Popular questions and responses by Ann
  1. Physics

    A football player of mass 103 kg running with a velocity of 2.0 m/s [E] collides head-on with a 110 kg player on the opposing team travelling with a velocity of 3.2 m/s [W]. Immediately after the collision the two players move in the same direction.

    asked on December 13, 2017
  2. Math

    Drawing a least one king when you draw a card from a standard deck 8 times (replacing the card each time you draw, so there are always 52 cards in the deck) P(at least one king in 8 attempts)= [P(1 king + 2 kings + 3 kings + 4 kings]^8 = 1/52 + 2/52 + 3/52

    asked on November 7, 2015
  3. Physics

    A 15 kg block is on a ramp which is inclined at 20 degrees above the horizontal. It's connected by a string to a 19kg mass which hangs over the top edge of the ramp. With no frictional forces taken into account, what is the magnitude of the acceleration of

    asked on November 9, 2017
  4. cell biology

    What is the mass of 2.00 L of an intravenous glucose solution w/ a density of 1.15 g/ml?

    asked on February 25, 2011
  5. cellular solids

    Calculate the Young's modulus and compressive strength for: a) 5% dense aluminum regular hexagonal honeycomb, loaded in the out-of-plane direction, x3 b) 5% dense aluminum regular hexagonal honeycomb, loaded in the in-plane direction, x2 c) 5% dense

    asked on February 25, 2017
  6. Math

    The sides of a rectangle are in the ratio 2:5. The perimeter of the rectangle is 70cm. What is the Width of the the rectangle.

    asked on January 4, 2012
  7. Physics

    A squid can propel itself by taking water into its body and then expelling it. A 0.60 kg squid expels 0.30 kg of water with a velocity of 20 m/s [S]. What is the speed of the squid immediately after expelling the water?

    asked on December 13, 2017
  8. college physics

    A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.355 and he exerts a

    asked on November 21, 2011
  9. Math

    A play has two roles for men and four roles for women if five men and 12 women tryout for these parts,in how many different ways can the director choose people for the roles

    asked on March 8, 2017
  10. Physics

    Two gliders on an air track collide in a perfectly elastic collision. Glider A has mass 1.1 kg and is initially travelling at a velocity of 2.7 m/s [E]. It collides head-on with glider B with mass 2.4 kg, travelling at a velocity of 1.9 m/s [W]. Determine

    asked on December 13, 2017
  11. Math

    The equation V=1/3 Bh gives the volume V of a pyramid, where B is the area of the base and h is the height. Solve this equation for B. Please help me and show your work thanks

    asked on February 16, 2012
  12. Geometry

    A secant and a tangent to a circle intersect in a 42 degree angle. The two arcs of the circle intercepted by the secant and tangent have measures in a 7:3 ratio. Find the measure of the third arc. If someone could help me figure out how to do the

    asked on February 11, 2015
  13. Math

    What is the net price factor for trade discounts of 25/15/10? Answer: .57375 Just checking my homework answers

    asked on May 20, 2013
  14. Math(simple interest)

    A person borrows two equal sums of money at the time at 5% and 3.75% simple interest respectively & finds that if he repays the former sum a year before the latter the amount paid in each case is the same that is Rs.736. Find the total sum borrowed.

    asked on January 8, 2017
  15. Dudas

    John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xj = +9.0 m, while she is standing on the x axis at xb = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?

    asked on October 29, 2014
  16. algebra Please help

    .A toy rocket is shot vertically into the air from a launching pad 5 feel above the ground with an initial velocity of 72 feet per second. The height h, in feet, of the rocket above the ground as t seconds after launch is given by the function

    asked on June 2, 2015
  17. English

    just can't figure these sentences out. have to rewrite these sentences, correcting the problem of incorrect omission.? 1. A liberal arts background is excellent for such professions as lawyers and doctors. 2. American colleges consistently produce more

    asked on March 19, 2011
  18. math

    If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 0.05, what are the odds against an earthquake? multiple choice A) 20 : 1 B) 1 : 20 C) 18 : 1 D) 19 : 1 3

    asked on October 11, 2009
  19. MEC

    two charges repel each other with a force of 0.1N when they are 5cm apart. Find the forces between the same charges when they are 2cm and 8cm apart.

    asked on October 24, 2012
  20. forensic

    __________________ appear to match in one set of lighting conditions, but not in another. Dyes Pigments Metameric colors Simultaneous contrast colors Fluorescent fibers

    asked on July 21, 2017
  21. Chem

    Select sequence that corresponds to the following: CTCGA TTAAGG CTCGG AATTCC GAGCT GAGGAG

    asked on June 28, 2017
  22. algebra

    The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the distance from the light bulb is

    asked on May 15, 2015
  23. chemistry

    A solution contains 2 mEq/ml of KCL (Molecular weight 74.5). If a 20 ml ampule of this solution is diluted to 1 liter what is the percent strength of the resulting solution?

    asked on February 21, 2013
  24. maths help

    Please could you answer my question

    asked on January 3, 2018
  25. maths

    A sculpture needs to lift a piece of is a cuboid with dimensions 1m by 0.6m and 0.3m.marble has a density of 2.7. work out the mass.

    asked on January 3, 2018
  26. Business Math

    What amount must be paid to settle an invoice of $1200 dated Nov.28 , terms 3/10, n/30 if the invoice is paid on Dec. 3? I got $1164. Am I right? Thanks

    asked on April 15, 2011
  27. physics

    A ventilation fan has blades 0.25 m in radius rotating at 20rpm. What is the tangential speed of each blade tip? i don't understand how to do tangential speed.

    asked on January 11, 2011
  28. trig

    please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°

    asked on April 30, 2010
  29. Physics

    A tennis ball with mass 57 g is travelling at 25 m/s [S] when it is intercepted by a tennis racquet for 4.0 ms after which the ball travels at 32 m/s [N]. What is the impulse imparted by the tennis racquet?

    asked on December 13, 2017
  30. forensic science

    Why is the cross section of a fiber important? it is a distinctive trait of only natural fibers It is a distinctive trait of only synthetic polymer fibers it can vary significantly with the fiber it provides athe basis for the Beck line it determines the

    asked on July 20, 2017
  31. Physics

    A beam of particles have a measured life time of 1.5 x 10-8 s when traveling 2.0 x 108 m/s. What would their lifetime be if they were at rest? My Answer: tm= tp/√(1-(v2/c2)) (1.5*10-8) = tp/√(1-((2*108)2/(3*108)2)) (1.5*10-8) =

    asked on December 14, 2010
  32. Physics

    An electron is projected into a uniform electric field E = (1000 N/C)i with an initial velocity (2.00* 10^6m/s)i in the direction of the field. How far the electron travel before it is brought momentarily to rest?

    asked on January 26, 2020
  33. Calculus

    Why does 2ln6 - 2ln3 = ln4?

    asked on May 5, 2014
  34. Algebra: Help Please

    For the given function, compute the missing values in the following table. f(x) = 8x i got the negatives wrong, but I know how to solve for it. Is there a reason it is wrong? -3: -1/512 -2: -1/64 -1: -1/8 (^These were wrong, but I don't know how to solve

    asked on February 23, 2012
  35. English

    Choose the correct sentence pattern for the sentences below? 1) There is good reason to be thankful. 2) The President sent the ambassador an invitation to the meeting. 3) Snow skiing is a very exciting sport. 4) I hereby declare Tuesday Shakespeare Day.

    asked on March 31, 2011
  36. Math

    The perfect paving company charges $10 per square foot to install interlocking paving stones, as well as a $40 delivery fee. Determine the greatest area andrew can pave for $3500.

    asked on September 14, 2019
  37. math

    Find last years salary if after a 3% pay raise this years salary is $35,020

    asked on October 23, 2013
  38. chemistry... HELP !!!!!!!

    For the reaction 2Co^3+ (aq) + 2Cl^- (aq) ----> 2Co^2+ + Cl2 (g) E^o = 0.46 V (STANDARD cell potential) what is the cell potential at (25 deg C) if the concentrations are [Co^3+] = 0.651M , [Co^2+]= 0.846 M, and [Cl^-] = 0.636 M and the pressure of Cl2 is

    asked on November 5, 2012
  39. Statistics

    The probability that a radish seed will germinate is 0.6. Estimate the probability that of 130 randomly selected seeds, exactly 90 will germinate. Note: I keep getting the answer wrong.

    asked on July 20, 2012
  40. physics

    A dockworker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal surface, requires a 73 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 50 N is required to keep it moving

    asked on December 7, 2011
  41. statistics

    a study of the time spent shopping in a supermarket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be a) between 25 and 30

    asked on January 6, 2011
  42. algebra

    The circle has a circumference of 50.24. Using 3.14 to approximate pi​, find the value of x.       A circle with a radius labeled x plus 3. x + 3

    asked on May 7, 2018
  43. forensic

    Which of the following is true about RFLP? (multiple answer) the repeat strands are very short it analyzes only mitochondrial DNA it involves amplifying DNA restriction enzymes are used to cut the DNA at the ends of the repeat sites length polymorphism is

    asked on June 26, 2017
  44. forensic science

    Identification is the examination of chemical and physical properties of an object and using the results to categorize the object as a member of a group. Which of the following are examples of identification? Determination that hairs found on a bag are

    asked on May 31, 2017
  45. Chemistry

    E=hv E=energy h= Planck's constant =6.626 x 10^-34 v= frequency 1. What is the energy of light having a frequency of 2.28 x 10^12? ( I do have an answer for this but I'm not so sure about it.) 2.What is the energy of light with a wavelength of 2.18 x

    asked on December 3, 2014
  46. Physics test review

    A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the

    asked on November 8, 2014
  47. Pre-Calculus

    Let f(x) be the function 1/(x+9). Then the quotient [f(5+h)−f(5)]/h can be simplified to −1/(ah+b). What does a and b equal to? So I understand the overall concept, and did f(5+h) = 1/(14+h) and f(5) = 1/14. Then to subtract the two, you get the common

    asked on October 18, 2013
  48. math

    The derivative of f(x) = x^4/3 - x^5/5 attains its maximum value at x =

    asked on December 27, 2011
  49. 205

    The Death Penalty Should Not Be Abolished "Capital punishment produces a strong deterrent effect that saves lives." Muhlhausen argues that capital punishment should not be abandoned because it deters crimes, saves lives, and the majority of American

    asked on October 2, 2009
  50. forensic science

    "In fluorescence microscopy, the wavelength of the emitted light is __________that of the exciting radiation." Longer than Shorter than Equal to Either longer or shorter than Impossible to determine My answer is Longer than am I correct

    asked on June 8, 2017
  51. Business communication

    Reserving this property requires a $500 security deposit , which will be refunded unless there is damage to the property or evidence that there is damage to the property or evidence that there has been smoking in the cottage or a pet on the premises or if

    asked on January 30, 2017
  52. math

    Chuck has $6.00 and he spends 1/5 of his money on candy. How much does he have left?

    asked on October 19, 2015
  53. chemistry

    Hello, Please help me with this question! Which dilution would turn 10% (by mass) HCl solution into 0.100 M HCl solution? Density of 10% HCL = 1.08 g ml^-1

    asked on July 23, 2014
  54. Chemistry

    Which of the following combinations would require an electrolytic cell? coat aluminum onto iron coat iron onto lead coat copper onto tin coat calcium onto iron Please help.

    asked on May 3, 2012
  55. physics

    How much force is the air exerting on the front surface of the book with dimensions 19 x 27 cm. Assume atmospheric pressure equal to 100,000 Pa.

    asked on April 12, 2011
  56. physics

    To balance a 40.8-kg automobile tire and wheel, a mechanic must place a 41.7-g lead weight 25.0 cm from the center of the wheel. When the wheel is balanced, its center of mass is exactly at the center of the wheel. How far from the center of the wheel was

    asked on December 2, 2010
  57. Chemistry

    Sodium oxide, reacts with water to give NaOH. A) Write a balance equation? B)What is the pH of the solution prepared by allowing 1.55 g of Na2O to react with 500.0 ml of water? (assume there is no volume change) C) How many milliliters of 0.0100M HCL are

    asked on November 21, 2010
  58. English

    Need to label the verb wish A for action of L for Linking... 1. The koala bears have climbed the tree. Answer=A 2. The peacock seemed more beautiful than before. Answer=A 3. In the rain forest display at the zoo, the birds looked stange and exotic.

    asked on March 28, 2011
  59. Physics

    Three charges lie along the x-axis. The positive charge, q1 = 15 µC, is at x= 2.0 m, and The positive charge, q2 = 6.0 μC, is at the origin. At what point on the x-axis must a negative charge, q3 , be placed so that the net force acting on it is zero?

    asked on January 25, 2020
  60. math


    asked on April 12, 2018
  61. math

    Each number cube has 6 faces numbered 1-6. John tossed 2 number cubes several times and added the numbers each time. Sum of the number of cubes total tally number of times 2 1 ? 7 4 ?

    asked on December 11, 2017
  62. Math

    If you flip three fair coins, what is the probability that you'll get a head on the first flip, a tail on the second flip, and another head on the third flip?

    asked on April 15, 2017
  63. Psychology

    which of the following is a possible statistically significant outcome from a 2x2 factorial design. A. The other three choices are all possible outcomes . B. Two main effects and an interaction . C. no main effect for either factor but an interaction D.

    asked on April 11, 2017
  64. Algebra

    The focal length of the lens of the camera is 1/4 meter, and Sarah is 1/2 meter from the camera lens. What is the distance of the image from the lens?

    asked on January 28, 2016
  65. Chemistry

    A syrup is added to an empty container with a mass of 104.70 g . When 0.140 pint of syrup is added, the total mass of the container and syrup is 150.01 g . (1 qt = 2 pt) 0.140 pint= 66.2 mL 150.01g mass container and syrup 104.70g mass empty container

    asked on August 29, 2015
  66. algebra

    A private plane traveled from Seattle to the rugged wilderness at a average speed of 176 mph. on the return trip the average speed was 308 mph. if the total traveling time was 5 hours. How far is Seattle to the wilderness? please help

    asked on May 14, 2015
  67. Chemistry

    Dissolving solid CaCl2 H2O in a large volume of water is endothermic to the extent of 14.6 kj/mol. Also given: CaCl2(s)+6H2O(l)->CaCl2* 6H2O(s) delta H = -97.0 kj what is the heat of solution of anhydrous CaCl2 in a large volume of water?

    asked on March 17, 2014
  68. statistics

    Us travel data center survey of 1500 adults found that 42% of respondents stated that they favor historical sites. Find the 95% confidence interval of the true proportion of all adults who favor visiting historical sites.

    asked on March 25, 2013
  69. Physics HELP!!

    Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. The magnitude of each of the charges is 3.66 μC, and the lengths of the sides of a triangle are 2.15 cm.

    asked on October 17, 2012
  70. Gen Chem

    What are the net ionic equations for: 1. Potassium Fluoride and Ammonium Chloride and 2. Sodium Hydrogen Sulfite and Potassium Cyanide?

    asked on March 28, 2011
  71. math

    I need a picture to be 38mm X 50mm how do I figure this size in inches?

    asked on September 16, 2008
  72. statistics

    The Academy of Orthopedic Surgeons states that 80% of women wear shoes that are too small for their feet. A researcher wants to be 98% confident that this portion is within 3% of the true proportion. How large a sample is necessary?

    asked on April 2, 2008
  73. math

    A computer password is required to be 5 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 3 digits (numbers 0-9), where no repetition of any letter or digit is allowed?

    asked on May 23, 2020
  74. Physics

    A circuit consisting of three resistance 12ohm, 18ohm and 36ohm respectively joined in parallel, and connected in series with the fourth resistance. The whole circuit is supplied at 60volts and it is found that the power dissipated in the 12 resistance is

    asked on July 8, 2019
  75. MATH


    asked on October 28, 2017
  76. Chem

    Which statement is true when considering color in a fiber? the color is measured using an FTIR the color depends upon the lighting source the color is always a result of a pigment in all fibers there are very few color dyes that can be used for fibers none

    asked on July 21, 2017
  77. Research 1

    which of the following is a possible statistically significant outcome from a 2x2 factorial design. A. The other three choices are all possible outcomes . B. Two main effects and an interaction . C. no main effect for either factor but an interaction D.

    asked on April 11, 2017
  78. Chemistry

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

    asked on April 3, 2016
  79. FIN3373

    ST. Luke's Convalescent Center has $200,000 in surplus funds that it wishes to invest in marketable securities. If transaction costs to buy and sell the securities are $2,200 and the securities will be held for three months, what required annual yield must

    asked on March 27, 2016
  80. chemistry

    At 1500 °C, Kc = 5.67 for the reaction CH4(g) + H2O(g) CO(g) + 3H2(g) Calculated value of ΔG°1773 for the reaction at this temperature.

    asked on March 5, 2016
  81. Geometry

    2 sides of an equilateral triangle measure (y+10) units and (y^2-2) units. If the perimeter of the triangle is 21 units, what is the value of y? I was trying (y+(y+10) + (y^2-2)=21 got to y^2+2y+-13 and wasn't sure how to proceed. Or should I take a side

    asked on October 19, 2015

    a manufacture of brand A jeans has daily production costs of C =0.2x^2 -96x+12,095 where C is the total cost in dollars and x is the number of jeans produced. How many jeans should be produced each day in order to minimize costs? what is the minimum daily

    asked on June 7, 2015
  83. Psychology

    If science depends on observation of empirical data, how can social scientists study nonobservable phenomena, such as thought patterns or imagery?

    asked on January 16, 2015
  84. science

    How much latent heat is needed to completely melt 368 gram ice cube?

    asked on January 14, 2015
  85. Calculus

    Use the Laws of logarithms to rewrite the expression log(1000000x^19)in a form with no logarithm of a product, quotient or power. After rewriting we have log(1000000x^19)= A + Blog(x)? I know B = 19, but what's A?

    asked on May 18, 2014
  86. Chemistry

    What is the percent KCL by mass in a 3.00 molal solution?

    asked on March 17, 2014
  87. biostatistics

    Seventeen people has been exposed to a particular disease. Each one independently has a 40% chance of contracting the disease. A hospital has the capacity to handle 10 cases of the disease. What is the probability that the hospital's capacity will be

    asked on February 5, 2014
  88. Pre-Calculus

    Consider the chemical reaction aC2H6 + bCO2 + cH2O → dC2H5OH, where a, b, c, and d are unknown positive integers.? The reaction must be balanced; that is, the number of atoms of each element must be the same before and after the reaction. For example,

    asked on December 4, 2013
  89. Pre-Calculus

    The Hotel Ventor has 400 rooms. Currently the hotel is filled. The daily rental is $ 600 per room. For every $6 increase in rent the demand for rooms decreases by 7 rooms. Let x = the number of $ 6 increases that can be made. What should x be so as to

    asked on October 14, 2013
  90. statistics

    Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends

    asked on May 27, 2013

    A biased coin is tossed 5 times where p(t) = .6. determine the probability that if you have 2 tails, you have 3 tails.

    asked on May 25, 2013
  92. Math

    Natureland Garden Center buys lawn mowers that list for $679.95 less a 30% trade discount. What is the dollar amount of the trade discount? Answer: 203.99 What is the net price of each Natureland Garden Center lawn mower? Answer: 475.96 Just want to make

    asked on May 20, 2013
  93. Math

    Is this the correct numerical expression for 15 less than one-ninth of P? 15-1/9 P

    asked on May 1, 2013
  94. physics ..PLEASE HELP ASSIGN DUE SOON :(

    Three charges, q1=+45.9nC q2=+45.9nC and q3=+91.8nC are fixed at the corners of an equilateral triangle with a side length of 3.70cm. Find the magnitude of the electric force on q3.

    asked on October 19, 2012
  95. math

    Megan and Sam together take 12 minutes to wash a car. Washing the car by herself took Megan 21 minutes. How long would it take Sam to wash the car?

    asked on July 4, 2012
  96. chemistry

    what is the molecular geometry of niacin? C6H5NO2

    asked on March 2, 2012
  97. macroeconomics

    Suppose that there are three beachfront parcels of land available for sale in Asilomar and six people who would each like to purchase one parcel. Assume that the parcels are essentially identical and that the minimum selling price of each is $600,000. The

    asked on February 8, 2012
  98. Finance

    . Fill out the missing items on the Kim, Inc.’s balance sheet based on the ratios given below: Cash and marketable securities 800 current liabilities ? Accounts Receivables ? Long term Debt ? Inventory ? Equity ? Fixed Assets ? TOTAL ASSETS $8800 TOTAL

    asked on March 2, 2011
  99. English

    There is a host of reasons... or There are a host of reasons.... Which is correct?

    asked on November 20, 2010
  100. Calculus

    Solve for x where 12^x = (4)8^2x

    asked on April 20, 2010


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