. what are the dimensions of each pen that minimize the amount of fence that must be used?

  103. Calculus

    What is the linearization of f(x)=e^x at x=1?

  105. Chemistry

    If 3.21 mol of a gas occupies 56.2L at 44C and a pressure of 793 torr, what volume will 5.29 mol of this gas occupy under the same conditions? (A) 61.7 L (B) 30.9 L (C) 14.7 L (D) 92.6 L (E) 478 L

  106. Physical Education

    The smooth and effective working together of your muscles and bones is what? Some call it muscle tone.

  107. language arts

    Which reference source will give the pronunciation, origin, and definitions of a word?

  108. Mathematics

    If a figure shows a cylindrical casting of height 8cm and external and internal diameters 9cm and 5cm respectively. Calculate the volume of metal in the casting

  110. Math

    A rectangle has a perimeter of 12 x +8y. If one side of the rectangle is 4x-2y. write and expression of the other side. 2(2x +y) is this right

  111. math

    On what day in 1929 was the year 200 000 minutes old

  112. Georgia History

    What was the name of the agreement between small and large states that provided proportional representation by population in the lower house and equal representation by state in the Senate?

  113. Algebra

    Simplify the rational expression. State any restrictions on the variable. t^2+4t-12/t^2-4

  115. math

    Translate the phrase "nine more than two times a number" into an algebraic expression

  116. Texas History

    16. Compare the Constitution of 1824 with the U.S. Constitution in terms of individual rights, religion, power of the president, and the right to possess a firearms. (4 points) Please help fast!! 😵

  117. Physics

    If a person weighs 818 N on earth and 5320 N on the surface of a nearby planet, what is the acceleration due to gravity on that planet? A. 55.4 m/s^2 B. 46.5 m/s^2 C. 63.7 m/s^2 D. 73.3 m/s^2 Help!!

  118. social studies

    Why did the British want to expand their control into the Ohio Valley in the mid-1700s?

  120. Science

    This picture shows the skeleton of an animal. What best describes what the living animal had? src="/content/media/913045-342013-75338-PM-1886079994.jpg" a backbone radial symmetry bilateral symmetry asymmetry

  121. ss

    1.What were supporters of the U.S. Constitution called? A. Pundits B. Constitutionalists C. Federalists D. Patriots 2.Why was Georgia so quick to ratify the Constitution? A. Georgians feared that a war with the Creek Indians was coming. B. Georgian

  122. math

    Edith wants to cut pieces of ribbon 1/3 meter long from a piece of 5/6 meter.how many pieces can be cut?

  123. Math

    1. Classify the triangle according to side length and angle measurement 2. Classify the triangle according to side length and angle 3. Classify the triangle with side lengths 4,4, and 4 4. Classify the triangle with the measuring 69,42, and 68, 5.

  125. Math

    Solve the equation 5.8 = z/2.2