Most popular questions and responses by tom
  1. Calculus

    For f(x)=(1-x)/(1+x) and g(x)=x/(1-x) , find the simplified form for f [g(x)] and state the domain

    asked on May 27, 2015
  2. physics

    The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0 degrees above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground. (See Nature, Vol. 424,

    asked on February 8, 2016
  3. Calculus

    The table below shows the temperature (in °F) t hours after midnight in Phoenix on March 15. The table shows values of this function recorded every two hours. (10 points) a. Estimate the value of T'(6). Give units in your answer. b. What is the meaning of

    asked on May 15, 2015
  4. physics

    At the equator, the earth’s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earth’s field below horizontal, steadily increases. Green

    asked on April 14, 2011
  5. honors physics

    A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass sytem is 2.1 J. What is the elastic potential energy of the system when the 3.2 kg block is replaced by

    asked on December 1, 2010
  6. Intro Physics - Newton's third rule

    a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!

    asked on October 7, 2014
  7. Algebra 2

    A share of ABC stock was worth $60 in 2005 and only worth $45 in 2010. Find the multiplier and the percent decrease.

    asked on November 12, 2015
  8. PHYSICS!!!!

    It is 5.0 km from your home to the Physics lab and your car is out of gas. You could run that distance at 10 km/h, which uses up energy at the rate of 700 W; or you could walk it leisurely at 3.0 km/h, which uses energy at 300 W. (a) Calculate how much

    asked on April 4, 2016
  9. art

    this image was created by using basic math concepts that include all of the following except A)knowing how to create a pattern B)using understanding the angles of the shapes C) a basic understanding of different geometric shapes. D) applying appropriate

    asked on October 5, 2016
  10. statistics

    Based on data collected by the National Center for Health Statistics and made available to the public in the Sample Adult database, an estimate of the percentage of adults who have at some point in their life been told they have hypertension is 23.53

    asked on September 13, 2011
  11. Math

    Maya made a sign with area of 48 square centimeters. Use a centimeter grid paper to draw a shape that shows what her sign could look like?

    asked on May 20, 2015
  12. calculus

    An observer is 20 m above the ground floor of a large hotel atrium looking at a glass-enclosed elevator shaft that is 20 m horizontally from the observer (see figure). The angle of elevation of the elevator is the angle that the observer's line of sight

    asked on November 9, 2014
  13. Math

    For the geometric series, S4/S8 = 1/17. Determine the first three terms of the series if the first term is 3.

    asked on January 4, 2014
  14. Calculus

    The function's value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency, f " > 0 f " < 0 f ' > 0 f ' < 0

    asked on May 20, 2015
  15. Calculus

    Use the table below to evaluate d/dx [f[g(2x)]] at x = 1 x 1 2 3 4 f(x) 6 1 8 2 f '(x) 6 1 8 2 g(x) 1 4 4 3 g '(x) 9 5 5 -4

    asked on May 27, 2015
  16. physics

    In the apparatus shown in the figure (Figure 1) , m1 = 10kg and the coefficients of static and kinetic friction between m1 and the table are 0.69 and 0.32, respectively. Part A What mass of m2 will just barely set the system in motion?

    asked on October 3, 2013
  17. college chem

    a student dissolves 1.0mole of sucrose in 1000 grams of water at 1.0atm. Compared to the boiling point of pure water , the boiling point of the solution is?

    asked on September 1, 2017
  18. physics

    Question: You live at the top of a steep (a slope of ???? degrees above the horizontal) hill and must park your 2200 kg car on the street at night. a) You unwisely leave your car out of gear one night and your handbrake fails. Assuming no significant

    asked on February 29, 2016
  19. art

    Modernism focused on the distinction between “high” and “low” culture in fine art. Which of the following reacted against this distinction by incorporating images from “lowbrow” culture into works of fine art? a)Minimalism b)Pop Art c)Site

    asked on September 21, 2018
  20. Calculus

    The position function of a particle in rectilinear motion is given by s(t) s(t) = t^3 - 9t^2 + 24t + 1 for t ≥ 0. Find the position and acceleration of the particle at the instant the when the particle reverses direction. Include units in your answer.

    asked on May 18, 2015
  21. chem 2

    What is the pH of a solution that consists of 0.50M H2C6H6O6(ascorbic acid) and 0.75M NaHC6H6O6(sodium ascorbate)? for ascorbic acid, Ka=6.8x10-5

    asked on March 3, 2012
  22. Calculus

    Find the x-coordinates of any relative extrema and inflection point(s) for the function f(x) = 3x^(1/3) + 6x^(4/3). You must justify your answer using an analysis of f '(x) and f "(x). I found the first and second derivative which i think is

    asked on May 18, 2015
  23. calculus

    FInd the integral of the infinite series of (2x)^n / n^2 I got (2x)^(n+1) / 2n^2(n+1) is this right ∫ from 0 to ∞ ∑ (2x)^n / n^2

    asked on April 1, 2019
  24. Chemistry

    The piperazine content of an impure commercial material can be determined by precipitating and weighing the diacetate: (C2H4)2N2H2 + 2 CH3COOH → (C2H4)2N2H2(CH3COOH)2 In one experiment, 0.3126 gram of the sample was dissolved in 25 mL of acetone, and 1

    asked on August 23, 2014
  25. Physics HELP!

    The position of an object connected to a spring varies with time according to the expression x = (7.1 cm) sin (2.1π t). Find (a) the period of this motion (b) the frequency of the motion (c) the amplitude of the motion (d) the first time after t=0 that

    asked on November 19, 2012
  26. Physics

    A box of mass m slides down an inclined plane that makes an angle of φ with the horizontal. If the coefficient of kinetic friction is μk, find an expression for the acceleration of the box down the slope. The acceleration due to gravity is g. a. g (

    asked on September 23, 2016
  27. Math

    What is the volume of a cereal box that is 2 inches thick, 12 inches high and 10 inches wide?

    asked on April 22, 2016

    Patricia owned so many posters that she decided to sell 63 of them to her friends. After selling the posters, she still had 172 left. Write and solve an equation to find the number of posters p Patricia had originally

    asked on March 8, 2012
  29. chemistry

    Calculating Parts per million Helium gas, 3.0 x 10^-4 is dissolved in 200.0 g of water. Express this concentrartion in parts per million.

    asked on May 6, 2009
  30. chemistry

    If the density of a certain alcohol is 0.785 g/mL, what volume of the alcohol would have a mass of 75.0g?

    asked on September 2, 2011
  31. physics

    A 4.5 cm tall object is placed 20 cm in front of a spherical mirror. It is desired to produce a virtual image that is upright and 3.5 cm tall. (a) What type of mirror should be used? concave mirror convex mirror (b) Where is the image located? (Your answer

    asked on March 25, 2012
  32. physics

    a 0.30kg ball encounters a catchers hand while moving at the rate of 40m/s. the catcher draws his hand back so that the ball comes to a stop in a distance of 50cm. how strong a force did the ball exert on the catchers hand? i got 29.43N

    asked on February 19, 2019
  33. physics

    A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.58 s after leaving the dock has a magnitude of 7.1 m. What is the car's speed at the instant it drives off the edge of the dock?

    asked on September 15, 2012
  34. AP Calculus Help Five Questions

    1. Find the particular solution to y " = 2sin(x) given the general solution y = -2sin(x) + Ax + B and the initial conditions y(pi/2) = 0 and y'(pi/2) = -2. 2. What function is a solution to the differential equation y ' - y = 0? 3. If dy/dx = cos^2(pi*y/4)

    asked on March 27, 2018
  35. chemistry

    What is the bond order of OH- and OH+? I tried to solve it but couldn't so Im about to give up. Help me please.

    asked on May 24, 2008
  36. physics

    A 68.0 kg boy and his 45.0 kg sister, both wearing roller blades face each other at rest. The girl pushes the boy hard, sending him backward with a velocity 3.70 m/s toward the west. Ignore friction. How much chemical energy is converted into mechanical

    asked on September 29, 2008
  37. Math

    A ferris wheel has a radius of 20m and the bottom is 2m above the ground. The wheel makes one rev in 40 sec. If the rider gets on at 30^0 on the left of the lowest point going downwards, wirte the sine function to show this movement

    asked on December 21, 2017
  38. college physics

    A 0.384 kg puck, initially at rest on a horizon- tal, frictionless surface, is struck by a 0.189 kg puck moving initially along the x axis with a speed of 2.7 m/s. After the collision, the 0.189 kg puck has a speed of 1.7 m/s at an angle of 28 to the

    asked on October 22, 2011
  39. help me please physics

    A monatomic ideal gas expands from point A to point B along the path shown in the drawing. (a) Determine the work done by the gas. J (b) The temperature of the gas at point A is 198 K. What is its temperature at point B? K (c) How much heat has been added

    asked on December 10, 2010
  40. AP Calculus

    Find the particular solution to y ' = 2sin(x) given the general solution is y = C - 2cos(x) and the initial condition y(pi/2) = 1

    asked on March 26, 2018
  41. physics

    A trained dolphin leaps from the water with an initial speed of 12 m/s. It jumps directly towards a ball held by the trainer a horizontal distance of 5.50 m away and a vertical distance of 4.10 m above the water. In the absence of gravity the dolphin would

    asked on May 20, 2012
  42. physics

    Is it possible to calculate the torque acting on a rigid body without specifying the origin?

    asked on October 9, 2009
  43. math

    2sec^2x -3tanx =5 for [0,2pi)

    asked on December 27, 2017
  44. Physics

    A 72 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 12 m , and falls a total of 35 m . Calculate the maximum acceleration she experiences.

    asked on December 11, 2017
  45. math

    frank has 100 geese and cows on his farm. The animals have a total of 340 legs. How many geese and cows does frank have?

    asked on January 29, 2016
  46. Calculus

    Which of the following statements is/are true? I.If f '(c) = 0, then f has a local maximum or minimum at x = c. II.If f is continuous on [a, b] and differentiable on (a, b) and f '(x) = 0 on (a, b), then f is constant on [a, b]. III.The Mean Value Theorem

    asked on May 20, 2015
  47. Caclulus

    Find f'(x) for f(x) = sin3(3x2).

    asked on May 15, 2015
  48. calculus

    sum of the geometric series (2 - 3^n) / 5^n whats a and r?

    asked on March 11, 2019
  49. Math

    If the total cost function for producing x lamps is C(x) = 90 + 36x + 0.1x^2 dollars, producing how many units will result in a minimum average cost per unit? PLEASE EXPLAIN YOUR WORK Thank you

    asked on March 9, 2015
  50. chemistry help

    What ratio does molarity express?

    asked on May 18, 2009
  51. Physics

    The boom of a crane is 20 m long and is inclined 20ᵒ from the horizontal. A bucket of cement with a mass of 3000 kg is suspended from the upper end of the boom. What is the torque acting on the point where the boom is attached to the crane? A. 5.5 x 105

    asked on November 13, 2012
  52. Stats

    In the game Roulette, a ball spins on a circular wheel that is divided into 38 arcs of equal lenght, numbered 00, 0, 1, 2, ... , 35, 36. The number on the arc on which the ball stops is the outcome of one play of the game. The numbers are also colored as

    asked on July 13, 2017
  53. Chemistry

    I need help with What is the solubility of silver oxide, Ag2O, in a solution buffered at pH 10.50? The Kc for the following equilibrium is 2.0 x 10-8. Express your answer in g/L Ag2O(s) + H2O(l) ¡ê 2Ag+ (aq) + 2OH- (aq)

    asked on October 25, 2010
  54. world history

    How did the Renaissance contribute to the Age of Exploration? by emphasizing the importance of converting people to Christianity by awakening a spirit of discovery and innovation in Europe by fostering a belief in the importance of working as a group by

    asked on February 21, 2011
  55. AP BIO

    2. Suppose the DNA molecule were composed of six monomers. In addition to the monomers A, T, C and G, two other monomers, O and P, were present. Furthermore, O and P were known to pair only with each other. Which of following statements regarding this kind

    asked on March 14, 2010
  56. physics

    Model rocket engines are sized by thrust, thrust duration, and total impulse, among other characteristics. A size C5 model rocket engine has an average thrust of 5.26 N, a fuel mass of 12.7 g, and an initial mass of 25.5 g. The duration of its burn is 1.90

    asked on October 7, 2008
  57. Physics

    A 1100 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 40 cm. What is the spring constant of the spring? I don't understand what to do here

    asked on April 10, 2016
  58. physics

    The mass of the Earth is 5.98x10^24 kg, and the mass of the Moon is 7.36x 10^22 kg. The distance of separation, measured between their centers, is 3.84x10^8 m. Locate the center of mass of the Earth-Moon system as measured from the center of the Earth. I

    asked on October 3, 2008
  59. physics

    A 0.34 kg pendulum bob is attached to a string 1.2 m long. What is the change in the gravitational potential energy of the system as the bob swings from the bottom of the string, where θ = 37°? i don't know how to do this. The bottom of the string is 1.2

    asked on December 9, 2009
  60. Physics (Mirror Rays)

    3. When an object is located very far away from a convex mirror, the image of the object is 18 cm behind the mirror. Using a ray diagram drawn to scale, determine where the image is located when the object is placed 9.0 cm in front of the mirror. Note that

    asked on May 30, 2017
  61. Stats

    A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponges were (in ounces): 4.1, 3.7, 3.3, 3.5, 3.8, 3.9, 3.6,

    asked on April 29, 2012
  62. calculus

    How do I find the sum of a geometric series from 2 to infinity of -3/ (4^n) ?

    asked on March 11, 2019
  63. what is the rate of change of the angle of eleva

    An observer is 20 m above the ground floor of a large hotel atrium looking at a glass-enclosed elevator shaft that is 20 m horizontally from the observer (see figure). The angle of elevation of the elevator is the angle that the observer's line of sight

    asked on November 10, 2014
  64. Algebra

    Mrs. Rodrigues was selling two kinds of raffle tickets for $1.50 and $3.50. The number of $1.50 tickets sold was 5 more than three times the number of $3.50 tickets sold. She earned a total of $1,607.50. How many $1.50 tickets were sold?

    asked on February 17, 2016
  65. physics

    A cat walks along a uniform plank that is 4 m long and has a mass of 7 kg. The plank is supported by two sawhorses, one 0.44 m from the left end of the board and the other 1.5 m from its right end. When the cat reaches the right end, the plank just begins

    asked on May 20, 2012
  66. physics

    It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian

    asked on February 1, 2016
  67. math

    The exchange rate of U.S. dollars to British pound's is .63 you have $4000 to convert to British pounds. How many British pounds will you receive?

    asked on May 27, 2012
  68. Science

    1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength D.amplitude

    asked on May 19, 2015
  69. math

    A park ranger finds that 35% of the park visitors stay at the campground. Of 105 visitors stayed at the campground in one day, how many visitors did the park have that day? i got 36.75 people and then i rounded and got 37 people.

    asked on January 29, 2013
  70. Physics

    In a classroom demonstration, a 79.2-kg physics professor lies on a “bed of nails.” The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the

    asked on June 5, 2012
  71. Physics

    A car driving along a highway at a speed of 23 m/s strays onto the shoulder. Evenly spaced parallel grooves called “rumble strips” are carved into the pavement of the shoulder. Rolling over the rumble strips causes the car's wheels to oscillate up and

    asked on November 21, 2011
  72. physics

    A sample of ideal gas is expanded to twice its original volume of 1.00 m3 in a quasi-static process for which P = áV2, with á = 2.50 atm/m6, as shown in the figure. How much work is done by the expanding gas? i tried using the eq:

    asked on October 15, 2008
  73. Physics

    An infinitely long line charge of uniform linear charge density λ = -3.00 µC/m lies parallel to the y axis at x = -2.00 m. A point charge of 4.70 µC is located at x = 1.50 m, y = 2.50 m. Find the electric field at x = 2.50 m, y = 2.00 m. I added the

    asked on October 10, 2011
  74. physics

    A small cylinder rests on a circular turntable that is rotating clockwise at a constant speed. The cylinder is at a distance of r = 12 cm from the center of the turntable. The coefficient of static friction between the bottom of the cylinder and the

    asked on July 10, 2013
  75. physics

    Two men pushing a stalled car generate a net force of +698 N for 7.37 s. What is the final momentum of the car?

    asked on February 23, 2012
  76. chemistry

    Calculate the percent yield if 104 g of CH3CO2CH2CH3 is produced by the reaction of 111 g of CH3CO2H according to the following equation: CH3CO2H(l) + CH3CH2OH(l) ¨ CH3CO2CH2CH3(l) + H2O(l)

    asked on August 14, 2011
  77. calc

    integrate (x-2) / (x+1)^2 +4 dx

    asked on November 30, 2018
  78. Calculus

    The function's value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency, f " > 0 f " < 0 f ' > 0 f ' < 0

    asked on May 20, 2015
  79. Math

    Jerrod's bike has a tire diameter of 26 inches. How far will the bike travel in 100 rotations of its tires?

    asked on January 29, 2014
  80. Physics

    A satellite of mass 210 kg is launched from a site on Earth's equator into an orbit at 210 km above the surface of Earth. (a) Assuming a circular orbit, what is the orbital period of this satellite? (b) What is the satellite's speed in its orbit? (c) What

    asked on November 24, 2010
  81. AP BIO

    1. A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1

    asked on March 14, 2010
  82. chemistry need help

    A fellow student say , " All substance experience London disperison forces of attraction between particle." Is this etatement true? Explain your answer

    asked on April 19, 2009
  83. Algebra

    Carmen invests a total of $5200. Some of the money is invested at 8%. The rest is invested at 10%. If Carmen earned $496 of interest in one year, how much did she invest at each rate?

    asked on February 14, 2019
  84. math

    A certain number was increased 5 times, then decreased by 3, then halved. The result was 0.3 less than the original number. What was the original number?

    asked on October 23, 2016
  85. chemistry

    A 0.821 sample of a substance composed of diatomic molecules has a mass of 131.3g. Identify this molecule. May I have your expert help with this question? Thank you.

    asked on April 22, 2010
  86. Physics

    A 0.15 kg baseball is thrown towards a batter with a velocity of 40 m/s. The batter hits the ball and returns it directly back with a velocity of 60 m/s. What is the change in momentum of the ball?

    asked on November 30, 2009
  87. spelling

    how do you make a spelling triangle

    asked on August 31, 2011
  88. Chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.550. If a trial's absorbance is measured to be 0.350 and its initial concentration of SCN– was 0.0010 M, the

    asked on June 28, 2008
  89. Algebra

    A butcher has supplies of lean beef containing 15% fat, and fat trim containing 100% fat. How many kg of lean beef and fat trim are needed to make 50 kg of hamburger containing 25% fat? (round your answers to 1 decimal place.)

    asked on February 14, 2019
  90. calculus

    evaluate the improper interval with an interior discontinuity dx/x^3 from -1 to 2

    asked on January 25, 2019
  91. PHY 101

    A 0.425-kg blue bead slides on a frictionless, curved wire, starting from rest at point where h = 1.50 m. At point , the blue bead collides elastically with a 0.675-kg green bead at rest. Find the maximum height the green bead rises as it moves up the

    asked on October 6, 2012
  92. physics

    In the figure, a stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction, where they stop. Piece L, with a mass of 2.0 kg, encounters a coefficient of kinetic friction μL = 0.40 and

    asked on July 21, 2010
  93. computer programming

    Create the psuedocode for an application class named Monogram. Its main() method holds three variables that hold your first, middle, and last initials, respectively. Create a method to which you pass the three initials and that displays the initials

    asked on March 10, 2017
  94. government

    the federalist papers were written to what? win support for the constitution in new york expose the lack of civil liberties protected in the constitution urge ratification of the constitution in virginia condemn the constitution for the absence of any

    asked on May 11, 2011
  95. calculus

    Find the volume of the solid obtained by rotating the region in the first quadrant enclosed by the curves y= tanx and y=2cosx between the bounds 0 and pi/2. I need the setup.

    asked on March 4, 2019
  96. AP Calculus

    Find the area of the region bounded by the curves y = sin^-1(x/2), y = 0, and x = 2 obtained by integrating with respect to y. Please include the definite integral and the antiderivative.

    asked on March 26, 2018
  97. Chemistry

    Why is it that copper (II) sulfate with barium hydroxide --> copper hydroxide (solid) + barium sulfate (solid)? According to the solubility rules given to me by my professor, both are insoluble, and therefore should be labeled as solids. Is there something

    asked on September 8, 2016
  98. Calculus

    Which of the following functions is continuous at x = 5? I put a for my answer, could someone please check this? a. f(x)=(x^2-25)/(x+5) b. (x^2-25)/(x-5), x cannot equal 5 20 when x equals 5 c.(x^2-25)/(x-5), x cannot equal 5 0 when x equals 5 d. all of

    asked on May 21, 2015
  99. Math

    A rectangular livestock pen with THREE SIDES of fencing is to be built against the barn. The fencing is 1050ft long. Find the dimensions of the maximum area that can be enclosed. What is the maximum area?

    asked on April 23, 2013
  100. college algebra

    How much paper would you need to wrap a box 10cm wide, 25cm high, and 50cm long?

    asked on April 2, 2013


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