Popular questions and responses by tom
  1. 3rd grader needs help with grammar

    Is it..... my Classmates and me or my classmates and I

    asked on May 6, 2009
  2. 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
  3. 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
  4. 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
  5. Physics

    A model rocket has a mass of 0.435 kg. It is mounted vertically and launches directly up with a thrust force of 13.1 N. a) What is the weight of the rocket? b) Determine the net force on the rocket as it is launched. c) What is the acceleration of the

    asked on December 15, 2016
  6. math

    find the value of k such that the equation e^(2x)=krootx has exactly one solution.

    asked on April 4, 2013
  7. 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
  8. Chemistry

    What is the trend in atomic size in the series of Group IIA elements Be through Ra?

    asked on November 14, 2011
  9. 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
  10. 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
  11. 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
  12. Math

    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 −0.6 Suppose that the height of the candle after 19 hours is 9.6 centimeters. What

    asked on September 8, 2015
  13. 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
  14. 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
  15. math

    Does the series converge or diverge? If it converges, what is the sum? Show your work. ∑∞n=1−4(−12)n−1

    asked on May 2, 2019
  16. 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
  17. Physics

    In an experiment conducted using the Young's double-slit apparatus, the separation between the slits is 20 µm. A first-order constructive interference fringe appears at an angle of 2.5o from the zeroth order (central) fringe. A. What wavelength of light

    asked on October 25, 2017
  18. 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
  19. 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
  20. 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
  21. computer code

    Design a pseudocode for a program that accepts an ice cream flavor the price per gallon and number of gallons sold a year, display a message this flavor is the best seller having more than 40000 gallons a year sold

    asked on September 15, 2017
  22. 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
  23. Statistics

    Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x))

    asked on May 26, 2013
  24. 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
  25. physics

    Two slits are 0.158 mm apart. A mixture of red light ( wavelength = 65 nm) and yellow green light (wavelength = 565 nm)falls on the slits. A flat observation screen is located 2.24 m away. What's the distance on the screen between the third order red

    asked on January 7, 2018
  26. Physics

    A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71¡ã W] and the second stone moves away at a velocity of 1.25 m/s [N44¡ã E], what was the

    asked on March 30, 2016
  27. 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
  28. 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
  29. 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
  30. Organic Chemistry

    The following reaction would produce a(n) __________. R-OH + R'COOH →

    asked on May 3, 2010
  31. 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
  32. 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
  33. 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
  34. statistics

    Forty-four percent of customers who visit a department store make a purchase. The probability, rounded to four decimal places, that in a random sample of 9 customers who will visit this department store, exactly 6 will make a purchase is:

    asked on October 27, 2013
  35. 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
  36. geometry

    The diagonals of rhombus FGHJ intersect at point K. If side GH is equal to 3x - 10 and side JH is equal to 6x - 19, find x.

    asked on July 14, 2011
  37. Social Studies

    What was the purpose of Hammurabi's Code

    asked on December 13, 2009
  38. Algebra

    The ratio of the length to the width of a golden rectangle is (1 + √(5):2:.The dimensions of a garden form a golden rectangle. The width of the garden is 12 feet. Find the length L of the garden. Round your answer to the nearest foot.

    asked on May 24, 2018
  39. physics

    Muscles are attached to bones by means of tendons. The maximum force that a muscle can exert is directly proportional to its cross-sectional area A at the widest point. We can express this relationship mathematically as F~max= σA, where σ (sigma) is a

    asked on March 6, 2016
  40. 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
  41. Physics

    How many joules of energy per kilogram of rest mass are needed to bring a spacecraft from rest to a speed of 0.77c?

    asked on September 14, 2014
  42. physics

    A mass m at the end of a spring vibrates with a frequency of 0.87 Hz. When an additional 602 g mass is added to m, the frequency is 0.59 Hz. What is the value of m?

    asked on March 7, 2012
  43. pre-calculus

    Graph each complex number. Then express it in rectangular form. 2(cos(4pi/3) + isin(4pi/3)) I don't understand where to go from here.

    asked on March 9, 2010
  44. Accounting

    North Pole Cruise Lines issued preferred stock many years ago. It carries a fixed dividend of $6 per share. With the passage of time, yields have soared from the original 6 percent to 14 percent (yield is the same as required rate of return). A. What was

    asked on January 10, 2010
  45. chemistry

    A chemist wishes to determine the concentration of CrO4-2 ions electrochemically. A cell is constructed consisting of saturated calomel electrode (SCE) and a silver wire coated with Ag2CrO4. The SCE is composed of mercury in contact with a saturated

    asked on May 27, 2008
  46. physics

    Two small loudspeakers emit sound waves of the same amplitude and frequency in phase with each other. The waves produce an interference pattern such that the distance from the right bisector to a point P on the third nodal line is x3. The wavelength of the

    asked on January 7, 2018
  47. Chemistry

    A 8.5 L sample is collected at 45 degrees C. What will the volume be if the temperature is raised to 70 degrees C.

    asked on August 19, 2014
  48. calculus help

    Does the function satisfy the hypotheses of the Mean Value Theorem on the given interval? f(x)= ln(x) , [1,6] If it satisfies the hypotheses, find all numbers c that satisfy the conclusion of the Mean Value Theorem. (Enter your answers as a comma-separated

    asked on April 16, 2014
  49. Physics

    What is the maximum theoretical efficiency of a steam engine operating between 60°C and 410°C?

    asked on June 27, 2012
  50. Math

    Simultaneous equation and surds 5x-3y=41 (7route2)x+(4route2)y=82

    asked on October 2, 2010
  51. 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
  52. statistics

    A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the population standard deviation is 250. a) What sample size should be used. b) Repeat part (a) with a standard deviation of 50. c) Repeat

    asked on March 13, 2010
  53. spelling

    how do you make a spelling triangle

    asked on August 31, 2011
  54. what is the difference

    what is the difference between 14kt gold and 14k gold and what one is the better gold Both are the same thing Thank you for using the Jiskha Homework Help Forum. In addition to the answer you already have, look what might happen if you don't distinguish

    asked on February 26, 2007
  55. math

    You are given 5 to 4 odds against tossing three heads with three​ coins, meaning you win ​$5 if you succeed and you lose ​$4 if you fail. Find the expected value​ (to you) of the game. Would you expect to win or lose money in 1​ game? In 100​

    asked on December 11, 2019
  56. Algebra

    Write an absolute value inequality to fit the graph below: There is a Number line with 14 on the left and 26 on the right with solid dots on both.

    asked on June 1, 2017
  57. English

    A similie , metaphor (etc) for relief??

    asked on March 31, 2017
  58. 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
  59. 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
  60. 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
  61. Math

    The first two terms in a geometric series is 12. The sum of the first three terms of the same series is 62. Determine the first four terms of the series.

    asked on January 8, 2014
  62. Physics

    A crowbar is 4.000 metres long and has its pivot 50.000 centimetres from one end. A force of 2000.000 newtons is applied to the end closest to the pivot. What effort must be applied to the other end of the crowbar to keep it in equilibrium? (Round to 3

    asked on November 1, 2013
  63. 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
  64. Physics

    A charged particle is projected into a uniform B-field. Its velocity vector is perpendicular to the B-field vector. What type of path will the particle travel? Neglect gravity. Answer straight line motion elliptical motion parabolic motion circular motion

    asked on July 16, 2013
  65. 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
  66. statistics

    Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x))

    asked on May 26, 2013
  67. physics

    the coefficients of static and kinetic friction for stone on wood are, respectively, 0.5 and 0.4. if a 150 kg stone statue is pushed with just enough force to start moving across a wooden floor and the same force continues to act afterward. find the

    asked on November 7, 2012
  68. physics

    For a glass lens submerged in water (n=1.33), the critical angle of incidence at which total internal reflection begins to happen is 60.1 degrees. What is the index of refraction of the glass?

    asked on November 2, 2012
  69. Algebra 2

    Abelardo wants to create several different 7-character screen names. He wants to use arrangements of the first 3 letters of his first name(abe, followed by arrangements of 4 digits in 1984, the year of his birth. How many different screen names can he

    asked on April 16, 2012
  70. 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
  71. Stats

    Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

    asked on March 2, 2012
  72. Maths

    Calculate speed give your answers in km/p hour Distance = 18 KM Time = 12 minutes S - T

    asked on November 6, 2011
  73. statistics

    The average score on a standardized test is 500 points with a standard deviation of 50 points. What is the probability that a student scores between 450 and 600 on the standardized test?

    asked on July 21, 2011
  74. chemistry

    . Given the following stocks 4M NaCl, 3M NaOH, 5M HCl (a) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M (b) Prepare 300ml of a solution containing 0.5M NaCl (c) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M HCl

    asked on April 15, 2011
  75. physics

    A rifle that shoots bullets at 460 m/s is to be aimed at a target 47.0 m away. If the center of the target is level with the rifle, how high above the target must the rifle barrel be pointed so that the bullet hits dead center? (Neglect air resistance.)

    asked on November 3, 2010
  76. physics

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

    asked on October 9, 2009
  77. Math

    The perimeter of a rectangle is 90 units the base is 3z and the side is 4z+3 what is the length

    asked on November 27, 2019
  78. 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
  79. chem

    The noble has configuration for Ta is [Xe] 6s2 4f14 5d3 does the order in which i arrange the principle energy levels matter when i write the configuration? Like should it be [Xe] 5d3 6s2 4f14

    asked on November 10, 2016
  80. Computer Science

    Write a program that Will prompt a user to enter his/her name and number.use a while loop that will display the user name times the entered number

    asked on October 27, 2016
  81. honors chem

    naturally occurring boron is 80.20% boron 11 (atomic mass= 11.01amu) and 19.80% of some other isoptopic form of boron. what must the atmoci mass be be in order to account for the 10.81 amu averafe atomic mass of boron? round to two decimal places i got

    asked on October 17, 2016
  82. computer science

    QUESTION 1 When using the OR logical operator to connect 2 conditions to create a complex Boolean expression, neither the first condition nor the second condition has to be true for the complex Boolean expression to be true. True False QUESTION 2 String

    asked on June 18, 2016
  83. economics

    Part 1 A firm has the current liabilities and equity financing on its balance sheet. The firm has taxable income that puts it in a 38% federal tax bracket, and the state in which it operates levies a 6.5% income tax. Compute the firm’s weighted average

    asked on April 25, 2016
  84. PHYSICS!!

    Two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left. after collision player a is travelling at 1.0 m/s to the right. a. what is the change in

    asked on April 10, 2016
  85. 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
  86. 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
  87. Math

    A monopoly has a total cost function C = 1000 + 108x + 12x^2 for its product, which has demand function p = 324 − 3x − 2x^2. Find the consumer's surplus at the point where the monopoly has maximum profit. (Round your answer to the nearest cent.)

    asked on April 22, 2015
  88. 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
  89. pacific rim

    Mrs Garcia had 2/3 of a pumpkin pie left.Her sons at 3/8 of what was left. What fraction of the whole pie did her sons eat? 2/3*3/8=6/24

    asked on January 7, 2015
  90. Physics

    A box of mass 1.50 kg is given an initial velocity of 12.5 m/s up an inclined ramp that makes an angle of 25.0o with the ground, which is horizontal. The coefficient of kinetic friction between the box and the ramp is 0.240. How long does the box slide up

    asked on May 13, 2014
  91. English/Mythology

    What is ironic about the death of Jason and Theseus from Greek mythology

    asked on May 4, 2014
  92. 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
  93. biology

    draw a diagram that shows the chromosome combinations that are possible in the haploid gametes of an organism with a diploid number of 6

    asked on January 15, 2014
  94. math

    What is the value of t in the solution to this systems of linear equations? 2s – 3t = –1 3s – 4t = 0 a)–5 b)3 c)-7/3 d)4

    asked on April 2, 2013
  95. math

    A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions W inches by L inches by cutting out equal squares of side x at each corner and then folding up the sides. (W = 12 in. and L = 20 in). Find the values of x for

    asked on February 9, 2013
  96. math


    asked on January 28, 2013
  97. Physics

    Suppose you have a very long straw that can reach from a cup of water on the ground level to the top of a very tall building. When you use a pump to suck on the straw in order to bring water up, a. you can bring the water up to any height with no problem.

    asked on January 18, 2013
  98. Algebra

    help me solve this equation by substitution. y^2− 4x^2 = 7 9y^2+16x^2 = 323

    asked on November 9, 2012
  99. pennfoster

    Which of the following sentences contains a verb in the simple past tense? A. I was working overtime for about six months. B. She would like to join us. C. We helped Joan to pack her things. D. Jenna has driven this route multiple times

    asked on February 15, 2012
  100. Chemistry

    a real gas would behave most like an ideal gas under conditions of

    asked on November 18, 2011


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